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

Schizosaccharomyces octosporus shows

  1. haplodiplontic life cycle

  2. diplontic life cycle

  3. haplontic life cycle

  4. Both 1 and 2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Schizosaccharomyces octosporus, like many yeasts, spends the majority of its life cycle in the haploid state, undergoing meiosis immediately after zygote formation. This characterizes a haplontic life cycle.

Multiple choice

The life cycle of Spirogyra is

  1. haplontic

  2. diplo-haplontic

  3. haplo-diplontic

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

The life cycle of Spirogyra is haplontic type in which all stages of life cycle are haploid (n) except zygospore (2n).

Multiple choice

Which of the following organism reproduces by binary fission?

  1. Yeast

  2. Hydra

  3. Paramecium

  4. Amoeba
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The single-celled amoeba demonstrates a simple method of asexual reproduction i.e.binary fission. It divides in two parts by a process called binary fission, producing two smaller daughter cells. After a period of feeding and growth these two daughter cells will themselves divide in half.

Multiple choice

Hybridization through protoplast fusion is called

  1. crossing over

  2. emasculation

  3. asexual hybridization

  4. parasexual hybridization
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parasexual hybridization involves the fusion of protoplasts from different species or varieties to create a hybrid, bypassing the sexual cycle.

Multiple choice

Syngamy means

  1. fusion of similar spores

  2. fusion of dissimilar spores

  3. fusion of cytoplasms

  4. fusion of gametes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Syngamy is the process of fusion of two gametes (male and female) to form a diploid zygote during the process of fertilization.

Multiple choice

Gemmae are the asexual reproductive bodies of

  1. scarpenia

  2. lobularia

  3. marchantia

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

Gemmae are small, asexual reproductive structures found in gemma cups on the thallus of liverworts like Marchantia, which can grow into new plants.

Multiple choice

Which of the following phenomena is shown in the life cycle of Obelia?

  1. Alternation of generation

  2. Metamorphosis

  3. Neoteny

  4. Ecdysis

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

Obelia shows alternation of sexual and asexual phases. The asexual phase is represented by colony, while the sexual phase is medusa. These phases alternate in the life cycle of Obelia. This alternation between sexual and asexual phases is called metagenesis.

Multiple choice

Hybrid breakdown is failure of

  1. hybrid zygote to develop into offspring

  2. hybrid adult to produce fertile offspring

  3. fusion failure of ova and sperms of two species

  4. all the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hybrid breakdown is a post-zygotic reproductive isolation mechanism where the first-generation hybrids are viable and fertile, but the subsequent generations (F2 or backcrosses) are feeble or sterile. This prevents gene flow between the two parent species.