Reproduction in Organisms — Practice

Question 1

Differentiate between binary and multiple fission with examples.

Accepted Answer

Binary fission splits the parent into two individuals (Amoeba, Paramecium); multiple fission splits it into many simultaneously (Plasmodium).

Question 2

Why is vegetative propagation considered asexual reproduction?

Accepted Answer

It involves a single parent and produces new plants from vegetative parts without gamete fusion, so the offspring are genetically identical clones.

Question 3

Give two advantages of sexual over asexual reproduction.

Accepted Answer

It produces genetic diversity, enabling adaptation to changing environments, and recombination helps eliminate harmful mutations more effectively.

Question 4

Name the mode of reproduction in Hydra, Rhizopus, Spirogyra, and Planaria.

Accepted Answer

Hydra: budding; Rhizopus: spore formation; Spirogyra: fragmentation; Planaria: fragmentation/regeneration.

Question 5

Differentiate between external and internal fertilisation.

Accepted Answer

External fertilisation occurs outside the body in water (fish, frogs) and needs many gametes; internal fertilisation occurs inside the female body (humans, birds) with fewer gametes and more parental care.

Practice — Reproduction in Organisms

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