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4501.

Question : Advanced agricultural practice leads to excessive use of fertilisers, pesticides and irrigation. Use of such agricultural products can cause some health issues in human beings. Uncontroled use of chemicals can also cause adverse effect on our environment. How is soil affected by this phenomena?

Answer»

SOLUTION :Soil is affected in following concern :
( i )Pesticides are TOXIC that accumulate in soil.
( ii ) SALINITY of soil increases.
(iii) Soil BECOMES non-fertile.
Discussion
4502.

Question : Adult sporopyte and gametophyte are both free living in a

Answer»

fungus
moss
ferns
conifer

Answer :C
Discussion
4503.

Question : Advanced agricultural practice leads to excessive use of fertilisers, pesticides and irrigation. Use of such agricultural products can cause some health issues in human beings. Uncontroled use of chemicals can also cause adverse effect on our environment. Name the ecological process involved in the above case.

Answer»

SOLUTION :BIOLOGICAL MAGNIFICATION.
Discussion
4504.

Question : (a)Draw a neat diagram of a flower showing its vapours parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel. (b) What name is given to (i) all the petals of a flower, and (ii) all the sepals of a flower ? (c) What are (i) stamen, and (ii) carpel, in a flower ? (d) WHat is the other name of carpel of a flower? (e) What is the name of yellow powdery substance present in the anther of a flower ?

Answer»


SOLUTION :N//A
Discussion
4505.

Question : Adenine always links with Guanine with three hydrogen bonds and cytosine always links with thymine with two hydrogen bonds.

Answer»

Solution :ADENINE ALWAYS LINKS with THYMINE with two HYDROGEN bonds. Cytosine always links with Guanine with three hydrogen bonds.
Discussion
4506.

Question : Adaptation to low temperature and freezing in animals occurs due to the production of

Answer»

PROLINE
analine
antifreeze proteins
antifreeze MONOSACCHARIDES

ANSWER :C
Discussion
4507.

Question : Activity-2 You must say the colour of the word but not the name of the word.

Answer»

Solution :`{:("BLUE","RED","YELLOW","ORANGE"),("GREEN","BLUE","PURPLE","RED"),("PURPLE","YELLOW","RED","BLUE"):}`
Student.s ACTIVITY
Discussion
4508.

Question : Activity-3 Use the letter and number code to decode the given information:

Answer»

SOLUTION :
Discussion
4509.

Question : Activity-1 Create a model of a neuron using clay or beads.

Answer»

SOLUTION :Student.s ACTIVITY
Discussion
4510.

Question : Active transport involves

Answer»

movement of MOLECULES from LOWER to higher CONCENTRATION
expenditure of energy
it is an UPHILL task
all of the above

SOLUTION :movement of molecules from lower to higher concentration
Discussion
4511.

Question : Acid rain is caused due to increase in concentration of

Answer»

`SO_(2) and NO_(2)`
`CO and CO_(2)`
CO and SO
Ozone and DUST

ANSWER :A
Discussion
4512.

Question : Acid rain is caused due to increase in concentra- tion of

Answer»

`SO_(2) and NO_(2)`
`CO and CO_(2)`
`CO and SO_(2)`
OZONE and DUST

ANSWER :A
Discussion
4513.

Question : Accumulation of urea in blood is called,

Answer»

Uremia
Renal septic
Oedema
Tubulonephritis

Answer :A
Discussion
4514.

Question : According to the evolutionary theory, formation of a new species is generally due to :

Answer»

sudden creation by NATURE
accumulation of variations over several generations
clones formed during asexual reproduction
movement of INDIVIDUALS from ONE HABITAT to another.

Answer :B
Discussion
4515.

Question : According to the evolutionary theory, formation of anew species is generally due to

Answer»

sudden creation by nature
accumulation of variations over SEVERAL generations
clones formed during asexual REPRODUCTION
movement of INDIVIDUALS from one HABITAT to another.

Answer :B
Discussion
4516.

