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Standard X

Biology

Artificial Selection

The farmers h...

Question

The farmers have been cultivating a food plant X for over two thousand years and have produced as many as five entirely different looking vegetables A, B, C, D and E from it.
(a) What could the plant X be?
(b) What are A, B, C, D and E?
(c) What is the process of evolution involved in this example known as?

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Solution

(a) X is wild cabbage.
(b) A is cabbage, B is broccoli, C is cauliflower, D is kohlrabi, E is kale.
(c) The process of artificial selection is involved in this example.

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Q. A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds.
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The organisms A, B and C can obtain their food in three different ways. Organism A derives its food from the body of another living organism which is called its D, without killing it. The organism B takes in the solid food by the process of ingestion, digests a part of this food and throws out undigested food in the process called E. The organism C obtains its food from dead and decaying plants.

(a) What is the mode of nutrition of (i) organism A (ii) organism B, and (iii) organism C?
(b) What is the organism like D called?
(c) Name the process E.
(d) Give one example each of organisms like (i) A (ii) B, and (ii) C.
(e) What is the general name of three modes of nutrition exhibited by organisms A, B and C?

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(a) X is wild cabbage. (b) A is cabbage, B is broccoli, C is cauliflower, D is kohlrabi, E is kale. (c) The process of artificial selection is involved in this example.

(a) X is wild cabbage.
(b) A is cabbage, B is broccoli, C is cauliflower, D is kohlrabi, E is kale.
(c) The process of artificial selection is involved in this example.