Biology

Biological Reproduction

762 Questions

Biological reproduction encompasses processes like asexual and sexual reproduction, alternation of generations, and specific mechanisms in plants and fungi. This topic is fundamental for biology paper preparation in various competitive exams. Practice these questions to solidify your understanding.

Asexual reproduction structuresPlant and fungi life cyclesCloning and fertilizationReproductive terminology

Biological Reproduction Questions

Multiple choice

Zygote is produced during

  1. sexual reproduction

  2. asexual reproduction

  3. vegetative propagation

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A zygote is a fertilized egg formed by the fusion of male and female gametes during sexual reproduction. This fusion is the defining characteristic of sexual reproduction. Asexual reproduction (budding, fission, etc.) and vegetative propagation do not involve zygote formation since they don't require gamete fusion.

Multiple choice

Sometimes, larve develops gonads and reproduces by normal sexual reproduction. It is called

  1. regeneration

  2. neoteny

  3. autotomy

  4. paedogenesis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Neoteny is the retention of larval characteristics in sexually mature adults, where the larva develops gonads and reproduces while still in larval form. Regeneration is regrowing lost parts. Autotomy is self-amputation (like lizards dropping tails). Paedogenesis is reproduction by larvae, but neoteny specifically describes the retention of juvenile features in adulthood.

Multiple choice

When male differs from female in morphology, it is called

  1. heterogamy

  2. homogamy

  3. sexual dimorphism

  4. hermaphroditism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sexual dimorphism is the condition where males and females of the same species show differences in size, appearance, or other morphological traits (like peacock feathers, lion manes). Heterogamy refers to mating between different types. Homogamy means mating between similar types. Hermaphroditism is having both male and female reproductive organs.

Multiple choice

In the sexual reproduction, there must be a union of

  1. one male and one female reproductive cell

  2. two male reproductive cells

  3. two female reproductive cells

  4. two male cells with two female reproductive cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sexual reproduction fundamentally requires the fusion of gametes from two parents. This means one male reproductive cell (sperm) must unite with one female reproductive cell (ovum/egg). Options involving two cells of the same sex or multiple cells of both sexes describe processes that don't occur in standard sexual reproduction.

Multiple choice

Endogamy (self fertilisation) is observed in

  1. ascaris

  2. earthworm

  3. taenia

  4. honeybee
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Taenia (tapeworm) is hermaphroditic and can practice self-fertilization. Ascaris has separate sexes, earthworms are hermaphroditic but typically cross-fertilize, and honeybees have separate sexes with complex reproductive systems.

Multiple choice

Most terrestrial animals reproduce by

  1. internal fertilisation

  2. external fertilisation

  3. dichogamy

  4. pollination
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Most terrestrial animals use internal fertilization to protect gametes from desiccation (drying out) in terrestrial environments. External fertilization is primarily an aquatic adaptation, while dichogamy and pollination are not standard modes of animal reproduction.

Multiple choice

Anisogamy means fusion of dissimilar gametes. It is found in

  1. man

  2. earthworm

  3. pila

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Anisogamy (fusion of morphologically different gametes) is found in humans (sperm and egg), earthworms (though they are hermaphroditic, they produce different sperm and egg types), and pila (apple snail). All these organisms produce distinct male and female gametes.

Multiple choice

Which of the following organisms reproduces asexually?

  1. Human

  2. Fungus

  3. Algae

  4. Animals

  5. Bacteria
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

In asexual reproduction, an individual can reproduce without involvement of another individual of that species. The division of a bacterial cell into two daughter cells is an example of asexual reproduction.

Multiple choice

Which of the following statements is/are false?

a. In the asexual reproduction method, certain body cells of the parent organism undergo repeated mitotic cell divisions to form two or more new organisms of the same kind. b. Humans, frogs, hens, etc. reproduce by the method of sexual reproduction. c. In binary fission, the parent organism splits to form many new organisms at the same time.

  1. Only a

  2. Both a and b

  3. Only c

  4. Both b and c

  5. Only b
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option. This is a wrong option as this statement is true.

Multiple choice

Match the following:

 
a. Fission 1. It is the process in which the parent plant produces hundreds of microscopic reproductive units.
b. Budding 2. It is the process in which a small part of the body of the parent organism grows out, which detaches and becomes a new organism.
c. Spore formation 3. It is the process in which a unicellular organism splits to form two or more new organisms.

  1. a - 3, b - 2, c - 1

  2. a - 3, b - 1, c - 2

  3. a - 2, b - 1, c - 3

  4. a - 2, b - 3, c - 1

  5. a - 1, b - 2, c - 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Fission is the process in which a unicellular organism splits to form two or more new organisms. Budding is the process in which a small part of the body of the parent organism grows out, which detaches and becomes a new organism. Spore formation is the process in which the parent plant produces hundreds of microscopic reproductive units.