Question : According to the accepted concept of hormone action, if receptor molecules are removed from target organs

Answer»

the target ORGAN will continue to respond to the hormone WITHOUT any difference
the target organ will continue to respond to the hormone but will REQUIRE HIGHER concentration
the target organs will not respond to the hormone
the target organ will continue to respond to the hormone but in the opposite way

Answer :C
Discussion
4517.

Question : According to scientists, the Big Bang occurred approximately_______years ago.

Answer»

100 MILLION
100 thousand
1 billion
15 billion

Answer :D
Discussion
4518.

Question : According to Mendel's experiment, the tall plants in F_(1) generation were exactly the same as the tall plants of the parent generation ? Why ?

Answer»

Solution :No, because PLANTS in `F_(1)` generation were GENETICALLY Tt (heterozygous) whereas plants of parent generation were TT (HOMOZYGOUS DOMINANT).
Discussion
4519.

Question : According to Mendal ,alletes have the following character

Answer»

PAIR of genes
Responsible for character
Production of gametes
Recessive factors

Answer :A
Discussion
4520.

Question : According to Mendel, the trait expressed in F1 is dominant.

Answer»

Solution :True - In heterozygous CONDITIONS, which ever TRAIT is EXPRESSED, is dominant.
Discussion
4521.

Question : According to fluid -mosaic model the correct sequence of plasmalemma is

Answer»

L-P-P-L
P-P-L-L
P-P-L-L
L-P-L-P

Solution :N/A
Discussion
4522.

Question : According to evolutionary origin of eye- structure, arrange following in correct sequence : Eye-like the wings, Insect-eye, Human-eye, Eyespots

Answer»

SOLUTION :`"EYESPOTS"RARR"Insect-eye"rarr"Eye-like the WINGS"rarr"Human-eye"`
Discussion
4523.

Question : According to Darwin the power of reproduction is ___ and this will lead to ___ for food and shelter.

Answer»

SOLUTION :ENORMOUS
Discussion
4524.

Question : Accessory sex organ in man include the Gonads. (Testes in males and Ovaries in female).

Answer»


Solution :CORRECT STATEMENT: Primary sex ORGAN in man include the Gonads. (Testes in MALES and Ovaries in female)
Discussion
4525.

Question : Absorption of digested food occurs throughoutthe alimentary canal

Answer»

SOLUTION :False - Absorption of digested food takes PLACE in SMALL INTESTINE as villi are PRESENT there.
Discussion
4526.

Question : Absorption of amino acids in humans occurs in,

Answer»

ileum
duodenum
caecunm
all the above

Answer :B
Discussion
4527.

Question : Abscisic acid controls

Answer»

shoot elongation
CELL elongation and cell wall FORMATION
cell DIVISION
LEAF FALL and dormancy

Answer :D
Discussion
4528.

Question : About how much saliva does a person produce each day?

Answer»

100 ML
250 ml
500 ml
1500 ml 

ANSWER :D
Discussion
4529.

Question : About how much blood is in the circulatory system of an average person?

Answer»

1 litre
2 LITRES
5 litres
10 litres 

ANSWER :C
Discussion
4530.

Question : About how many nephrons are there in each kidney of a human?

Answer»

16
200
1000
1000000

Answer :D
Discussion
4531.

Question :A major percentage (97%) of O_(2) is transported by RBCs in the blood. How does the remaining percentage (3%) of O_(2) transported?

Answer»

SOLUTION :In SIMPLE solution FORM through PLASMA.
Discussion
4532.

Question : About 70 per cent of our energy requirements should be met by

Answer»

vitamins
fats
proteins
carbohydrates

Answer :D
Discussion
4533.

Question : About 30% of CO_(2) is transported as

Answer»

CARBAMINO compounds
bicarbonates of NA and K 
carboxyhaemoglobin
oxyhaemoglobin 

ANSWER :A
Discussion
4534.

Question : Abiotic factors

Answer»

SOLUTION :AIR, WATER
Discussion
4535.

Question : Abiotic component in an ecosystem is

Answer»

WATER
DAPHNIA
BACTERIA
CHLORELLA

ANSWER :A
Discussion
4536.

