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3051.

Question : In the result of Mendel's experiment on the inheritance of two characters, the ratio of the plants showing yellow and wrinkled seeds and of the plants showing green and round seeds in F_(2) generation is …………….....

Answer»

`3:3`
`9:3`
`3:1`
`9:1`

ANSWER :C
Discussion
3052.

Question : In the recent years there has been an increasing incidence of floods in the plains of northern India because

Answer»

there has been an INCREASE in annual rain- fall
the rate of SILTING of dams has gone up
there has been increased deforestation in the catchment areas
increased areas of land is being self culti- vated

ANSWER :C
Discussion
3053.

Question : In the presence of lactase, lactose breaks down into molecules of

Answer»

GLUCOSE and galactose
glucose and fructose
galactose only
glucose only 

ANSWER :A
Discussion
3054.

Question : Explain the external features of kidney in human beings.

Answer»

Solution :External features of mammal kidney are :
1) It is BEAN shaped and brown in colour.
2) Top of the kidneys you will observe adrenal gland.
3) 3 tubes come out from hilus. First one is ureter, second one is renal artery and third one is renal vein.
Internal features of kidney :
1) Each kidney is eonvex on theouter side and concave on the inner side.
2) OUTER zone in kidney T.S.is light brown colour whereas inner zone is dark brown colour.
3) Outer zone is called cortex and inner dark zone is called MEDULLA. Triangular calyces are present in medulla.
4) These medulla lead into ureter.
5) URETERS are whitish TUBE like structures.
Discussion
3055.

Question : In the new complementary strand of DNA, in one strand, the daughter strand is synthesized, as a continuous strand called………………..

Answer»

LAGGING STRAND
PARENT strand
RNA primer
Leading strand

Answer :D
Discussion
3056.

Question : In the modern periodic table, 'A' and 'B' are two elements belonging to first and seventeenth group respectively and both of them belong to the third period. Write their electronic configuration. Which of them is a metal? Why? Write the chemical formula of the compound obtained when these two elements react with each other.

Answer»

Solution :The two elements BELONGS to first and seventeenth GROUP and third period is .A.. SODIUM (NA) and .B. - Chlorine (CI)
Na : 2,8, 1
CI: 2, 8, 7
A(Sodium) will be the metal, because it has a single electron in its outer shell, which readily donates, creating a positively charged ion the Na cation.
`Na^(+) + Cl^(-) to NaCl`
When sodium reacts with chlorine to get sodium chloride.
Discussion
3057.

Question : In the list of organisms given below, those that reproduce by the asexual method are (i) dog (ii) banana. (ii) yeast.(iv) amoeba.

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(i) , (iii) and (IV)
(i),(ii) and (iii)
(i),(ii) and (iv)
(ii) and (iii) and (iv)

Solution :In dog sexual REPRODUCTION takes place while in yeast BUDDING, in amoeba binary fission and in banana vegetative reproduction takes place by underground STEM RHIZOME.
Discussion
3058.

Question : In the islets of Langerhans, beta cells secrete ……….

Answer»

SOLUTION :INSULIN
Discussion
3059.

Question : In the heart of man the bicuspid valve is situated between

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RIGHT ventricle and PULMONARY aorta
left auricle and left ventricle
right auricle and right ventricle
postcaval and auricle 

ANSWER :B
Discussion
3060.

Question :In the glomerulus of a kidney ,

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the AFFERENT glomerular CAPILLARIES are wider than the EFFERENT glomerular capillaries
the afferent glomerular capillaries are narrower than the efferent glomerular capillaries
the afferent glomerular ARTERIOLE is narrower than the efferent glomerular artriole .
the afferent glomerular arteriole is wider than the efferent glomerular arteriole

ANSWER :d
Discussion
3061.

Question : In the given figure the parts A, B and C are sequentially area

Answer»

stigma, pollen TUBE, ovary
pollen GRAIN, pollen tube, ovary
stigma, style, ovary
pollen grain, style, ovary .

SOLUTION :Pollen grain fall on stigma pollen tube passes through style and REACHES the ovary to enter the OVULE.
Discussion
3062.

