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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 4351. |
Question : Answer question numbers on the basis of your understanding of the following paragraph and the related studied concepts : In tissue culture, new plants are grown by removing tissue or separating cells from the growing tip of a plant. The cells are then placed in an artificial medium where they divide rapidly to form a small group of cells or callus. The callus is transferred to another medium containing hormones for growth and differentiation. The plantlets are then placed in the soil so that they can grow into mature plants. Using tissue culture, many plants can be grown from one parent in disease-free conditions. This technique is commonly used for ornamental plants. From step B C, there is cell differentiation involved, which has led to formation of a complete plantlet ? Explain how is this achieved. |
| Answer» Solution :From step B `to C` the undifferentiated MASS of CELLS has undergone differentiation to form a plant. This is achieved by adding plant hormones to the nutrient medium. | |
| 4352. |
Question : Answer question numbers on the basis of your understanding of the following paragraph and the related studied concepts : In tissue culture, new plants are grown by removing tissue or separating cells from the growing tip of a plant. The cells are then placed in an artificial medium where they divide rapidly to form a small group of cells or callus. The callus is transferred to another medium containing hormones for growth and differentiation. The plantlets are then placed in the soil so that they can grow into mature plants. Using tissue culture, many plants can be grown from one parent in disease-free conditions. This technique is commonly used for ornamental plants. In step B, what is callus ? |
| Answer» SOLUTION :Callus is UNDIFFERENTIATED MASS of cells which have divided and grown in numbers from the EXPLANT. | |
| 4353. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and the related studied concepts : Different species use very different strategies for this. Some rely entirely on environmental cues. Thus, in some animals like a few reptiles, the temperature at which fertilised eggs are kept determines whether the animals developing in the eggs will be male or female. In other animals, such as snails, individuals can change sex, indicating that sex is not genetically determined. However, in human beings, the sex of the individual is largely genetically determined. In other words, the genes inherited from our parents decide whether we will be boys or girls. But so far, we have assumed that similar gene sets are inherited from both parents. How is sex determined in human beings ? |
| Answer» SOLUTION :In human beings, SEX is determined by the CHROMOSOMES of sperms as they CARRY any one of the TWO different types of sex chromosomes. | |
| 4354. |
Question : Answer question numbers on the basis of your understanding of the following paragraph and the related studied concepts : In tissue culture, new plants are grown by removing tissue or separating cells from the growing tip of a plant. The cells are then placed in an artificial medium where they divide rapidly to form a small group of cells or callus. The callus is transferred to another medium containing hormones for growth and differentiation. The plantlets are then placed in the soil so that they can grow into mature plants. Using tissue culture, many plants can be grown from one parent in disease-free conditions. This technique is commonly used for ornamental plants. In step A, what is the explant ? |
| Answer» SOLUTION :EXPLANT is a SMALL PIECE of tissue from the parent PLANT generally the meristematic tissue. | |
| 4355. |
Question : Answer question numbers (a) - (d) on the basis ofyour understading of the following paragraph and the related studied concepts :The excretory system of human beings includes a pair of kidneys, a pair of ureters, a urinary bladder and a urethra. Kidneysare located in the abdomen, one on either side of the backbone. Urine produced in thekidneys passesthrough the ureters intothe ureters into urinary bladder where it is stored until it is released through the urethra.(a)Between Renal artery and Vera cava (Renal Vein) whichone carriers more impurities ?(b)How'sthe expulsion of urine regulated ?(c)Howfrequently is urine produced and sent into the urinary bladder ?(d)How is urine production is human body differentfrom dialysis, though both the procedurers are helping in removal of impurities from the body ? |
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Answer» Solution :(a) Renal artery carriers more impurities which get filtered out in each kidney through beings NEPHRONS. (b) The urinary bladder stores urineuntil the feeling. of being FULL, then it expels it out by OPENING of the sphincter. It is under neural regulation. (c)The urineis formed continuously as the blood is continuously being purified in the kidenys and hence is beingsent to the bladder continuously. Inside our body, the molecules are filtered outbased on their solubility and size. Hence, much water is also filtered . HOWEVER, most nutrients and 90% of water is reabsorbed back into the blood so that only the impurities and wastes, dissolved in water are exerted out from the body. However in dialysisit is only the impurities and wastes that are REMOVED into the dialysing fluid . There is no reabsorption. |
