Biology is the study of life and living things. It can be divided into different areas that look at the structure, function, anatomy, and behavior of organisms.
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Question 251: In animals, cilia, flagella, pseudopodia and chaetae, can be used for
Options:
A) reproduction
B) fighting
C) attachment to plants
D) locomotion
E) locating sensation
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The correct answer is D .
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Question 252: Seed plants are the most dominant vegetation on land because of
Options:
A) their motile gamates
B) their ability to photosynthesize
C) efficient seed dispersal
D) availability of water
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The correct answer is C .
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Question 253: For pollen to be released in Crotalaria the insect must depress the
Options:
A) wing
B) keel
C) standard
D) antepetalous stamen
E) antesepalous stamen
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The correct answer is B .
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Question 254: The primary structure responsible for pumping blood for circulation through the mammalian circulatory systems is the
Options:
A) veins
B) right auricle
C) arteries
D) left ventricle
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The correct answer is D .
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Question 255:
In the diagram, the change in the length of the neck of the giraffes shown was brought about by
Options:
A) geographical isolation
B) predation
C) symbiosis
D) natural selection
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The correct answer is D .
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Question 256: In lower plants like mosses, the structure which performs the functions of roots of higher plants is called
Options:
A) root hairs
B) rootlets
C) hypae
D) rhizoids
E) thalli
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The correct answer is D .
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Question 257:
Which of the following statements about viruses is true?
Options:
A) Viruses can reproduce outside of a host cell
B) Viruses require a host cell to replicate
C) Viruses possess a cellular structure
D) Viruses are living organisms
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The correct answer is B .
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Question 258:
In plants, respiration occurs in
Options:
A) The stomata and lenticel only
B) Mesophyll cells only
C) All living cells
D) The root only
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The correct answer is C .
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Question 259: If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are
Options:
A) RR, 2Rr, rr
B) 2RR, 2rr, 2rr
C) 2RR, 2Rr
D) 4Rr
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The correct answer is C .
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Question 260: During blood transfusion, agglutination may occur when
Options:
A) contrasting antigens reacts with contrasting antibodies
B) similar antigens react with similar antibodies
C) two different antigens react with each other
D) two different antibodies react with each other
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The correct answer is B .