Question : In the given figure of Cotyledon the parts labelled as A and B respectively are

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FRUIT, SHOOT
PRIMARY shoot, primary ROOT
secondary root, primary shoot
bud, leaf

Answer :B
Discussion
3063.

Question : In the given figure , the arrows depict the movement of water in the tree.(a)What do the arrows A, B and C represent ?(b)What kind of movement is A and what is C ?(c)Explain the three forces responsible for uptake of water .

Answer»

Solution :(a) A represents Root Pressure.
B represents Cohesion-Adhesion force.
C represents Transpirational PULL.
(b)A ispush while C is pull.
(c) In plants, water and minerals and transported through xylem. The xylem vessels and tracheids are interconnected throughoutroots, stem and leaves to FORM continuouswater conducting channels. There are THREE factors / forces that help in transportaition:
(i)Root Pressure : The root hair, in CONTACT with soil, take up water and minerals. This creates a concentration gradient inside the rootand outside. Thus move water moves in, creating pressure inside the rootsknown as root pressure. This induces steady movementof water into root xylem .
(ii)Transpirational Pull :The leaves, on top, are continuously losing water, DUE to transpiration. This process results in upward pull of water and minerals, from roots to leaves, due to suction pull. Thus transpiration is a mojorforce during the day.
(iii)Cohesion - Adhesion force : Strong of attraction between two water molecules (cohesion) and betweenwater and xylem (adesion) result in a continuouscolumn of water which is pushed inwards due to root pressure and upward due to transpiration pull.
Discussion
3064.

Question : In the given figure label the concerned with (a) Production of egg. (b) Site of fertilisation. (c) Site of implantation. (d) Site of entry of sperm.

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SOLUTION :
Discussion
3065.

Question : In the given figure label the parts numbered 1 to 6.

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Solution :1. Pollen grain
2. Stigma
3. Pollen TUBE
4. Style
5. Ovary
6. Synergids
Discussion
3066.

Question : In the given diagram of reflex arc :Write the functions of B and E.

Answer»

Solution :B - CARRIES IMPULSE from receptor to spinal cord
E - RESPONDS to stimulus
Discussion
3067.

Question : In the given diagram, certain part of the alimentary canal (X) has been removed.(a)Identify A, B and C giving theirfunction.(b)Why has 'X' been removed ?(c)How does it affect digestion ?

Answer»

Solution :(a) A - Oesophagus- Food is pushed down into the stomach by peristalsis.
B- Liver - Its SECRETION bile helps in emulsification of fats and making the MEDIUM alkaline so thatpancreaticenzymes can further the process of digestion.
C- Pancreas - Secrete enzymes to digest PROTEINS, fats and carbohydrates.
(b).X. is stomach. It has been removed may be because of some accidnet in which it was damaged or due to some diseases. SOMETIMES some people get it cut to make it smaller so thatthey feel full easily, even by smaller portions of food (mainly to lose wight.)
(c) By removing stomach, digestion is abversely affected. It is in stomach that protein digestion begins in acidic medium. Because of its removal proteinswould be DIFFICULT to digest, affecting overall health.
Discussion
3068.

Question : In the given diagram of reflex arc :Name the parts labelled A, B, C, D and E.

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Solution :A - RECEPTOR
B - SENSORY NEURON / nerve
C - relay neuron / interneuron
D - motor neuron / nerve
E - effector.
Discussion
3069.

Question : In the following set one word is odd one. Write down the category of the group having identified the odd one as shown in the example. Example : Cell wall, vacuole, centrosome, plastids, mitochondria.

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Solution :
(i) Myopia, Cataract, HYPERMETROPIA, SQUINT, Cretinism.
(II) Malleus, pinna, incus, stapes.
Discussion
3070.

Question : Select the odd one out w.r.t haemophilia

Answer»

Solution :
(i) BLINKING, Knitting without looking, Smiling, Blushing, Crying.
(ii) Cerebrum, CEREBELLUM, THALAMUS, HYPOTHALAMUS.
Discussion
3071.

