← Back to Chapter
Important:
CBSE provides complete Class 10 Science question papers through
its official question-paper archive. Since the archive itself
does not consistently identify every question by chapter,
chapter-focused questions below are kept separate from the
official paper links.
Official CBSE Previous Year Papers
Chapter-Focused Practice
Practice Question 1
Why is reproduction necessary for the continuity of a species?
Reproduction produces new individuals and thereby maintains
the continuity of a species across generations.
Practice Question 2
Differentiate between asexual and sexual reproduction.
Asexual reproduction generally involves one parent and does
not involve fusion of gametes.
Sexual reproduction involves formation and fusion of gametes
and generally produces greater genetic variation.
Practice Question 3
Explain binary fission with an example.
In binary fission, one parent cell divides to form two
daughter cells. Amoeba is a common example.
Practice Question 4
Explain budding with an example.
In budding, a small outgrowth develops on the parent organism,
grows and may detach to form a new individual. Hydra is a
common example.
Practice Question 5
What is vegetative propagation? Give two examples.
Vegetative propagation is asexual reproduction in plants in
which new plants develop from vegetative parts.
Examples include potato from stem tuber and Bryophyllum
from leaves.
Practice Question 6
What is pollination?
Pollination is the transfer of pollen grains from anther to
stigma.
Practice Question 7
What is fertilisation in flowering plants?
Fertilisation is the fusion of male and female gametes,
resulting in formation of a zygote.
Practice Question 8
What happens to the ovule and ovary after fertilisation?
The ovule generally develops into a seed and the ovary
develops into a fruit.
Practice Question 9
Where does fertilisation usually occur in humans?
Fertilisation usually occurs in a fallopian tube.
Practice Question 10
What is implantation?
Implantation is the attachment of the developing embryo
to the lining of the uterus.
Practice Question 11
What is the role of the testes?
The testes produce sperm and the male sex hormone testosterone.
Practice Question 12
What is the role of the ovaries?
The ovaries produce ova and female sex hormones such as
oestrogen and progesterone.
Reasoning-Based Practice
Practice Question 13
Why does sexual reproduction generally create more variation
than asexual reproduction?
Sexual reproduction combines genetic material from two
gametes, creating new combinations of genetic information.
Practice Question 14
Why are vegetatively propagated plants often genetically
similar to the parent plant?
Vegetative propagation is asexual reproduction and does not
involve fusion of gametes, so the offspring generally retain
the parent's genetic makeup.
Practice Question 15
Why is the uterus important during pregnancy?
The embryo implants in the uterine lining and continues
developing there during pregnancy.
Practice Question 16
Why are reproductive health and awareness important?
They help maintain reproductive well-being, support
prevention of infections and encourage informed and
responsible reproductive decisions.
Competency-Based Practice
Practice Question 17
An organism produces two daughter individuals from one parent
cell without fusion of gametes. Identify the process.
Binary fission, an asexual reproductive process.
Practice Question 18
A pollen grain lands on the stigma. What should happen next
before fertilisation?
The pollen grain should germinate and form a pollen tube that
grows towards the ovule so that the male gamete can reach
the female gamete.
Practice Question 19
A developing embryo attaches to the uterine lining. Identify
the process and explain its significance.
The process is implantation. It establishes attachment of
the embryo to the uterine lining and supports continued
development.
Practice Question 20
A couple wants to prevent pregnancy and also reduce the risk
of sexually transmitted infections. Which general category
of contraception is relevant?
Barrier methods are relevant because they can help prevent
sperm from reaching the ovum and some barrier methods can
also reduce the risk of transmission of certain STIs when
used correctly.
Quick Revision Before PYQs
-
Importance of reproduction and variation.
-
Asexual reproduction and its major methods.
-
Vegetative propagation.
-
Sexual reproduction in flowering plants.
-
Pollination and fertilisation.
-
Male and female reproductive systems.
-
Ovulation, fertilisation and implantation.
-
Reproductive health and contraception.
-
Sexually transmitted infections and prevention.