Tag: botany

Questions Related to botany

For union between stock and scion in grafting which one is the first to occur.

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

  1. Formation of callus

  2. Production of plasmodesmata

  3. Differentiation of new vascular tissues

  4. Regeneration of cortex and epidermis

Show answer
Correct Option: A
Explanation:

The process of joining of a tissue or a small part into the tissues of another plant is called Grafting. The tissue or part inserted is called stock and the plant into which foreign part is inserted is called scion. During this process, a group of cells are formed initially. It is called callus.

So, the correct option is ‘Formation of callus’.

Stem takes part in storage and perennation in

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

  1. Wheat

  2. Groundnut

  3. Radish

  4. Ginger

Show answer
Correct Option: D

Vegetative reproduction of Agave occurs through

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

  1. Rhizome

  2. Stolon

  3. Bulbils

  4. Sucker

Show answer
Correct Option: C

Grafting is a method of

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

  1. Artificial vegetative propagation

  2. Sexual reproduction

  3. Artificial pollination

  4. Cross-pollination

Show answer
Correct Option: A
Explanation:

Grafting is an artificial propagation technique in which tissue from one plant, the scion, is attached to another, the rootstock. The rootstock produces new vascular tissue with which to feed scion the graft heals itself.

Hence, the correct answer is 'Artifical 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'.

It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the

botany heredity: from parents to offsprings experiments of mendel mendel's law of inheritance works of mendel

  1. Results of $F _3$ generation of a cross

  2. Observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending

  3. Self pollination of $F _1$ offsprings

  4. Cross pollination of $F _1$ generation with recessive parent

Show answer
Correct Option: B
Explanation:

Mendel crossed two parent plants having contrasting characters. He found that in the first filial generation, F1 generation, the dominant of the two expressed while the recessive is suppressed. Apart from this,  When the f1 generation is self crossed, in the F2 generation, these recessive characters appear again. Therefore, it is not that they have disappeared. 

So, option B is the correct answer.

Which of these is not a part of Mendel's laws

botany unravelling genetic mysteries experiments of mendel mendel's law of inheritance works of mendel

  1. Law of independent assortment

  2. Law of segregation

  3. Law of dominance

  4. Law of linkage

Show answer
Correct Option: D
Explanation:

Linkage is the tendency of two or more genes to inherit together as a pair and not to sort out independently.
Thus, linkage is not applicable according to Mendelian principles.
Linkgae is strictly against Law of independent assortment where Mendel explains that the characters are sorted out independently while forming gametes.