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| 4356. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and the related studied concepts : Different species use very different strategies for this. Some rely entirely on environmental cues. Thus, in some animals like a few reptiles, the temperature at which fertilised eggs are kept determines whether the animals developing in the eggs will be male or female. In other animals, such as snails, individuals can change sex, indicating that sex is not genetically determined. However, in human beings, the sex of the individual is largely genetically determined. In other words, the genes inherited from our parents decide whether we will be boys or girls. But so far, we have assumed that similar gene sets are inherited from both parents. Do snails also have two morphologically different individuals representing two sexes? |
| Answer» SOLUTION :No, in SNAILS, an INDIVIDUALS can CHANGE SEX. | |
| 4357. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and the related studied concepts : Different species use very different strategies for this. Some rely entirely on environmental cues. Thus, in some animals like a few reptiles, the temperature at which fertilised eggs are kept determines whether the animals developing in the eggs will be male or female. In other animals, such as snails, individuals can change sex, indicating that sex is not genetically determined. However, in human beings, the sex of the individual is largely genetically determined. In other words, the genes inherited from our parents decide whether we will be boys or girls. But so far, we have assumed that similar gene sets are inherited from both parents. How is the sex of a newbom individual determined in garden lizard ? |
| Answer» Solution :In garden LIZARD, the temperature determines WHETHER the developing organisms is MALE or female low temperature TRIGGERS development of female lizard. | |
| 4358. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and the related studied concepts : Cellular DNA is the information source for making proteins in the cell. A section of DNA that provides information for one protein is called the gene for that protein. Let us take the example of tallness as a characteristic. We know that plants have hormones that can trigger growth. Plant height can thus depend on the amount of a particular plant hormone. The amount of the plant hormone made will depend on the efficiency of the process for making it. Consider now an enzyme that is important for this process. If this enzyme works efficiently, a lot of hormone will be made, and the plant will be tall. If the gene for that enzyme has an alteration that makes the enzyme less efficient, the amount of hormone will be less, and the plant will be short. Thus, genes control characteristics or traits. How many genes are present for each character ? |
| Answer» Solution :Generally, there is a PAIR of GENE for each CHARACTER one each of which is inherited by a parent. | |
| 4359. |
Question : Answer question numbers (a) - (d) on the basis of yourunderstandingof thefollowing paragraph and the relatedstudied concepts :ATPis theenergy currencyfor mostcellular processes. Theenergy relased during the processof respiration is usedto makean ATPmoleculefromADP andinorganic phosphate.ADP +(P)overset("Energy")to ADP ~ (P)=ATP (P) : PhosphateEndothermic processesin the cell then use this ATPto drive the reactions. When terminalphosphate linkage in ATPis broken usingwater.The energy equivalentto 30.5 kJ/mol is released. Think of how a battery can provide energy for many differentkinds of uses. Itcan be usedto obtain mechanical energy , lightenergy, electrical energy and so on. Similarly, ATPcan be usedin thecells for the contraction of muscles, protein synthesis, conduction of nervous impulses andmany otheractivities.(a)How does ATP act as energy currencyof the cell ?(b) Whichis thesite of synthesisof ATP in a cell? (c)Isit same in prokaryotes and eukaryotes ?(d)From where is energy released duringrespiration ? |
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Answer» <P> Solution :(a)Thethird phosphate groupwhen DISSOCIATES from ATP, releaseslarge amountof energy.`(A) - P ~P` (b)It is mainlysynthesised in mitochondriahence, they are also called "Power house of the cell". (c)Inprokaryotes, ATP is synthesised in cytoplasm only while in eukaryotes its synthesised in cytoplasm aswell as inmitochondria. (d)Duringrespiration, energy is released mainly from breakdownof glucose. But in specialcircumstances, also frombreakdown of AMINO acids, fatty acidsand GLYCEROL. |
