Class 10 Science Chapter 9 MCQ

Class 10 Science Chapter 9 MCQ (Multiple Choice Questions) of Heredity and Evolution. All the objective questions are important for examination point of view. Practice science chapter 9 of class 10 here with these MCQs and score better in all exams.

All the MCQs are taken from NCERT Textbooks issued for new academic session 2020-2021.

Class 10 Science Chapter 9 MCQ Online Test for 2020-2021

Class: 10Science
Chapter: 9Heredity and Evolution
Contents:MCQ Online Tests with Answers and Explanation

Class 10 Science Chapter 9 MCQ with Answers for 2020-21

Class 10 Science Chapter 9 MCQ Online Test with solutions and answers. All the questions are taken from NCERT intext part as well as exercises section. Answers and explanation are also taken from NCERT Books for Class 10 Science only.


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

[A]. One
[B]. Two
[C]. Three
[D]. Four

In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2 is

[A]. 1 : 3
[B]. 3 : 1
[C]. 1 : 1
[D]. 2 : 1


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

According to the evolutionary theory, formation of a new species is generally due to

[A]. Sudden creation by nature
[B]. Accumulation of variations over several generations
[C]. Clones formed during asexual reproduction
[D]. Movement of individuals from one habitat to another


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 incorrect statement

[A]. Frequency of certain genes in a population change over several generations resulting in evolution
[B]. Reduction in weight of the organism due to starvation is genetically controlled
[C]. Low weight parents can have heavy weight progeny
[D]. Traits which are not inherited over generations do not cause evolution

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

If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in F1 generation are

[A]. Round and yellow
[B]. Round and green
[C]. Wrinkled and green
[D]. Wrinkled and yellow


Which of the following may be used to obtain an F2 generation?

[A]. Allowing flowers on a parent plant to be self-pollinated
[B]. Allowing flowers on an F1 plant to be self-pollinated
[C]. Cross-pollinating an F1 plant with a parent plant
[D]. Cross-pollinating two parent plants

In order to ensure that he had pure-breeding plants for his experiments, Mendel:

[A]. Cross-fertilised each variety with each other
[B]. Let each variety self fertilise for several generations
[C]. Removed the female parts of the plants
[D]. Removed the male parts of the plants.

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Which type of traits can be inherited?

Those Variations, which arise during the process of reproduction, can be inherited.

What is meant by heredity?

Transfer of traits from parents to offspring is called heredity.

How do we determine the age of fossil?

There are two components to determine the age. One is, if we dig into the earth and start finding fossils, it is reasonable to suppose that the fossils we find closer to the surface are more recent than the fossils we find in deeper layers. The second way of dating fossils is by detecting the ratios of different isotopes of the same element in the fossil material.

What are fossils?

When a living being dies and the dead body gets caught in hot mud, for example, it will not decompose quickly, and the mud will eventually harden and retain the impression of the body parts of the living being. All such preserved traces of living organisms are called fossils.