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CBSE - Class 10 Science Heredity and Evolution Worksheet

Study the following cross and showing self pollination in $F_1$, fill in the blank and answer the question that follows.

From the list given below, select the character which can be acquired but not inherited

a. colour of eye b. colour of skin c. size of body d. nature of hair

The theory of evolution of species by natural selection was given by

a. Mendel b. Darwin c. Morgan d. Lamarck

What are the combinations of character in the $F_2$ progeny? What are their ratios?

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

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

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

Select the group which shares maximum number of common characters

a. two individuals of a species b. two species of a genus c. two genera of a family d. two genera of two families

In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in $F_2$ is

a. 1 : 3 b. 3 : 1 c. 1 : 1 d. 2 : 1

10.

A zygote which has an X-chromosome inherited from the father will develop into a

a. boy b. girl c. X- chromosome does not determine the sex of a child d. either boy or girl

11.

Give the basic features of the mechanism of inheritance.

12.

Differentiate between inherited and acquired characters. Give one example for each type.

13.

Exchange of genetic material takes place in

a. vegetative reproduction b. asexual reproduction c. sexual reproduction d. budding

14.

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)

15.

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

16.

Give reasons for the appearance of new combinations of characters in the $F_2$ progeny.

17.

Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be

a. double fertilisation b. self pollination c. cross fertilisation d. no fertilisation

18.

How is the sex of a newborn determined in humans?

19.

A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because

a. tallness is the dominant trait b. shortness is the dominant trait c. tallness is the recessive trait d. height of pea plant is not governed by gene ‘T’ or ‘t’

20.

The number of pair (s) of sex chromosomes in the zygote of humans is

a. one b. two c. three d. four

Worksheet Answers

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