Question : Abhishek's house is very near to a main road crossing having traffic signals. It was a Diwali night and there was a big traffic jam on the main road just outside his house. All the neighbours of Abhishek and other colony residents were also bursting crackers and enjoying many other types of fireworks.Abhishek's 70 year old grandmother, who was watching the fireworks, was taken ill suddenly.She complained of difficulty in breathing and also felt nausea and headache. Abhishek's grandmother was rushed to a nearby hospital where the doctors made her inhale some medicine and then put her on oxygen for some time. Abhishek's grandmother recovered fairly quickly. The doctor advised his grandmother to remain inside the house for that night with all the doors and windows closed. The doctor also asked her to buy a small, portable oxygen gas cylinder and use it to breathe at home if she felt suffocated again. (a) What made Abhishek's grandmother suddenly ill ? Which system/body part ofgrandmother got affected ? Whywas only Abhishek's grandmother affected? (c ) Give two reasons for this condition of Abhishek's grandmother. (d) What deficiency was caused in the body of Abhishek's grandmother ? (e) Why was grandmother advised to remain inside the house all the time with doors and windows closed ? (f) What advice would you give to others to avoid such a situation ?

Answer»

Solution :(a) ABHISHEK's grandmother became ill because she had inhald air polluted with toxic gases emitted by vehicles on the nearby road and Diwali fireworks.
(b) Respiratory system (including lungs) got affected. Only Abhishek's grandmother was affected because her lungs had become very weak due to old AGE.
(c ) (i)Air pollution caused by the exhaust gases of vehicles on the road just outside the house.
(ii) Air pollution caused by Diwali fireworks.
(d) The deficiency of oxygen was caused in the body of grandmother.
(e) Abhishek's grandmother was advised to remain INSIDE the house to avoid BREATHING too much polluted air outside.
(f) (i) Avoid fireworks on Diwali day to prevent too much air pollution.
(ii) Use LESS polluting fuels (such as CNG) in motor vehicles.
(iii) Use public transport (such as buses, metro, etc.) to travel within the city instead of individual vehicles.
(iii) If possible, take a house away from main road and traffic signals.
Discussion
4537.

Question : Abhinav was participating in a marathon (long distances race). He was running at position two right from the beginning. Just when he was nearing the finishing line, he started running even faster so as to stand first. And when he was about to win the marathon, he got a severe muscle cramp in hig leg. This cramp prevented Abhinav from running any further and shattered his dream of winning the marathon. (a) Which process provides most of the energy to Abhinav for running the marathon ? (b) which process provides a little extra energy to Abhinav for running very, very fast towards the end of race ? (c ) Which substance gets accumulated in teh leg muscles of Abhinav that causes muscle cramp ? (d) Why does this substance get accumulated in the leg muscles of Abhinav ? (e) What advice will you give to Abhinav so as to get relief from this cramp ? How will it help ?

Answer»

Solution :(a) Most of the ENERGY in the leg muscles of Abhinav for running the marathon is provided by AEROBIC respiration (which breaks down food like GLUCOSE with oxygen to produce large amount of energy).
(b) The little extra energy in the leg muscles for running very, very fast is provided by the process of anaerobic respiration (which breaks down food like glucose without oxygen to produce small amount of energy).
(c ) Lactic acid.
(d) The lactic acid gets ACCUMULATED in the leg muscles of Abhinav because during very fast running, oxygen gets used faster in the muscles than can be supplied by the blood. So, anaerobic respiration (without oxygen) takes place in muscle cells causing PARTIAL oxidation of glucose food to form lactic acid (and releasing some energy). This lactic acid gets accumulated in leg muscles.
(e) Abhinav should take a hot water bath or a massage. Hot water bath and massage improve the circulation of blood. Due to improved blood flow, the supply of oxygen to the leg muscles increases. This oxygen breaks down lactic acid accumulated in leg muscles and gives relief from cramp.
Discussion
4538.

