Tag: botany

Questions Related to botany

A quicker regeneration of grass leaves shall occur by

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

  1. Cutting

  2. Grazing

  3. Irrigation

  4. Clipping

Show answer
Correct Option: D
Explanation:

Grass possess intercalary meristem at the base of the leaf blades. Intercalary meristems are capable of cell division, and they allow for rapid growth and regrowth of many monocots. In grass the meristem allows the damaged leaves to grow rapidly. Therefore, clipping of leaves at the base helps in quicker regeneration of grass leaves.

Thus, the correct answer is option D.

Grafting is not possible in monocots as they

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

  1. Lack cambium.

  2. Are herbacous.

  3. Have scattered vascular bundles.

  4. Have parallel venation.

Show answer
Correct Option: A
Explanation:

Grafting is a horticulture technique where the living detached portion of the plant is used to regenerate the growth. One plant is selected for its roots and this is called the stock or rootstock. The other plant is selected for its stems, leaves, flowers, or fruits and is called the scion. The joining of scion and stalk is known as inosculation. 

Grafting is not possible in monocots as they lack cambium and the joining of vascular tissues between the scion and rootstock do not take place.
So, the correct answer is option A.

Which one of the following is not a natural method of vegetative propagation

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

  1. Runner

  2. Foliar buds

  3. Stem tuber

  4. Grafting

Show answer
Correct Option: D
Explanation:
Runner, foliar bud, and stem tuber is a natural method of propagation while grafting is an artificial method as because the two plants of different species are allowed to merge by artificial technique.
A runner is the stem portion of the plant that tends to grow horizontally as opposed to upright like the main stem. The end tip of the runner can produce buds that develop into new plants that are clones. Adventitious roots are also produced from the buds found on the runner. An offset is a short thick runner like branch which produces a new plant at its tip. The offsets grow in all directions from the main stem of the parent plant. 
Foliar buds are the buds which are present other than the node generally on the leaf. Plants like Begonia are propagated by the foliar bud.
Tubers are the underground modification of stem which stores starch. It has buds on its surface which help in the growth of the new plant as this buds are meristematic in nature. The buds are also known as eye. 
Grafting is not a natural method of vegetative propagation. It is a horticulture technique where the living detached portion of the plant is used to regenerate the growth. One plant is selected for its roots and this is called the stock or rootstock. The other plant is selected for its stems, leaves, flowers, or fruits and is called the scion. The joining of scion and stalk is known as inosculation.
So, the correct answer is option D.

Artificial vegetative propagation of mango varieties such as Dussehri and Alphanso is carried out through

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

  1. Bud grafting

  2. Scion grafting

  3. Mound layering

  4. Aerial layering

Show answer
Correct Option: A

Some leaves are removed from the stem cuttings planted for vegetative propagation. This is done

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

  1. To increase water uptake

  2. Because it helps in rooting of cuttings

  3. To reduce water loss

  4. Because the cuttings need less food

Show answer
Correct Option: C
Explanation:

A few leaves from the stem cutting are removed so as to reduce transpiration which inturn will reduce the water stress on the stem cutting and would help in faster rooting.

So, the correct answer is 'To reduce water loss'

Which of the following methods is used to produce new rose plants?

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

  1. Layering

  2. Bud grafting

  3. Budding

  4. Stem cutting

Show answer
Correct Option: D
Explanation:

Rose plant is cultivated by stem cutting. This is an asexual method of reproduction. Good stems are selected and dipped in auxin hormone that promotes root formation. These stems are then planted in a medium to obtain plants that are genetically identical to the parent plant. Thus the correct answer is option D.

The best way to obtain bacterial and viruses free plants through tissue culture

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

  1. Micropropagation

  2. Seed germination after gamma-irradiation

  3. Stem or Shoot up culture

  4. Seed germination under aseptic condition

Show answer
Correct Option: A
Explanation:

Tissue culture is the artificial growth of cells in a large amount in laboratory conditions. Micropropagation is one of the techniques of tissue culture in which a large number of desired cells are produced to obtain pathogen free bacteria and also small pieces of shoot meristems are cut and then transferred to culture media to grown, the resultant plants will be free from virus and bacterial infection. The media and surrounding should be sterilized and aseptic conditions should be maintained.

So , correct option is ' Micropropagation ' .

Which of the following cannot serve as a vegetative propagule?

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

  1. A piece of potato tuber with eyes

  2. A middle piece of sugarcane internode

  3. A piece of ginger rhizome

  4. A marginal piece of Bryophyllum leaf

Show answer
Correct Option: B
Explanation:
Vegetative propagation is a mode of asexual reproduction in which new offspring is obtained from the vegetative parts of the plant, such as runners, rhizomes, tubers, etc. These structures are known as vegetative propagules. 
Node is the vegetative propagule in sugarcane. 
So, the correct option is 'A middle piece of sugarcane internode'. 

Grafting is the union between two plants of closely related varieties. Following are some statements regarding different types of grafting
(i) An oblique cut followed by a notch is given to both stock and scion.
(ii) Scion is a bud with a small piece of bark and cambium.
(iii) Both stock and scion are of the same diameter.
(iv) The stock has many times more diameter than Scion.
Identify the type of grafting with respect to these statements and select the correct option.

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

  1. (i) can be tongue grafting in which diameter of stock is larger than that of scion

  2. (ii) can be bud grafting in which stock of monocot and scion of dicot plant are usually united

  3. (iii) can be wedge grafting in which v-shaped notch is given to stock whereas wedge like cut is given to scion

  4. (iv) can be crown grafting in which many stocks are inserted in the slits made in the scions

Show answer
Correct Option: C
Explanation:

In the tongue grafting, an oblique cut followed by a notch is given to both the stock as well scion. The two perfectly fit upon one another, they are tied together. Stock and scion are of the same diameter. In bud grafting, the scion is a bud with a small piece of bark and cambium. Monocots do not possess cambium, thus the two plants taken can be dicots only. In wedge grafting, the V-shaped notch is given to stock while the wedge-like cut is given to Scion. Both are also of the same diameter. In crown grafting, many scions are selected and shaped at the base to form a wedge. Many slits are formed on the sides of the stock. Scions are inserted in the slits and bandaged. The stock has a large diameter than Scion.

By which of the following method reproduction hybrids can be produced?

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

  1. Cutting

  2. Grafting

  3. Layering

  4. None of these

Show answer
Correct Option: B
Explanation:

Grafting technique can be used to produce hybrids. In grafting, the vegetative parts of two plants are joined and allow to grow as a single plant. In grafting, the upper (shoot) portion of one plant is allowed to grow on the lower (root) portion of another plant. This process results in the formation of new hybrids.