22339 + Interview Questions in Biology in Class 11 Page 337 InterviewSolution

16801.	Question : How pseudo -annualringsare formed ?
Answer» Solution :ADDITIONAL GROWTH ringsare developedwithina yeardue toadverse naturalcalamitieslikedrought , frost, DEFOLIATION, flood , MECHANICAL injury and bioticfactors duringthe MIDDLEOF a growingseason ,whichresultsin the formationof more than ne annualring . Such rings are calledpseudo- or false- annual rings .

Discussion

16802.	Question : How primary meristem differs from secondary meristem ?
Answer» SOLUTION :

Discussion

16803.	Question : How polyteny condition is achieved?
Answer» SOLUTION :Polyteny is achieved by REPEATED replication of chromosomal DNA several times without NUCLEAR DIVISION and the DAUGHTER chromatids alighned side by side and do not separate (endomitosis).

Discussion

16804.	Question : How pits are formed?
Answer» Solution :In plant cell, at few REGIONS the SECONDARY wall layer is laid unevenly, WHEREAS the primary wall and middle lamellae and laid CONTINUOUSLY such regions are called pits.

Discussion

16805.	Question : How phyllotaxy helps the plants ?
Answer» Solution :PHYLLOTAXY is to avoid over crowding of LEAVES and expose the leaves MAXIMUM to the SUNLIGHT for photosynthesis.

Discussion

16806.	Question : How photosynthesis is carried out by cyanobacteria while they donot have chloroplasts ?
Answer» SOLUTION :They bear THYLAKOIDS suspended freely in the cytoplasm. Thylakoids are not ENCLOSED by MEMBRANES and bear bacterioch lorophyll to CARRY out photosynthesis.

Discussion

16807.	Question : How phoshorylase enzyme open the stomata in starch sugar interconversion theory ?
Answer» Solution :The discoveryof enzyme phosphorylase in GUARD cells by Hanes (1940) greatlysupports the STARCH-sugar interconversion THEORY. The enzymephosphorylasehydrolyses starch into sugar and high pH followedby endosmosis and the opening of stomata during light. The vice versatakes PLACE duringthe NIGHT.

Discussion

16808.	Question : How peat is obtained ? Write its economic value .
Answer» Solution :1. A large amount of dead thallus of Sphagnum GETS ACCUMULATED and compressed, hardened to form PEAT. 2. It is used as FUEL in commericial scale (Netherlands). 3. Nitrates brown DYE and tanning materials are derived from peat. 4. Sphagnum andpeat are also used inhorticulture as packing material because of their water holding capacity.

Discussion

16809.	Question :How pepsin is differing from trypsin?
Answer» It digests protein in acidic MEDIUM It digests protein in ALKALINE medium It digests CARBOHYDRATE in acidic medium It digests carbohydrate in alkaline medium SOLUTION :N/A

Discussion

16810.	Question : How peat is obtained? Write its economic value.
Answer» Solution :A large amount of dead thallus of Sphagmum gets accumulated and compressed, hardened to form PEAT. It is USED as fuel in COMMERCIAL scale (Netherlands). NITRATES, brown dye and tanning materials are DERIVED from peat. Sphagnum and peat are also used in horticulture as packing material because of their water holding capacity.

Discussion

16811.	Question : How one can think to explain transport in plants ?
Answer» Solution :How water REACHES the top of tall TREES ? Why substances move from one cell to the other ? Whether all substances move in a similar way ? Whether metabolic energy is required for moving substances ? Plants need to move molecules over very long distances, much more than animals do. There is no circulatory system available in plants but water taken up by the roots has to reach all parts of the plant. It reaches upto the very tip of the growing stem. The photosynthesis or food synthesised by the leaves have to be moved to all parts including the ROOT tips embedded deep inside the soil. Movement across SHORT distances WITHIN the cell, across the membranes and from cell to cell within the tissue has also to take place.

Discussion

16812.	Question : How much usable energy is available during oxidative combustion of 1 gm mole of glucose in the body?
Answer» 686000 CAL 304000 cal 277400 cal 686 cal SOLUTION :N//A

Discussion

16813.	Question : How much time does ventricular systole last? Which valves close during this phase?
Answer» SOLUTION :0.25 seconds. There is SHARP CLOSING of .. auriculo - VENTRICULAR valves.

Discussion

16814.	Question : How much pulmonary air is expired normally?
Answer» 0.7 0.2 0.25 0.32 Solution :0.32

Discussion

16815.	Question : How much per cent of glomerular filtrate is ultimately reabsorbed?
Answer» 25 50 90 99

Discussion

16816.	Question : How much per cent of water is absorbed in descending limb of loop of Henle?
Answer» 5 10 15 20

Discussion

16817.	Question : Howmuch per cent ofair isexpired ?
Answer» 0.07 0.32 0.25 0.2 Answer :B

Discussion

16818.	Question : How muchper cent of CO_(2) is expired?
Answer» 0.07 0.32 0.25 0.2 Answer :B

Discussion

16819.	Question : How much oxygen will be released to the tissues by blood on passing from lungs to tissues ?
Answer» `15` ML of `O_(2)//100` mL of blood `70` mL of `O_(2)//100` mL of blood `5` mL of `O_(2)//100` mL of blood `20` mL of `O_(2)//100` mL of blood Solution :N//A

Discussion

16820.	Question : How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
Answer» `1%` `10%` `40%` `90%` ANSWER :B

Discussion

16821.	Question : How much of glomerular filtrate is produced per day and how much of it is passed as urine?
Answer» SOLUTION :180 lirres. Only 1.5 LITRES.

