Tag: fertilization in organisms

Questions Related to fertilization in organisms

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

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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

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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.'

Fusion between a larger non-motile (static) female gamete and smaller motile male gamete is

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

  1. Isogamous

  2. Oogamous

  3. Anisogamous

  4. Homogamous

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Correct Option: B
Explanation:

Isogamy is the fusion of gametes that are similar in similar sizes. Anisogamy involves fusion of gametes that are dissimilar in sizes where both gametes are either motile or immobile.

In oogamy, female gamete is static while male gamete is small and motile.
So, the correct option is 'Oogamous'.

In oogamous reproduction,

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

  1. Both male and female gametes are motile

  2. Both gametes are product of division of protoplast

  3. Both male and female gametes are non-motile

  4. For male gametes protoplast divides but for female gamete it does not

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Correct Option: D
Explanation:

  • Oogamy is a system of sexual reproduction in which one gamete (called the egg) is large and nonmotile, while the other (called the sperm) is small and motile. Oogamy is a type of Anisogamy.
  • During Spermatogenesis, the protoplast of spermatogonium is equally divided into 4 spermatids while during oogenesis, ovum retains the bulk of protoplast and is minimally shared by Polar bodies.
So, the correct option is 'For male gametes protoplast divides but for female gamete it does not'.

Select the wrong statement :

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

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

  2. Isogametes are similar in structure, function and behaviour.

  3. Anisogametes differ either in structure, function or behaciour.

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

Show answer
Correct Option: B

Choose the correct answers from the alternatives given.
The principal embryonic membranes are

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

  1. Chorion and umbilicus

  2. Amnion and placenta

  3. Amnion and chorion

  4. Placenta and umbilicus

Show answer
Correct Option: C
Explanation:
The placenta is an ephemeral organ found only in eutherian mammals during gestation. Placenta is the only organ composed of cells derived from two different organisms i.e. from the fetus and the mother. The fetal membranes are chorion and amnion. The membranes from the uterine wall are deciduas basalis. It is the portion of the deciduas which is directly adjacent to conception at the implantation site. Decidua is a mucous membrane lining the uterus during pregnancy and it cast off during childbirth. After the implantation of the embryo, the uterine endometrium is called decidua. Thus the principal embryonic membranes are Amnion and chorion.
So the correct option is ' Amnion and chorion '.