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CBSE - Class 10 Science Heredity and Evolution Worksheet

The two versions of a trait (character) which are brought in by the male and female gametes are situated on

a. copies of the same chromosome b. two different chromosomes c. sex chromosomes d. any chromosome

How is the sex of a newborn determined in humans?

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that

a. reptiles have evolved from birds b. there is no evolutionary connection between reptiles and birds c. feathers are homologous structures in both the organisms d. birds have evolved from reptiles

Select the statements that describe characteristics of genes
(i) genes are specific sequence of bases in a DNA molecule
(ii) a gene does not code for proteins
(iii) in individuals of a given species, a specific gene is located on a particular chromosome
(iv) each chromosome has only one gene

a. (i) and (ii) b. (i) and (iii) c. (i) and (iv) d. (ii) and (iv)

Give the pair of contrasting traits of the following characters in pea plant and mention which is dominant and recessive (i) yellow seed

Mention three important features of fossils which help in the study of evolution.

If a round, green seeded pea plant ($RR yy$) is crossed with wrinkled, yellow seeded pea plant, ($rr YY$) the seeds produced in $F_1$ generation are

a. round and yellow b. round and green c. wrinkled and green d. wrinkled and yellow

Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria? Provide a suitable explanation.

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

10.

Does the occurrence of diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution.

11.

Why do all the gametes formed in human females have an X chromosome?

12.

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

13.

Which of the following statement is incorrect?

a. For every hormone there is a gene. b. For every protein there is a gene. c. For production of every enzyme there is a gene. d. For every molecule of fat there is a gene

14.

In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.

15.

Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.

16.

Give the pair of contrasting traits of the following characters in pea plant and mention which is dominant and recessive (ii) round seed

17.

Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.

18.

In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are
(i) large chromosome
(ii) small chromosome
(iii) Y-chromosome
(iv) X-chromosome

a. (i) and (ii) b. (iii) only c. (iii) and (iv) d. (ii) and (iv)

19.

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

20.

New species may be formed if
(i) DNA undergoes significant changes in germ cells
(ii) chromosome number changes in the gamete
(iii) there is no change in the genetic material
(iv) mating does not take place

a. (i) and (ii) b. (i) and (iii) c. (ii), (iii) and (iv) d. (i), (ii) and (iii)

Worksheet Answers

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