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Science · 2025 · 5 marks
CBSE 2025 · Region 6 · Set 3 · Q35
(a) Name the method by which Amoeba and Leishmania reproduce. Write a major difference in the way they divide to produce new individuals. (b) What is…
(a)
Name the method by which Amoeba and Leishmania reproduce. Write a major difference in the way they divide to produce new individuals.
(b)
What is asexual reproduction ? Explain the process of budding in Hydra.
(c)
Give two methods used to grow rose and jasmine plants by vegetative propagation.
OR
(a)
Write one function each of the parts - (i) petals (ii) anther (iii) style and
(iv)
ovary of a bisexual flower.
(b)
Give one example each of a unisexual flower and a bisexual flower. Mention the changes which a flower undergoes after fertilization.
Marking-scheme solution
(a)
Binary Fission
Amoeba splits into two parts in any plane of the body
In Leishmania, division occurs in a definite orientation in relation to the structure.
(b)
Asexual reproduction is the process of producing new organisms from a single parent/without the involvement of sex cells or gamete
Budding:
A bud develops due to repeated cell division at one specific site.
These buds develop into tiny individuals and when they mature, they get detached from the parent body as new independent individuals. / or explanation through diagram
(c)
Layering and grafting
(a)(i)
Attract insects for pollination
(ii)
Produces pollen grains
(iii)
Provides the path through which the pollen tube grows and reaches the ovary (iv)Contains ovules which has an egg cell / female gamete
(b) Unisexual flower - Papaya / Watermelon Bisexual flower - Hibiscus / Mustard
Post fertilization changes:Zygote divides several times to form an embryo within the ovule.
Ovule develops a tough coat and changes into a seed.
Ovary grows rapidly and ripens to form a fruit.
Petals, sepals, stamens and style, etc. shrivel/dry and fall off
All How do Organisms Reproduce? questions2025 question paperNCERT solutions: How do Organisms Reproduce?Practice How do Organisms Reproduce? →
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.