NCERT Class X Science Class: Chapter –9. Heredity and Evolution – Part-3

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Question 11:

Two pea plants one with round green seeds and another with wrinkled yellow seeds produce progeny that have round, yellow seeds. When plants are selfed, the progeny will have new combination of characters. Choose the new combination from the following

(i) Round, yellow

(ii) Round, green

(iii) Wrinkled, yellow

(iv) Wrinkled, green

(a) (i) and (ii)

(b) (i) and (iv)

(c) (ii) and (iii)

(d) (i) and (iii)

Answer: B

Image the dihybrid cross

Image the Dihybrid Cross

Question 12:

A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?

(a) Carrot and potato

(b) Carrot and tomato

(c) Radish and carrot

(d) Radish and potato

Answer: C

Image the homologous structures

Image the Homologous Structures

Question 13:

Select the correct statement

(a) Tendril of a pea plant and phylloclade of Opuntia are homologous

(b) Tendril of a pea plant and phylloclade of Opuntia are analogous

(c) Wings of birds and limbs of lizards are analogous

(d) Wings of birds and wings of bat are homologous

Answer: A

Image tendrils of cucubits and spines of bougainvillea

Image Tendrils of Cucubits and Spines of Bougainvillea

Question 14:

If the fossil of an organism is found in the deeper layers of earth, then we can predict that

(a) The extinction of organism has occurred recently

(b) The extinction of organism has occurred thousands of years ago

(c) The fossil position in the layers of earth is not related to its time of extinction

(d) Time of extinction cannot be determined

Answer: B

Question 15:

Which of the following statements is not true with respect to variation?

(a) All variations in a species have equal chance of survival

(b) Change in genetic composition results in variation

(c) Selection of variants by environmental factors forms the basis of evolutionary processes.

(d) Variation is minimum in asexual reproduction

Answer: A

Image the variation in rabbit

Image the Variation in Rabbit

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