Tag: vegetative propagation

Questions Related to vegetative propagation

In a grafted plant, stock has $48$ chromosomes while scion has $24$ chromosomes. The chromosome number for root cells and eggs are.

botany reproduction in angiospermic plants artificial vegetative propagation common modes of vegetative propagation vegetative propagation asexual modes of reproduction

  1. $48$ and $24$

  2. $24$ and $24$

  3. $24$ and $12$

  4. $48$ and $12$

Show answer
Correct Option: D
Explanation:

The stock is the plant part containing strong root system and sicon is the plant part which contains better fruit and fruit yield. In root cells, the chromosome number remains constant, reduced half in egg cell. So the chromosome number for root cells are 48 and eggs are 12.

So the correct option is '48 and 12'.

The technique of rapid vegetative propagation of plants of agricultural and horticultural value involving cell and tissue culture is popularly known as micropropagation.

botany reproduction in angiospermic plants artificial vegetative propagation common modes of vegetative propagation vegetative propagation asexual modes of reproduction

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Tissue culture is also called Micropropagation.  it  is a type of vegetative propagation for producing a large number of genetically superior and pathogen-free transplants in a limited time and space. Micropropagation is the practice of rapidly multiplying stock plant material to produce a large number of progeny plants, using modern plant tissue culture methods. Micropropagation is used to multiply plants such as those that have been genetically modified or bred through conventional plant breeding methods. It is also used to provide a sufficient number of plantlets for planting from a stock plant which does not produce seeds, or does not respond well to vegetative reproduction.

So the given statement is true.

Induction of rooting in stem cutting would be most beneficial in

botany reproduction in angiospermic plants artificial vegetative propagation common modes of vegetative propagation vegetative propagation asexual modes of reproduction

  1. Marchantia

  2. Wheat

  3. Cuscuta

  4. Bougainvillea

Show answer
Correct Option: D
Explanation:

Auxin is a plant hormone that is involved in various growth and developmental processes of plant. It stimulates the induction of rooting in stem cuttings. Bougainvillea plants are primarily propagated by stem cuttings. Hence, induction of rooting in stem cutting would be most beneficial in Bougainvillea.

Thus, the correct answer is option D.

Which of the following is not an example of the artificial propagation?

botany reproduction in angiospermic plants artificial vegetative propagation common modes of vegetative propagation vegetative propagation asexual modes of reproduction

  1. Fragmentation- the separation of plant parts to develop into whole plants

  2. Grafting- the attachment of a scion onto a stock plant that provides a root system

  3. Apomixis- the asexual reproduction of seeds

  4. Production of fruit without fertilization in parthenocarpic plants

Show answer
Correct Option: D
Explanation:

Artificial reproduction/propagation is the creation of a new life by other than the natural means available to an organism. The process of growing many plants from one plant by man-made methods is called artificial propagation of plants. A number of methods of artificial propagation of plants are used in agriculture.

Fragmentation- Fragmentation in multicellular organisms is a form of asexual reproduction in which an organism is split into fragments. Each of these fragments develops into matured, fully grown individuals that are identical to their parents.
Grafting- The cut stem of a plant having roots and fixed in the soil is called stock which is the lower part of a plant having the roots. The cut stem of another plant without is called 'scion' which is the upper part of a plant which may have left on it. The cut soon heals and the stock and scion of two plants grow together and become one plant.
Apomixis- Apomixis is defined as replacement of the normal sexual reproduction by asexual reproduction, without fertilization. Replacement of the seed by a plantlet or replacement of the flower by bulbils is categorized as types of apomixis.
Parthenocarpic plants: Parthenocarpy is the natural or artificially induced production of fruit without fertilization of ovules, which makes the fruit seedless. Parthenocarpy occasionally occurs as a mutation in nature.
So the correct option is 'production of fruit without fertilization in parthenocarpic plants'.