CBSE - Class 10 Science Heredity and Evolution Worksheet
1.
Exchange of genetic material takes place in
a.
vegetative reproduction
b.
asexual reproduction
c.
sexual reproduction
d.
budding
2.
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
3.
Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.
4.
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
5.
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
6.
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
7.
A trait in an organism is influenced by
a.
paternal DNA only
b.
maternal DNA only
c.
both maternal and paternal DNA
d.
neither by paternal nor by maternal DNA
8.
Differentiate between inherited and acquired characters. Give one example for each type.
9.
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 âTâ or âtâ
10.
Give reasons why acquired characters are not inherited.
11.
The number of pair (s) of sex chromosomes in the zygote of humans is
a.
one
b.
two
c.
three
d.
four
12.
Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.
13.
Give the basic features of the mechanism of inheritance.
14.
Give the pair of contrasting traits of the following characters in pea plant and mention which is dominant and recessive (ii) round seed
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
16.
Give the pair of contrasting traits of the following characters in pea plant and mention which is dominant and recessive (i) yellow seed
17.
Why do all the gametes formed in human females have an X chromosome?
18.
All the human races like Africans, Asians, Europeans, Americans and others might have evolved from a common ancestor. Provide a few evidences in support of this view.
19.
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
20.
Mention three important features of fossils which help in the study of evolution.