Question : A,B and C are three common STDs. A and C are caused by bacteria whereas B is caused by a virus D. The virus D reduces the immunity of infected person to such a low level that the person to such a low level that the person can die of even very mild diseases. (a) What could A and C be ? (b) What is B ? (c ) Name the virus D ? (d) How can A, B and C be caused? (e) Out of A, B and C, which one does not have a definite cure as yet?

Answer»


SOLUTION :N//A
Discussion
4539.

Question : A zygote which has an X chromosome inherited from the father will develop into a

Answer»

male
female
either male or female.
X CHROMOSOME does not DETERMINE sex of a child.

Solution :This is the CORRECT ANSWER.
Discussion
4540.

Question : A zygote which has an X-chromosome inherited from the father will develop intoa

Answer»

BOY
girl
X- chromosome does not determine the sex of a CHILD
EITHER boy or girl

Answer :B
Discussion
4541.

Question : A yeast cell differs from a bacterial cell as it is

Answer»

multicellular
prokaryotic
eukaryotic
unicellular

Answer :C
Discussion
4542.

Question : a) Write two points of difference between electric energy and electric power.b) An electric bulb of 200 Omegadraws a current of 1 ampere. Calculate the power of the bulb the potential different at its ends and the energy in KWh consumed burning it for 5h.

Answer»

SOLUTION :a) Electric ENERGY: 1) The work done or energy supplied by the source in maintaining the flow of electric current is called electrical energy. It appeare in the form of heat given by
`VIt = (Vt)/(R) = VRt `
ii) It is EQUAL to the product of POWER and time
` E = P xx t`
iii) Its SI units is joule (J)
Electric power :
i) The time rate at which electric energy is consumed or disipated by an electrical DEVICE is called electric power and is given by
`P = vI = (v^2)/(R) = I^2 R`
ii)It is equal to rate of doing work by an energy source.
`P = w/t`
iii) Its SI unit is Watt (W)
1W = `1JS^(-1)`
(b)Power of the bulb
Power of the bulb,` P = I^2R = (1)^2 xx 200`
P= 200 W
Energy consumed by bulb in 5h in burning.
= Power x Time
= 200 x 5
= 1000 wh= 1Kwh.
Discussion
4543.

Question : Write two examples each of sexually transmitted diseases caused by (i) virus, (ii) bacteria. Explain how the transmission of such diseases be prevented?

Answer»

SOLUTION :a] Gonorrhoea, syphilis-CAUSED by bacteria, HIV -caused by virus
b] To prevent STDS, the following precautions can be taken
i] Practices involving protected sexual intercourse to reduce the risk in STD.
ii] AVOID multiple sex partners and maintain personal HYGIENE.
Discussion
4544.

Question : (a)Write the reaction that occurs when glucose breaks down anaerobically in yeast.(b)Write the mechanism by which fishes breath in water.(c)Name the balloon likes structures present in lungs. List its two functions.(d)Name the respiratory pigment and writeits role in human beings.

Answer»

Solution :(a) Glucose BREAKS down anaerobically, i.e., in absence of `O_(2)`, in yeast in thefollowing manner :
Glucose ` overset("In Cytoplasm")to "Pyruvate" overset(" In Cytoplasm, In absence of "O_(2))to "Ethanel" + CO_(2) +` Energy
(b) Since fishes are aquatic, they take in `O_(2)` dissolved in water. They take water through theirmouth which goes to theirgills where the dissolved oxygen is taken up by the blood and transported. The `CO_(2)`is given out through the same passage.
(C) The balloon like structures in our lungs are the alveoli. Their functions are :
(i) They are very thin walled and hence help in gaseous exchange.
(ii)They contain extensive network of blood vessels which help in TRANSPORT of respiratory gases.
(iii)They INCREASE the surface area for absorption of gases.
(d)Therespiratory pigment is haemoglobin. Its role is :(i)It has affinity for oxygen and hence helps in transport of oxygen form alveoli to body tissues.
(ii)It also has affinity for `CO_(2)` and hence helps in transport of `CO_(2)`from body tissues to alveoli .
Discussion
4545.