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| 4360. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and the related studied concepts : Different species use very different strategies for this. Some rely entirely on environmental cues. Thus, in some animals like a few reptiles, the temperature at which fertilised eggs are kept determines whether the animals developing in the eggs will be male or female. In other animals, such as snails, individuals can change sex, indicating that sex is not genetically determined. However, in human beings, the sex of the individual is largely genetically determined. In other words, the genes inherited from our parents decide whether we will be boys or girls. But so far, we have assumed that similar gene sets are inherited from both parents. Sexual reproduction involves participation of individuals of two sexes ? Explain. |
| Answer» Solution :Sexual reproduction involves PARTICIPATION of INDIVIDUALS of two different sexes as the SPECIAL cells called GAMETES from either sex fuse to give RISE to the progeny. | |
| 4361. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and the related studied concepts : Cellular DNA is the information source for making proteins in the cell. A section of DNA that provides information for one protein is called the gene for that protein. Let us take the example of tallness as a characteristic. We know that plants have hormones that can trigger growth. Plant height can thus depend on the amount of a particular plant hormone. The amount of the plant hormone made will depend on the efficiency of the process for making it. Consider now an enzyme that is important for this process. If this enzyme works efficiently, a lot of hormone will be made, and the plant will be tall. If the gene for that enzyme has an alteration that makes the enzyme less efficient, the amount of hormone will be less, and the plant will be short. Thus, genes control characteristics or traits. Discuss the correlation between a gene and its physical expression. |
| Answer» Solution :The correlation between a GENE and its impact on the organism is that it is the gene that is RESPONSIBLE for synthesis of a protein which MAY be an ENZYME, hormone or a structural componernt, which is responsible for MANIFESTING as physical expression. | |
| 4362. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and the related studied concepts : Cellular DNA is the information source for making proteins in the cell. A section of DNA that provides information for one protein is called the gene for that protein. Let us take the example of tallness as a characteristic. We know that plants have hormones that can trigger growth. Plant height can thus depend on the amount of a particular plant hormone. The amount of the plant hormone made will depend on the efficiency of the process for making it. Consider now an enzyme that is important for this process. If this enzyme works efficiently, a lot of hormone will be made, and the plant will be tall. If the gene for that enzyme has an alteration that makes the enzyme less efficient, the amount of hormone will be less, and the plant will be short. Thus, genes control characteristics or traits. Based on the information given, is there one or more genes on a chromosome ? |
| Answer» SOLUTION :Since a GENE is a SECTION of DNA HENCE there are more than one gene on a CHROMOSOME. | |
| 4363. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and the related studied concepts : Cellular DNA is the information source for making proteins in the cell. A section of DNA that provides information for one protein is called the gene for that protein. Let us take the example of tallness as a characteristic. We know that plants have hormones that can trigger growth. Plant height can thus depend on the amount of a particular plant hormone. The amount of the plant hormone made will depend on the efficiency of the process for making it. Consider now an enzyme that is important for this process. If this enzyme works efficiently, a lot of hormone will be made, and the plant will be tall. If the gene for that enzyme has an alteration that makes the enzyme less efficient, the amount of hormone will be less, and the plant will be short. Thus, genes control characteristics or traits. Based on the given passage, define a gene. |
| Answer» Solution :A GENE is a section of DNA on the chromosome, having COMPLETE information for ONE protein. | |
| 4364. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and the related studied concepts :Thegiven diagram shows a unicellular organismcapturingits food .(a) What type of nutrition is shown in the diagram ?(b)Giveanother function of thespecialised extension shown in 'b'(c)Howis nutrition shownin the given diagram differentfrom that in Paramecium, which is also unicellular ?(d)Give appropriate term for taking is solidfood by the given organism ? |
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Answer» Solution :(a) Holozoic (B).b.is pseudopodiawhichnot only helps in CAPTURING and engulfingfood butalso helps in movement in AMOEBA. (c)Amoeba takes in foodwiththe helpof PSEUDOPODIA, formed in any direction whereasparamecium takesin FOOD a particularopening, withthe helpof cilia. (d)Phagocytosis . |
