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 681: The chromosome number of a cell before and after the process of meiosis is conventionally represented as
Options:
A) 2n → 2n
B) n → n
C) n → 2n
D) 2n → n
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The correct answer is D .
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Question 682:
Use the diagram shown to answer the question. After an hour, the level of water in the thistle funnel will
Options:
A) rise
B) fall
C) remain the same
D) double
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The correct answer is A .
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Question 683: The lungs of the lung fish is an adaptation for respiration _______?
Options:
A) to complement gills while in water
B) to complement gills while on land
C) while on land
D) while in water
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The correct answer is D .
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Question 684: The number of alleles controlling blood groups in humans
Options:
A) 3
B) 4
C) 5
D) 2
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The correct answer is A .
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Question 685:
The function of the part labelled 1 is to
Options:
A) secrete a fluid which lubricates the joint
B) attach muscles to the bones at the joint
C) bend the bones at the joint
D) hold the joint in place
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The correct answer is C .
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Question 686:
Ecological succession refers to
Options:
A) The movement of organisms from one habitat to another
B) The competition among species for limited resources
C) The process of natural selection in a population
D) The gradual and predictable change in a community over time
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The correct answer is D .
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Question 687:
Which of the following characteristics is typical of the phylum Arthropoda?
Options:
A) Radial symmetry
B) Closed circulatory system
C) Endoskeleton made of bones
D) Presence of a segmented body
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The correct answer is D .
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Question 688: The progressive loss of energy at each level in a food chain leads to
Options:
A) an increase in biomass at each successive level
B) a decrease in biomass at each successive level
C) an increase in the number of organism at each successive level
D) an increase in the total number of organisms at each successive level
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The correct answer is B .
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Question 689:
Petaloid sepals serve the function of
Options:
A) carrying out photosynthesis
B) attracting pollinating agents to a flower
C) retaining pollen grains in the corolla tubes
D) protecting the inner floral parts of the flower
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The correct answer is D .
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Question 690: Both recessive and dominant characters are found
Options:
A) on different chromosomes in the cell
B) at the same locus of a homologous chromosome
C) at different loci of a homologous chromosome
D) on the same chromatid in a chromosome
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The correct answer is B .