Tag: sexual reproduction in flowering plants

Questions Related to sexual reproduction in flowering plants

Through which cell of the embryo sac, does the pollen tube enter the embryo sac-

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Persistant synergid

  2. Egg cell

  3. Central cell

  4. Degenerated synergid

Show answer
Correct Option: D
Explanation:

The pollen tube enters the embryo sac through the micropylar end. It can enter directly through the synergid or can enter from between the egg cell and synergid.

The answer is D- Degenerated synergid. 
So the correct option is D.

The element known to be involved in the polarized growth of pollen tube is?

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Potassium

  2. Magnesium

  3. Sodium

  4. Calcium

Show answer
Correct Option: A

When pollen tube enters through microphyte, the process is called _______________.

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Porogamy

  2. Chalazogamy

  3. Mesogamy

  4. Apogamy

Show answer
Correct Option: A

When a dicot plant is infected by Agrobacterium tumefaciens, the T-DNA in Ti-plasmid induces the plant to produce?

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Growth hormones like auxins and cytokinins

  2. Growth inhibitors like absciscic acid

  3. Fatty acids

  4. Leghaemoglobin

Show answer
Correct Option: A
Explanation:

Agrobacterium tumefaciens is the causal agent of crown gall disease (the formation of tumours). It is a rod-shaped, Gram-negative soil bacterium. The plasmid of this bacterium is called Ti-plasmid, it shows T-DNA. This plasmid used to produce growth hormones like auxins and cytokinins.

So, the correct option is ‘Growth hormones like auxins and cytokinins’.

Length of pollen tube depends on the distance between

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Pollen grain and upper surface of stigma

  2. Pollen grain on upper surface of stigma and ovule

  3. Pollen grain in anther and upper surface of stigma

  4. Upper surface of stigma and lower part of style

Show answer
Correct Option: B
Explanation:

Length of pollen tube depends upon distance of pollen on stigma and ovule because after pollination pollen germinates and form pollen tube that reaches upto ovule in ovary and release male gamete to fuse with female gamete.

Mesogamy is

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Fusion of similar male and female gametes

  2. Fusion of morphologically different but physiologically similar gametes

  3. Entry of pollen tube through the integument

  4. None of the above

Show answer
Correct Option: C
Explanation:

There are various ways by which the pollen tube can reach embryo sac for pollination.

Porogamy is the condition when the pollen tube enters the ovule from the micropylar end. Chalazogamy is the condition of entering of pollen tube from chalaza. Mesogamy is when pollen tube enters via the integuments.
Fusion of male and female gametes refers to as fertilization or fusion of gametes.
So, the correct option is 'entry of the pollen tube through the integument'. 

What is the function of the filiform apparatus at the entrance into ovule?

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Guides pollen tube from synergid to egg

  2. Helps in the entry of pollen tube into a synergid

  3. Prevents entry of more than one pollen tube into a synergid

  4. Brings about opening of the pollen tube

Show answer
Correct Option: B
Explanation:
A fully developed typical or polygonum type of embryo sac is a large and oval structure consisting of 7 cells and 8 nuclei.
Egg apparatus- this is a group of 3 cells situated at the micropylar end. The centrally located cell is known as the egg cell. On its sides are present two synergids. An egg cell has a large vacuole at its upper end and a prominent nucleus near its lower end. Synergids show of filiform apparatus attached to the upper wall. It is known to attract and guide the pollen tube. Each of the synergies has a vacuole at its lower end and the nucleus at its upper end.

So, the correct option is 'Helps in the entry of the pollen tube into a synergid'.

What is the function of filiform apparatus in an angiospermic embryo sac?

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Guides pollen tube from synergid to egg

  2. Helps in the entry of more than one pollen tube into a synergid

  3. Prevents entry of more than one pollen tube into a synergid

  4. Brings about opening of the pollen tube.

Show answer
Correct Option: A
Explanation:

The function of filiform apparatus in an angiospermic embryo sac is to guide the entry of pollen tube from synergid to egg. The synergid cells present within the female gametophyte play a vital role in the reproduction process in angiosperm. The cell wall of synergid develops an extremely thick structure called the filiform apparatus at the micropylar end of the ovule.

So, the correct answer is 'Guides pollen tube from synergid to egg'.

The most common type of entry of pollentube into the ovule is

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Mesogamy

  2. Chalazogamyy

  3. Basigamy

  4. Porogamy

Show answer
Correct Option: D
Explanation:

Porogamy is the most common type in which the pollen tube enters the ovule through the micropyle. An example includes lily, etc. 

So the correct option is D.


Siphonogamy occurs in

botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

  1. Gymnosperms

  2. Monocots

  3. Dicots

  4. All of the above

Show answer
Correct Option: D