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 391: In a population of living things, the parameters of size, height, weight and colour are examples of
Options:
A) discontinuous variation
B) continuous variation
C) physiological variation
D) non-heritable variation
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The correct answer is B .
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Question 392: The correct increasing order of size for the cell components responsible for heredity is
Options:
A) chromosome → DNA → nucleus → gene
B) DNA → gene → chromosome → nucleus
C) chromosome → nucleus → DNA → gene
D) DNA → gene → nucleus → chromosome
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The correct answer is B .
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Question 393: A step in the movement of energy through an ecosystem is a description that best fits the term
Options:
A) food chain
B) trophic level
C) pyramid of numbers
D) food web
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The correct answer is B .
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Question 394: the larval stage of a mosquito is called
Options:
A) wriggler
B) grub
C) maggot
D) caterpillar
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The correct answer is A .
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Question 395: Which of the following is a common characteristic of crustaceans?
Options:
A) Possession of a pair of antennae
B) Possession of two pairs of antennae
C) Each segmented has a pair of walking legs
D) Four pairs walking on the cephalothorax
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The correct answer is B .
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Question 396:
The part labelled II is the
Options:
A) silk thread
B) thorax
C) fore wing
D) anchor
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The correct answer is A .
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Question 397:
Which of the organisms represented are notable agricultural pests
Options:
A) II and IV
B) I and IV
C) I and III
D) II and III
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The correct answer is B .
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Question 398: The population density of Tridex in an abandoned square farm land of side 200 m was found to be 5 plants per m2. The population size of the plant on the farm is
Options:
A) 40
B) 1000
C) 40000
D) 200000
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The correct answer is D .
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Question 399: Which of the following is a major cause of variation among organisms?
Options:
A) Inbreeding
B) Backcrossing
C) Sexual reproduction
D) Gene dominance
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The correct answer is D .
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Question 400: If a farmer left his land uncultivated for five years before returning to it, he must be practising
Options:
A) modern agriculture
B) strip cropping
C) contour ridging
D) crop rotation
E) the bush fallow system
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The correct answer is E .