Question : In the following groups of materials, which group(s) contains only non-biodegradable items? (i) Wood, paper, leather (ii) Polythene, detergent, PVC (iii) Plastic, detergent, grass (iv) Plastic, bakelite, DDT

Answer»

(iii)
(iv)
(i) and (iii)
(II) and (iv)

Solution :Polythene, DETERGENT, PVC, plastic, BAKELITE and DDT are non-biodegradable SUBSTANCES.
Discussion
3072.

Question : In the following food chain 20 J of energy was available to the hawks. How much would have been present in the plants ? Plants to Rats to Snakes to Hawks

Answer»

SOLUTION :
Discussion
3073.

Question : In the following crosses, write the characteristics of the progeny : rryy xx rryy

Answer»

Solution :All wrinkled and green. (REASON All gametes PRODUCED will have only ONE TRAIT)
Discussion
3074.

Question : In the following crosses, write the characteristics of the progeny : RrYy xx RrYy

Answer»

Solution :Round yellow : 9
Round green : 3
WRINKLED yellow : 3
Wrinkled green : 1
(Reason - This cross is LIKE F2 of Mendel.s DIHYBRID cross)
Discussion
3075.

Question : In the following diagram which trophic level will have the maximum energy ?(##NKM_FS_BIO_X_C08_E06_017_Q01.png" width="80%">

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`T_(1)`
`T_(2)`
`T_(3)`
`T_(4)`

ANSWER :A
Discussion
3076.

Question : In the figure, X denotes.

Answer»

SOLUTION :WATER FILM
Discussion
3077.

Question : In the five-kingdom system of classification developed by Robert Whittaker, members of the kingdom Plantae are autotrophic, eukaryotic, and

Answer»

MULTICELLULAR
motile
have SEXUAL reproduction
either UNICELLULAR or multicellular 

ANSWER :A
Discussion
3078.

Question : In the experiment performed by Mendel on dihybrid inheritance, there are four types of plants formed in the F_(1) generation.

Answer»


ANSWER :1
Discussion
3079.

Question : In the ecosystem wild animals like lions, tigers, are important.

Answer»

Solution :(i) In the forests, the GREEN plants play the role of producers. They perform photosynthesis and produce food which isavailable for hebivores.
(II) Herbivores feed on green plants and astisfy their energy requirement and they become food for carnivores.
(iii) Lion, tigers are secondary or top level consumers which feed on herbivores.
(iv) In order to maintain ecological balance, every organism in necessary. If there are no wild ANIMALS, then the number of herbivores will increase beyond certain limit which may affect the green plants.
(V) Hence, predators like lion and tiger are important to prevent the OVERPOPULATION of herbivores.
Discussion
3080.

Question : In the diagram of human male reproductive system given below : (i) Label the parts A and B. (ii) Name the hormone produced by organ 'X'. What is the role of this hormone in the human male? (iii) Mention the name of substances that are transported by tubes. (i) C and (ii)

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SOLUTION : (i) A-Seminal vesicle B-Prostate gland.
(ii) TESTOSTERONE, controls gamete formation and DEVELOPS secondary sex organs.
(iii) (a) C-Sperms, (b) D-Sperms/semen and URINE.
Discussion
3081.

Question : In the context of reproduction of species state the main difference between fission and fragmentation. Also give one example of each.

Answer»

Solution :Fission is the method of ASEXUAL reproduction in unicellular forms of LIFE. In this process the PARENT organism SPLITS to form two or more daughter cells. Example, Ameoba and Plasmodium
Fragmentation is the process found in multicellular organisms. The filament breaks up into two or more pieces upon maturation. These pieces then grow into new individuals. Example, SPIROGYRA.
Discussion
3082.

Question : In the corn cob the tassels which wave in the wind to trap the pollen grains represents

Answer»

STIGMA and style
Style and ovary
Stigma
Style

Answer :A
Discussion
3083.

Question : In the chart of energy flow given below identify the decomposers and explain your choice:

Answer»

SOLUTION :In the chart B INDICATES decomposers. They decompose DEAD materials available from A, C and D.
Discussion
3084.