Question : (a) Write the names of those parts of a flower which serve the same function as the following do in the animals. (i) testis, (ii) sperm, (iii) ovary, (iv) egg (b) State the function of flowers in the flowering plants.

Answer»

Solution :(a) (i) testis - anther (ii) SPERM - POLLEN grains
(iii) OVARY - ovary (IV) egg- ovum
(b) Flowers are responsible for sexual reproduction as they contain the reproductive organs of the plant.
Discussion
4546.

Question : (a) Write the name of differentcomponents of transport system in human being and state their functions in brief .(b)How is blood clot form, if a leak develops in the system of blood vessels ?

Answer»

Solution :(a)VARIOUS components of transport system and their functions :
If there is a leak in the blood vessels due to injury, then the blood platelets HELP plug these LEAKS. Theplateletsmake the clot by forming a mesh LIKE structureover the leak in which other blood cells get entangled ULTIMATELY plugging the leak.
Discussion
4547.

Question : (a) Write the functions of the following parts in human female reproductive system : (i) Ovary, (ii) Oviduct, (iii) Uterus (b) Describe the structure and function of placenta.

Answer»

Solution :(a) (i) Ovary :
(i) Production of FEMALE hormone
(ii) Production of female gamete
(ii) Oviduct :
(i) Transfer of female gamete from the ovary
(ii) SITE of fertilization
(iii) Uterus :
(i) IMPLANTATION of the zygote.
(ii) Nourishment of the developing embryo/placenta formation.
(b) Structure of Placenta : It is a disc like structure embedded in the uterine wall connected to the embryo. It has villi on the embryo.s SIDE of the tissue and on the mother side, it has blood spaces, which surround the villi.
Function of Placenta : It provides a large SURFACE area for nutrients/glucose and oxygen to pass from the mother.s side to the embryo and waste substances from the embryo.s side to mother.s blood.
Discussion
4548.

Question :(a) Write the functions of the following parts in human female reproductive system: (i) Ovary (ii) Oviduct (iii) Uterus (b) Describe the structure and function of placenta.

Answer»

Solution : Ovary:
(i) Production of female hormone (Oestrogen and progesterone
(ii) Production of female gamete or egg.
Oviduct:
(i) Transfer of female gamete from the ovary.
(ii) Site of fertilisation.
Uterus:
(i) Implantation of zygote or EMBRYO.
(ii) NOURISHMENT of developing embryo.
The embryo inside the mother.s BODY gets nourishment through the placenta.
Placenta is a special disc like tissue embedded in the mother.s UTERINE wall and connected to the embryo. Placenta provides a large surface area for glucose and oxygen, and nutrients to PASS from the mother.s blood to the embryo.
Discussion
4549.

Question : (a) Write the functions of the following parts in human female reproductive system: (i) Ovary (ii) Fallopian tube (iii) Uterus (b) Describe the structure and functions of placenta.

Answer»

Solution :(a)
(b) Structure of placenta - It is a disc-like special tissue which is embedded in UTERINE WALL. It has VILLI on the embryo.s side and blood spaces on the mother.s side.
Functions of placenta:
(i) It provides large surface area for oxygen and glucose to pass through the mother.s blood into the embryo.
(II) The wastes from the developing embryo are removed by transferring into the mother.s blood through placenta.
Discussion
4550.

Question : A worm X found in freshwater and slow -moving streams has been accidently cut into three pieces. It was observed that in due course of time, each cut piece of the worm develops to become a complete worm by growing all the missing parts. (a) Name the worm X which can exhibit this phenomenon of making complete worm from its cut body parts. (b) Name another organism Y which possesses the same characteristic of growing full its cut body parts. (c) What is the name of this process in which a complete organism is formed from its cut body part. (d) State wheter X and Y are unicellula and / or multicellular organisms . (e) Can a dog be produced completely from its cut body part (say, a cut tail) just like organisms X and Y? Why?

Answer»


SOLUTION :N//A
Discussion