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| 4365. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of the following paragraphand the related studied concepts :The separation of the rightside and theleft side of the heart is useful to keep oxygenated and de-oxygenated blook from mixing. Suchseparation alllows a highly efficientsupply of oxygen to the body. Thisis useful in animalsthathave high energy needs, suchas birds and mammals, whichconstantly use energy to maintain their body temperature. In animals that do not use energy for thispurpose, the body temperaturedependson thetemperature in the environment . Suchanimals, likeamphibians or many reptiles have three- chambreredhearts, and tolerate somemixing of theoxygenated and de-oxygenated blood streams. Fishes, on the other hand, have only two chambers to theirhearts, and the blood is pumped to thegills, isoxygenated there, and passes directly to therest of the body.(a)What does the give diagram depict ?(b)In which type of organismswould you find this type of transportation ?(c)Explain why some animals like fishes have only two chambered heart ?(d)From this study what can you deduct aboutevolution ? |
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Answer» Solution :(a)The given diagram depicts TRANSPORTATION and exchange of respiratory geses i.e. `O_(2) and CO_(2)`from the heart to various body parts, includinglungs. (b)Thisis showing double circulation, which is seen in warm blooded animals. (c)Fishes have only twochambered heart wherethe oxygenated and de-oxygenated blood gets mixed up. It is thismixed blood which is transported throughthe body. This is known as single circulation. (d)From evolutionary point of view it showthatas animals evolved, they came to posses a pump forcirculatingtheriblood to different parts. Thispump likeorgan i.e., heartinitially could not SEGREGATE oxygenated and de-oxygenated bloodand hence such animals could notregulatetheirdody TEMPERATURE while it became 3 and then 4 chambered where theanimalscould regulatetheirbodytemperature, DUE tohigheravailability of energy. |
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| 4366. |
Question : Answer question numbers (a) - (d) on the basisof your understanding of the followingparagraph and the related studied concepts :•Takesome freshly prepared lime water in a test tube.•Blowair through thislime water .•Note how long it takesfor the lime water to turn milky.•Use a syringe or pichkari to pass air through some fresh lime water taken in anothertest tube.(a)What change would you expect in figure 'a'and 'b' ?(b)Why do you observe the change in 'b'?(c)What is the source of thiscomponent ?(d)State the significanceof thisactivity. |
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Answer» Solution :(a)Thetest significance ofthisactivity. (b)Limewaterturnsmilkywhen `CO_(2)`reaches it and forming `CaCO_(3)`whichis WHITISH in colour. (c)`CO_(2)`is REACHING limewater through the exhaled AIR . (d)Thisactivity signifiesthatwe exhale`CO_(2)`when we breathe. |
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| 4367. |
Question : Answer question numbers (a) -(d) on the basis of your understanding of the followingparagraph andthe related studied concepts :If youcarefully observe a cross-section of a leaf underthe microscope shown in Fig. 6.4, you will notice that some cells containgreendots. These green dots are cell organelles called chloroplasts whichcontain chlorophyll.(a)What is the role of these dots thatcontain chlorophyll.(b)What is the main difference you see between upper and lower epidermis ?(c)What is theroleof air spaces ?(d)Name the layer of cells that contain chloroplasts. |
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Answer» Solution :(a)These doescontaining chlorophyll are the sites for capturing sunlightresulting in its activation. (b)The main difference between the TWO epidermis is that thetwo epidermis is that the UPPER epidermisis continuouswhile lowerepidermis is discontinuousdue to presence ofstomatawhichallowgaseousexchange. (C) Air spaces just behind the lower epidermis contains `CO_(2)`from outside and removes `H_(2) O`frominside the cells. (d)Mesophyll layer is parenchymatous cells whichcontainchloroplasts and aremainsites ofphotosynthesis. |
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| 4368. |
Question : Answer question numbers (a) - (d) on the basis of your understanding of thefolllowing paragraph and the related studied concepts :The digested food is taken up by the walls of theintestine. The inner liningof the small intestinehas numerousfinger-likeprojections called villiwhich increase the surfaceareafor absorption. Thevilli are richly supplied with blood vesselswhichtake the obsorbed food to each and everycell of thebody, where it is utilisedfor obtainingenergy, building up new tissues and the repairof old tissues .(a)Which step of nutrition in man is taking place in the small intestine?(b) Whatis the roleof villi ? (c)Where does utilisation/assimilation of digested foot take place ? (d)Where else will you find villi ? |
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Answer» SOLUTION :(a) ABSORPTION. (b) They INCREASE the surface areaformaximum absorption of digested food. (c)In all the BODY cells. (d)Somevilli are alsopresent in large intestine. |
