Case Study Questions for Class 12 Biology Chapter 13 Organisms and Populations

Case Study Questions for Class 12 Biology Chapter 13 Organisms and Populations

Question 1:

Organism P has thick lips and tongue so that it can easily feed on the commonly available spiny plants. Organism Q has thick layer of insulating fat under the skin. It was strong hooves to walk steadily on steep surfaces and lives in burrows during winters. Organism R has bright colours and sticky pads on its fingers and toes. It lives on trees.

(i) Which of the following is correct habitat for organisms P regarding its adaptation?
(a) Grassland biome
(b) Desert biome
(c) Tropical rainforest
(d) Tropical deciduous forest

(ii) Which of the following is correct match regarding organism Q and its habitat?
(a) Tundra – Polar bear
(b) Tropical rain forest – Deer
(c) Grassland – Bighorn sheep
(d) Desert – Camel

(iii) Which of the following is incorrect regarding organisms R’s habitat?
(a) The vegetation shows stratification
(b) Epiphytic growth is rich
(c) Standing crop is highest
(d) Deep rooted shrubs are common due to abundant sunlight

(iv) The dominant plants in habitat where P lives could be
(a) Opuntia
(b) Nymphaea
(c) Deodar
(d) both (a) and (c).

(v) Organisms P, Q and R respectively most likely occur in

(a) F, B and A
(b) C, A, E
(c) A, F and C
(d) B, D and A.

Answer

Answer: (i) (b) P is a camel adapted to desert conditions as it has thick lips and tongue so that it can easily feed on the commonly available spiny plants.
(ii) (a) Q is polar bear as it has thick insulating fat layer under the skin.
(iii) (d) R could be poison dart frog as it has bright colours and sticky pads on its fingers and toes and its habitat is tropical rainforest. Deep rooted shrubs are not found in tropical rainforest. These are found in deserts.
(iv) (a) Habitat of P is desert, so, the dominant plant is Opuntia.
(v) (c)

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