Discussion

16822.	Question : How much of day length is need for the day-neutral plants to flower ?
Answer» Solution :PLANTS are INDIFFERENT to the LENGTH of the day and FLOWER in all SEASONS.

Discussion

16823.	Question : How much energy is stored during formation of ATP from ADP ?
Answer» SOLUTION :8.15 KCAL or 34 K J.

Discussion

16824.	Question : How does study of Mitochondrial DNA help in evolutionary studies ?
Answer» Solution :Mitochondrial DNA is USED to track and date recent EVOLUTIONARY time because it mutates 5 to 10 time faster than DNA in y the NUCLEUS.

Discussion

16825.	Question : How middle of 19^(th) century is an important reference to photosynthesis ?
Answer» Solution :By the middle of the nineteenth century the keys FEATURES of PLANT photosynthesis were known,that plants could use the light energy to make carbohydrates from `CO_(2)` and water. The empirical equation repsenting the total PROCESS of photosynthesis for oxygen evolving organisms was then understood as : `CO_(2)+H_(2)Ooverset("light")rarr[CH_(2)O]+O_(2)` Where `[CH_(2)O]` represented a carbohydrate (e.g., GLUCOSE, a six-carbon sugar). .

Discussion

16826.	Question : How milk is changed into curd, if a few drops of curd is added to it? What is the reason for its sourness ?
Answer» Solution :The change is BROUGHT by Lactobacilluslactis, a bacterium PRESENT in the curd.The sourness is due to the FORMATION of LACTIC acid.

Discussion

16827.	Question : How many vertebrae does giraffe have in the neck?
Answer» SOLUTION :7. CERVICAL VERTEBRAE.

Discussion

16828.	Question : How many vertbrae are present in adult backbone?
Answer» SOLUTION :26 VERTEBRAE.

Discussion

16829.	Question : How many types of skeletal muscles are present in the body?
Answer» SOLUTION :Two types. Red and WHITE MUSCLES.

Discussion

16830.	Question : How many types of proteins does membrane contain?
Answer» SOLUTION :TWO. (a) Periphral PROTEINS (B) INTRINSIC proteins

Discussion

16831.	Question : How many types of nephridia are found in earthworm bases on their location ?
Answer» SOLUTION :THREE TYPES

Discussion

16832.	Question : How many types of nephridia are found in earthworm based on their location ?
Answer» Solution :On the basis of LOCATION, there are 3 TYPES of nephridia : (1) Pharyngeal Nephridia (2) CUTANEOUS Nephridia and (3) INTEGUMENTARY Nephridia

Discussion

16833.	Question : How many types of muscles occur in the body of aVertebrate?
Answer» SOLUTION :THREE TYPES, STRIATED, non-striated, and CARDIAC.

Discussion

16834.	Question : How many times do nymphs moult to reach the adult formof cockroach?
Answer» SOLUTION :13 TIMES

Discussion

16835.	Question : How many times do nymphs moult to reach the adult form of cockroach ?
Answer» Solution :The NYMPH grows by moulting about 13 times to reach the ADULT form. The developm ent is paurometabous. Three phases are seen to obtain adult form e..g. egg, nymph and adult nymphs look very MUCH LIKE adults except UNDEVELOPED wings and male reproductive organs.

Discussion

16836.	Question : How many times a red blood corpuscle will have to pass through the heart in its journey from hepatic artery to the aorta?
Answer» TWO TIMES only once several times four times Solution : two times

Discussion

16837.	Question : How many thoracic vertebrates are there?
Answer» 7 12 5 4 Solution :12

Discussion

16838.	Question : How many teeth in man grows twice in life
Answer» 32 28 20 12 Answer :C

Discussion

16839.	Question : How many teeth appear twice during the life span of an individual?
Answer» 16 32 22 20 Answer :D

Discussion

16840.	Question :How many teeth appear twice during the life span of an individual?
Answer» 16 32 22 20 Solution :20

Discussion

16841.	Question : How many spoke like structure originates from central hub of centriole
Answer» 9 18 27 32 Answer :A

Discussion

16842.	Question : How many spermathecae found in cockroach ?
Answer» SOLUTION :ONE PAIR, PRESENT in 6th segment.

Discussion

16843.	Question : How many spermathecae are found in earthworm ?
Answer» Solution :Four pairs of spermathecae LOCATED in `6^th - 9^th` SEGMENTS (ONE pair in each segment).