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| 4369. |
Question : Answer question numbers (a) - (d)on the basis of you understading of the followingparagraph and the related studied concepts :Following is the chart showingbloodpressureand pulse rate of a 30 years oldperson, duringthe day. Studythe table and answerthe questions thatfollow :{:("Time","Blood Pressure (mm of Hg)","Pulse rate"),(6 am ,""110 7//0,68),(9 an ,""120 //70,72),(12 " noon ",""160//90,90),(3 " noon",""120//70,72),(6 p m ,""120//70,72),(9 p m ,""120 //70,70):} (a) Give your opinion on the readings. (b) What is the cause behind suddenhike in BP and pulse rate ?(c)Explain its action.(d)What explainsthe reading at 3 pm ? |
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Answer» Solution :(a)Thisperson.s normal BP and pulse rate is 120/70 and 72respectively. At 12 noon there may have been some emergency situation which resulted in increased BP and HEART rate. (b)Hormonereleased by adrenal gland i.e., adrenaline is released under stress or any emergency like situation. Thishormone prepares us toface such situationsand hence is released only at the time of an emergency. (c)Adrenaline is secreted directly intothe blood and CARRIED to different PARTS of the body . THETARGET organs or the specifictissues on which it acts include the heart. As a result, the heart beats faster, resultingin supply of more oxygen to our muscles. The bloodto the digestive system and skin is reduced due to contraction of muscles around small arteries in theseorgans . This diverts the blood to ourskeletal muscles. The breathing rate ALSO increases becauseof the contractions of the diaphragm and the rib muscles. Once the emergency situation is deal, with the adrenaline secretion stops and the body returns to normal. Hence, the heart rate and BP also gets normalised. |
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| 4370. |
Question : Answer question numbers (a) - (d)on the basis of you understading of the followingparagraph and the related studied concepts :Plant transport systemswill move energy stores from leaves and raw materials from roots. These two pathways are constructed as independently organised conducting tubes . Onethe xylem moves water and minerals obtained from the soil. The other, phloem transports products of photosynthesisfrom the leaves wherethey are synthesised to other parts of the plant. Unliketransportin xylem whichcan be largely explained by simple physical forces, thetranslocation in phloem is achieved by utilising energy.(a)Why is the need for transport system in plants ?(b) What are the components of tissues involved in transportation in plants ?(c)In what form is thephotosynthetic produce transported and stored ?(d)Though transport in xylem is mainly due to physical forces, translocation in phloem uses energy. Explain . |
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Answer» Solution :(a)Thetransportsystemsin plants help in taking water , mineralsand food to differentparts of the plant. (b)For TRANSPORTATION of water andminerals, xylem is involved whichis made of xylem tracheids, xylem vessels, xylemfibres and xylem parenchyma of whichonly xylem parenchyma is living. Fortranslocation of food, phloem isinvolved which is made of phloemparenchyma, companion cells,sieve tubes and phloemfibresof which the lest one is dead. (c)Photosynthetic PRODUCE is translocated in the form of sucrose and stored in the form of STARCH. (d)Since, duringtranslocation its the solute thatis moved i.e., sucrose HENCE, it REQUIRES energy.Thusphloemis mainlymade up of livingcells unlikexylem wherephysical forces are involved in taking up waterand minerals, and hencegenerally dead. |
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| 4371. |
Question : Annelids are abundant and successful organ isms characterised accurately by all of the following except |
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Answer» a HYDROSTATIC skeleton |
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| 4372. |
Question : Animals that fed on both producer as well as consumer trophic level are called.... |
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Answer» HERBIVORES |
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| 4373. |
Question : Animals and plants from grassland ecosystem? |
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Answer» Solution :Animals : Wolf, rabbit, honeybee, insect, RAT, BUTTERFLY, snake, FROG, MONGOOSE, fox, deer, stag. Plants : Grass, shrubs. |
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| 4374. |
Question : Animals and plants from pond ecosystem? |
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Answer» Solution :ANIMALS :FISH, TORTOISE, duck,kingfisher,heron, FROG, snake, crocodile. Plants : Algae, aquatic plants. |
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| 4375. |
Question : Animals and plants from jungle ecosystem? |
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Answer» Solution :Animals:TIGER, LION, leopard,moth, mongoose, deer, bison, crow, stage, shekhru. PLANTS : Teak, berry, jamun, acacia, BANYAN. |