Question : In the central nervous system mylinated fibres from the white matter.

Answer»

Solution :In the central nervous system, two types of MATTER such as WHITE matter or grey matter,is FORMED, with respect to the presence or absence of MYELIN sheath.
Discussion
3085.

Question : In the case of mammals testes are extra abdominal situated in scrotal sacs because

Answer»

there is lack of space in ABDOMEN
scrotal sacs have LESS temperature than abdomen, which is essential for maturation of sperms
scrotal sacs have HIGH temperature than abdomen, which is essential
it helps in EASY discharge of sperms during copulation

Answer :B
Discussion
3086.

Question : In the ball and socket joint the friction of two bones is lessned by

Answer»

mucin
pericardial fluid
coelomic fluid
synovial fluid

Answer :D
Discussion
3087.

Question : In the absence of muscle cells, how do plant cells show movement ?

Answer»

Solution :The ability of a plant to detect change and respond to that change is TERMED as the sensitivity of the plant. Yet plants have no nervous system and no muscle tissue, they USE electrical and chemical means to convey the information from one cell to another cell. The leaces of the sensitive plant (Misosa pudica) folds up in response to touch.
These LEAF movements are independent of GROWTH whereas, the directional movement of the shoot of a GERMINATING seedling breaking through the soil is growth dependent.
Discussion
3088.

Question : In tabacco plant, the male gametes have 24 chromosomes. (i) what is the number of chromosomes in the female gamete ? (ii) What is the number of chromosomes in the zygote ?

Answer»


SOLUTION :N//A
Discussion
3089.

Question : In submerged hydrophytes functional stomata are found

Answer»

on lower surface of leaf
on both the surface of leaf
no where on the PLANT
on UPPER smface of leaf

Answer :C
Discussion
3090.

Question : In stomach, gastric acid is released by,

Answer»

PEPTIC CELLS
gastric cells
ACIDIC cells
parietal cells

Answer :D
Discussion
3091.

Question : In Spirogyra, asexual reproduction takes place by

Answer»

division of CELL into two cells.
breaking up of filaments into smaller bits.
division of cell into many cells.
formation of young cells from older cells.

SOLUTION :SPIROGYRA REPRODUCES ASEXUALLY by fragmentation.
Discussion
3092.

Question : In soil, water available to plants roots is

Answer»

HYGROSCOPIC WATER
capillary water
gravitation Water
colloid water 

ANSWER :B
Discussion
3093.

Question : In sexual reproduction, creation of diversity in characters are fulfilled by ………………….

Answer»


ANSWER :GENETIC VARIATION
Discussion
3094.

Question : In seed plants which structure evolved into a pollen grain?

Answer»

Sporophyll
Male gametophyte
Female gametophyte
Sporopollenin 

ANSWER :B
Discussion
3095.

Question : In same flowers, the stamens and pistil reach maturity at the same time. It is known as

Answer»

porogamy
mesogamy
siphonogamy
homogamy

Answer :D
Discussion
3096.

Question : In Salvia the pollination is affected by

Answer»

water
air
animals
insects

Answer :D
Discussion
3097.

Question : In Rhizopus, tubular thread like structures bearing sporangia at their tips are called

Answer»

RHIZOIDS
hyphae
roots
pyrenoid

Solution :The body of RHIZOPUS is COMPOSED of thread LIKE structures called hyphae. Pyrenoids are found in Algae, rhizoids in Bryophytes and roots in PLANTS.
Discussion
3098.

Question : In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called

Answer»

Filaments
Hyphae
Rhizoids
Roots

Answer :B
Discussion
3099.

Question : Oin reflex action,the reflex arc is formed by_

Answer»

brain, SPINAL cord, MUSCLE
RECEPTOR, muscle, spinal cord
muscle, receptor, brain
receptor, spinal cord, muscle

Answer :B
Discussion
3100.

Question : In Rabbits, as male and female sexes are separate, ...............is exhibited

Answer»

SOLUTION :SEXUAL DIMORPHISM
Discussion