Tag: modes of reproduction

Questions Related to modes of reproduction

Fusion of a male gamete with egg in embryo sac is

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Autogamy

  2. Syngamy

  3. Double fertilization

  4. Triple fusion

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Correct Option: B
Explanation:

Syngamy and triple fusion are two events of sexual reproduction in plants. Syngamy is the fusion of one of the male gamete with the egg cell to produce a zygote while In triple fusion, second male gamete fuses with two polar nuclei to produce primary endosperm nucleus.

Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double Fertilisation.
So, the correct answer is 'Syngamy'.

The phenomenon of endogamy is reported in

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Fasciola

  2. Earthworm

  3. Marchantia

  4. Rabbit

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Correct Option: A
Explanation:

Fasciola is a genus of trematodes. It is commonly known as liver fluke. It shows the phenomena of endogamy where the two fusing gametes are derived from the same parent which means the gametes are uniparental. These are hermaphrodite and has both male and female reproductive organs. The male and female reproductive organs open up into the same chamber within the body, which is called the genital atrium where the two gametes fuses.

So, the correct answer is option A.

The type of syngamy in Trichonympha is

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Hologamy

  2. Anisogamy

  3. Isogamy

  4. Conjugation

Show answer
Correct Option: A
Explanation:

The process of fusion between the haploid male nucleus and egg nucleus is known as amphimixis. It is also known as syngamy. It leads to the formation of a diploid zygote. The form of sexual reproduction in which the gametes are of the same size and structure as the somatic cells. Trichonympha lives in the intestine termite species and helps them to break the cellulose which they take from the wood. They produce similar haploid gametes known as zooflagellates so it is classified as hologamy.

So, the correct answer is option A.

Fertilisation was first discovered by

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Aristotle

  2. Leeuwenhoek

  3. Harvey

  4. Pander

Show answer
Correct Option: A
Explanation:

Fertilization is the fusion of male and female gametes. In animals, it was first discovered by Aristotle. In plants, it was discovered by Nawaschin.

Which of the following is incorrect about fertilization?

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. It restores diploid condition.

  2. It activates egg.

  3. There is no variation.

  4. It determines sex of offspring.

Show answer
Correct Option: C
Explanation:

As the sperm reaches ovum to fertilize it, the ovum gets activated and completes its second meiotic division. After fertilization, a diploid zygote is formed. Fertilization also helps in determining the sex of the offspring. On the one hand, it leads to inherent qualities of a parent and on the other hand, it is the means for variations among the populations.

So, the correct option is 'There is no variation'.

Union between a large non-motile female gamete and a small motile male gamete is called ____________.

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Anisogamy

  2. Isogamy

  3. Oogamy

  4. Zoogamy

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Correct Option: A

Male and female, both gametes arise from the same parent in

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Rabbit

  2. Humans

  3. Taenia

  4. None of the above

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Correct Option: C
Explanation:
A. Rabbit is a monosexual animal. Male gametes are produced by male rabbit and female gametes are produced by a female rabbit.
B. In humans, females produce eggs and males produce sperms. These gametes fuse to produce a new organism. 
C. Taenia, commonly known as Tapeworm, is a hermaphrodite organism. Each segment of a tapeworm, which is known as proglottid, consists of male and female reproductive systems.
Hence, both male and female gametes arise from the same parent in Taenia, as it is a hermaphrodite. So, the correct answer is 'taenia'.

Select the wrong statement

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Isogametes are similar in structure, function and behavior

  2. Anisogametes differ either in structure, function and behavior

  3. In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

  4. Chlamydomonas exhibits both isogamy and 1, anisogamy and Fucus shows oogamy

Show answer
Correct Option: A
Explanation:

  • An isogamete is a gamete that is indistinguishable in size and form from the other gametes. The sex i.e, the male and female have also exhibited no difference.  It is found in algae and fungi. 

So, the correct option is 'Isogametes are similar in structure, function, and behavior'.

A sexual reproduction by fragmentation takes place in-

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Amoeba

  2. Yeast

  3. Spirogyra

  4. Moss

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Correct Option: C

Which of the following is correct about  internal fertilization and external fertilization?

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Internal fertilization- Fertilization inside the female body, External fertilization- Fertilization outside the female body.

  2. Internal fertilization- Fertilization outside the female body, External fertilization- Fertilization inside the female body.

  3. Internal fertilizatlon- Chances of the survival of the offspring are more, External fertilization- Chances of survival of the offspring are less.

  4. Both A and C

Show answer
Correct Option: D
Explanation:

Internal fertilization occurs inside the body whereas external fertilization happens outside the body.
External fertilization requires the presence of water for the sperm to be able to unite with the egg. Large number of offspring are produced but the chances of survival is very less.
With internal fertilization, the presence of water is not needed. Fewer young ones are produced because the mother's body will protect any fertilized eggs from being devoured by predators, so chances of survival is high.
Thus, the correct answer is option (D), 'Both A and C.'