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Biology · 2026 · 3 marks
CBSE 2026 · Region 4 · Set 1 · Q27
(a) Study the graph given below and answer the questions that follow: (i) Write the status of food and space in the curves a and b. (ii) In the…
Study the graph given below and answer the questions that follow:
(i)
Write the status of food and space in the curves a and b.
(ii)
In the absence of predators, which one of the two curves would appropriately depict the prey population ?
(iii)
'Time' has been shown on x-axis and there is a parallel dotted line above it. Give the significance of this dotted line.
Answer the following questions :
(i)
Define 'predation'.
(ii)
Why is predation required in a community of different organisms ? Give any two points.
(iii)
Why are predators 'prudent' in nature ?
Marking-scheme solution
(i)
• Curve (a) – The food and space are unlimited.
• Curve (b)- The food and space are limited.
(ii)
Curve ‘a’
(iii)
It represents the carrying capacity which means the maximum number of
individuals that a given environment can support and beyond which further growth is not possible.
(i)
Predation is the interspecific interaction in which a large animal called predator kills and consumes a smaller animals called prey.
(ii)
It keeps the prey population under control.
It helps in maintaining species diversity in a community by reducing the intensity
of competition among competing prey species.
It acts as conduit for energy transfer across trophic level.
Biological control methods adopted in agricultural pest control are based on the
ability of the predator to regulate prey population.
(iii)
If a predator is too efficient and over exploits its prey then the prey might
become extinct and following it the predator will also become extinct for lack of food.
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.