Biology | Study Mode

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Question 11
A
to remove excess water in plant 
B
to absorb water from the atmosphere 
C
for gaseous exchange 
D
to absorb light 
E
to store food 
Explanation.

A lenticel is one of many raised pores in the stem of a woody plant that allows gas exchange between the atmosphere and the internal tissues.


Correct Option:
C
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Question 12
A
1,2,3,4,5 
B
1,2,4,5,3 
C
3,4,5,2,1 
D
5,4,1,3,2 
E
5,4,3,1,2 
Explanation.

Sexual reproduction in Spirogyra occurs by a process known as conjugation, in which cells of two filaments lying side by side are joined by outgrowths called conjugation tubes. This allows the contents of one cell to completely pass into and fuse with the contents of the other. The resulting fused cell (zygote) becomes surrounded by a thick wall and overwinters, while the vegetative filaments die.


Correct Option:
D
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Question 13
A
Presence of chloroplast 
B
possession of cellulose cell-wall 
C
absence of large vacuoles 
D
presence of large vacuoles 
E
presence of chromosome 
Explanation.

Unlike the plant cell which possesses one or a few large vacuoles, the animal cell possesses vacuoles but they are smaller in size and plenty in quantity when compared to that of the plants.


Correct Option:
C
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Question 14
A
converting nitrate to nitrogen 
B
converting ammonium salt to nitrate 
C
converting atmospheric nitrogen to plant nitrogen 
D
converting nitrate to nitrous oxide 
E
converting atmospheric nitrogen to nitrates 
Explanation.

Nitrifying bacteria are microorganisms that help to convert soil ammonium to nitrates, the form in which it is usable by the plants.


Correct Option:
B
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Question 15
A
man 
B
snail 
C
mosquito larva 
D
crayfish 
E
fish 
Explanation.

Bhilharzia is another name for snail fever, which attacks primarily the snail's urinary tract.


Correct Option:
B
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Question 16
A
A geen filament algae, a flowering plant and a bird 
B
A toad (or frog) , ameoba and mucor ( penicillium) 
C
A flowering plant, tape worm (or ascaris) and a green filamentous algae 
D
Mucor (or penicillium), a bird and a toad (or frog) 
E
Ameoba, mucor (or penicillium ) and a green filamentous algae 
Explanation.

Amoeba reproduces by binary fission which is a form of asexual reproduction. Also, the mucor as well as the green algae reproduce asexually .


Correct Option:
E
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Question 17
A
thyroid gland 
B
pancreas 
C
adrenal gland 
D
liver 
E
spleen 
Explanation.

The adrenalin is a hormone which is released in times of danger. It is produced in the adrenal gland.


Correct Option:
C
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Question 18
A
a community 
B
a population 
C
a specie 
D
a habitat 
E
an ecosystem 
Explanation.

The ecology of ecosystem has to do with the study of every factor living (biotic) and non- living (abiotic), which affects the population.


Correct Option:
E
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Question 19
A
the shoot absorbed 1g of water per hour 
B
1g of water per hour evaporates from the potometer 
C
the shoot lost 1g of water per hour 
D
the potometer water receded at the rate of 1g per hour 
E
the shoot was respiring and lost weight at rate of 1g per hour 
Explanation.

The amount of water lost is (18.9 - 17.9)g = 1g. Hence, the water lost by the shoot is 1g.


Correct Option:
C
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Question 20
A
one chromosome from the male joins another from the female 
B
one gene from the male combines with another from the female 
C
the male nucleus fuses with the female nucleus 
D
one set of chromosome combines with another set from the female 
E
one cell from the male fuses with another from the female 
Explanation.

Fertilization is the union of a spermatozoal nucleus, of paternal origin, with an egg nucleus, of maternal origin, to form the primary nucleus of an embryo.


Correct Option:
C
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