Discussion

16844.	Question : How many species of plants and animals have been named so far?
Answer» SOLUTION :0.55 MILLION SPECIES of PLANTS and 1.25 million ANIMAL species,

Discussion

16845.	Question : How many species of marine algae are used as food ?
Answer» 17 7 70 71 Solution :70 SPECIES of marine ALGAE species are USED as FOOD

Discussion

16846.	Question : How many shoot apical meristems are likely to be present in a twig of a plant possessing, 4 branches and 26 leaves ? (A) 26 (B) 1 (C) 5 (D) 30
Answer» 26 1 5 30 Solution :5 Apical Meristematic TISSUE : It is always on thegrowing TIP. Plant having 4 branches and 26 leaves has 5 GROWING TIPS. (4 growing tip of branches and one tip of main AXIS of the plant)

Discussion

16847.	Question : How many segments are present in the abdomen of cockroach ?
Answer» SOLUTION :10 SEGMENTS.

Discussion

16848.	Question : How many segments are found in the thorax of cockroach?
Answer» SOLUTION :THREE SEGMENTS - PROTHORAX, MESOTHORAX andmetathorax.

Discussion

16849.	Question : How many reduction division are necessary for the formation of 200 grains of wheat
Answer» 250 150 200 360 Solution :For the FORMATION of 10 grams of WHEAT 100 pollen GRAINS and 100 megaspores are required . Each micropore mother cell produces 4 microspores (pollen grains) as a result of reduction division. Hene for the formation of 100 pollen grains. `(100)/(4)=25PMC` are needed and eachwill undergo one reduction division. Each megaspore motehr cell will produce 4 megaspores in which one become functional and other three degenerate. thus each MMC produces one megaspore. So 100 MMC are required to produce 100 megaspores. Total number of reduction divisions to produce 100 grains is 100+25=125

Discussion

16850.	Question : How many protons pass through complex V for synthesis of 2 molecules of ATP ?
Answer» SOLUTION :Two PAIRS of PROTONS (i.e., 4) pass through COMPLEX V for the synthesis of two molecules of ATP.

Discussion

Explore topic-wise InterviewSolutions in .

Question : How pseudo -annualringsare formed ?

Question : How primary meristem differs from secondary meristem ?

Question : How polyteny condition is achieved?

Question : How pits are formed?

Question : How phyllotaxy helps the plants ?

Question : How photosynthesis is carried out by cyanobacteria while they donot have chloroplasts ?

Question : How phoshorylase enzyme open the stomata in starch sugar interconversion theory ?

Question : How peat is obtained ? Write its economic value .

Question :How pepsin is differing from trypsin?

Question : How peat is obtained? Write its economic value.

Question : How one can think to explain transport in plants ?

Question : How much usable energy is available during oxidative combustion of 1 gm mole of glucose in the body?

Question : How much time does ventricular systole last? Which valves close during this phase?

Question : How much pulmonary air is expired normally?

Question : How much per cent of glomerular filtrate is ultimately reabsorbed?

Question : How much per cent of water is absorbed in descending limb of loop of Henle?

Question : Howmuch per cent ofair isexpired ?

Question : How muchper cent of CO_(2) is expired?

Question : How much oxygen will be released to the tissues by blood on passing from lungs to tissues ?

Question : How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?

Question : How much of glomerular filtrate is produced per day and how much of it is passed as urine?

Question : How much of day length is need for the day-neutral plants to flower ?

Question : How much energy is stored during formation of ATP from ADP ?

Question : How does study of Mitochondrial DNA help in evolutionary studies ?

Question : How middle of 19^(th) century is an important reference to photosynthesis ?

Question : How milk is changed into curd, if a few drops of curd is added to it? What is the reason for its sourness ?

Question : How many vertebrae does giraffe have in the neck?

Question : How many vertbrae are present in adult backbone?

Question : How many types of skeletal muscles are present in the body?

Question : How many types of proteins does membrane contain?

Question : How many types of nephridia are found in earthworm bases on their location ?

Question : How many types of nephridia are found in earthworm based on their location ?

Question : How many types of muscles occur in the body of aVertebrate?

Question : How many times do nymphs moult to reach the adult formof cockroach?

Question : How many times do nymphs moult to reach the adult form of cockroach ?

Question : How many times a red blood corpuscle will have to pass through the heart in its journey from hepatic artery to the aorta?

Question : How many thoracic vertebrates are there?

Question : How many teeth in man grows twice in life

Question : How many teeth appear twice during the life span of an individual?

Question :How many teeth appear twice during the life span of an individual?

Question : How many spoke like structure originates from central hub of centriole

Question : How many spermathecae found in cockroach ?

Question : How many spermathecae are found in earthworm ?

Question : How many species of plants and animals have been named so far?

Question : How many species of marine algae are used as food ?

Question : How many shoot apical meristems are likely to be present in a twig of a plant possessing, 4 branches and 26 leaves ? (A) 26 (B) 1 (C) 5 (D) 30

Question : How many segments are present in the abdomen of cockroach ?

Question : How many segments are found in the thorax of cockroach?

Question : How many reduction division are necessary for the formation of 200 grains of wheat

Question : How many protons pass through complex V for synthesis of 2 molecules of ATP ?