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| 4376. |
Question : Animal with unsegmented coelom, superficial radial symmetry and bilateral symmetrical larva belongs to |
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Answer» ARTHROPODA |
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| 4377. |
Question : Animal specie living in chronic shortage of water generally excrete uric acid as the principal nitrogenous waste product because |
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Answer» uric ACID can be stored in the body for long periods |
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| 4378. |
Question : Angiosperms can be differentiated from gym nosperms by |
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Answer» production of SEEDS WITHIN the ovary |
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| 4379. |
Question : Anemophilousflowershave _____. |
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Answer» SESSILE stigma |
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| 4380. |
Question : Androgens are secreted from |
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Answer» OVARY and placenta |
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| 4381. |
Question : ____ and____ increases the surfaces area of cerebrum. |
| Answer» SOLUTION :GYRI and SULCI | |
| 4382. |
Question : Analyse the statement given below and answer the questions. "When pathogens enter, body temperature raises. It is a defense mechanism of the body". Raise in body temperature is considered as a defense mechanism. Why ? |
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| 4383. |
Question : Analyse the statement given below and answer the questions. "When pathogens enter, body temperature raises. It is a defense mechanism of the body". Why does body temperature raise when pathogens enter the body ? |
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| 4384. |
Question : Analyse the statement given below and answer the questions. "When pathogens enter, body temperature raises. It is a defense mechanism of the body". What is the normal temperature of the human body ? |
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| 4385. |
Question : Analyse the news and answer the questions. Identify the pathogen of disease indicated in thenews. |
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| 4386. |
Question : Analyse the illustration of DNA nucleotides and se¬lect the correctly labelled one. |
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Answer» X-phosphate, Y-ribose SUGAR, Z-adenine |
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| 4387. |
Question : Analyse the illustration and answer the questions. How do Cancer cells differ from normal cells? |
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| 4388. |
Question : Analyse the illustration and answer the questions. Complete (iii) and (iv). |
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| 4389. |
Question : Analyse the illustration and answer the questions. Which process does the illustration indicate? |
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| 4390. |
Question : Analyse the illustration and answer the following questions: Write the names of (i) and (ii). |
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| 4391. |
Question : Analyse the given symptoms and identify the disease. Low metabolic rate |
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| 4392. |
Question : Analyse the given symptoms and identify the disease. Inflammation in tissues |
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| 4393. |
Question : Analyse the given symptoms and identify the disease. Hypertension |
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| 4394. |
Question : Analyse the given model and complete the illustration. |
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| 4395. |
Question : Analyse the given illustration and complete (i) and (ii) suitably Hint (i) Enzyme (ii) Ion |
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| 4396. |
Question : Analogous organs have a |
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Answer» COMMON EMBRYONIC origin but perform different functions |
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| 4397. |
Question : Anaerobic process |
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Answer» TAKES place in yeast during fermentation |
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| 4398. |
Question : Anaemia is related to |
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Answer» IODINE deficiency |
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| 4399. |
Question : An organism with two unlike genes of a trait is called : |
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Answer» HOMOZYGOUS |
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| 4400. |
Question : An organism with two identical alleles of a gene in a cell is called |
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Answer» HOMOZYGOUS |
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