Tag: asexual and sexual reproduction in plants

Questions Related to asexual and sexual reproduction in plants

Secondary nucleus formed by the fusion of two polar nuclei is also called

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Vegetative nucleus

  2. Definitive nucleus

  3. Generative nucleus

  4. Primary endosperm nucleus

Show answer
Correct Option: B
Explanation:
The secondary nucleus formed by the fusion of two polar nuclei is also called definitive nucleus. Vegetative nucleus and Generative nucleus are present in the young pollen grain when the Microspore divides mitotically to form a large vegetative cell and a small generative cell. Primary endosperm nucleus is formed by the fusion of male gamete with a diploid secondary nucleus.
So, the correct answer is B.

The most common type of ovule is

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Orthotropous

  2. Hemitropous

  3. Anatropous

  4. Campylotropous

Show answer
Correct Option: C
Explanation:
•Orthotropous ovule is the simplest and primitive type of ovule. In this type of ovule, micropyle, chalaza and funiculus lie in one vertical plane.
•Hemianatropous ovule- The body of ovule is turned through 90° and micropyle and chalaza lie in a straight line but funiculus is at right angle or 90° with both these two.
•Anatropous ovule is the most common type of ovules, which occurs in more than 80% of angiospermic families. The body of ovule is rotated by 180° and micropyle comes near to the funiculus. Chalaza and micropyle lie in the straight line but hilum is at 90° to micropyle.
•Campylotropous ovule- In this type of ovule, the length of funiculus becomes increased and it covers the whole ovule.
So, the correct answer is C.

Name the type of ovule in which hilum, chalazal and micropyle come to lie nearby.

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Campylotropous

  2. Amphitropous

  3. Both A and B

  4. Hemitropous

Show answer
Correct Option: C
Explanation:

• Campylotropous ovule- This type of ovule is similar to Anatropous ovule but the curvature is less than that of an anatropous ovule. Micropyle is near to the funiculus. Chalaza and micropyle lie in the straight line but hilum is at 90° to the micropyle.

• Amphitropous ovule- The body of ovule gets curved along with the embryo sac in such a way that it becomes horseshoe-shaped.
• Hemianatropous ovule- The body of ovule is turned through 90° and micropyle and chalaza lie in a straight line but funiculus is at a right angle or 90° with both these two.
Hence, it is in Campylotropous and Amphitropous ovule in which Hilum, chalaza, and micropyle come to lie nearby. 
So, the correct answer is C.

Archesporium of ovule is

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Single celled derived from nucellar epidermis

  2. Single celled derived from nucellar hypodermis

  3. Multicellular derived from nucellar epidermis

  4. Multicellular derived from nucellar hypodermis

Show answer
Correct Option: B
Explanation:

In the ovule or megasporangium, during the process of megasporogenesis, a hypodermal cell functions as a archesporium cell and becomes more prominent because of large size, denser cytoplasm and large nucleus. In tenuinucellate ovules, archesporial cell directly functions as megaspore mother cell while in crassinucellate ovules, archesporial cell divides periclinally to form an outer parietal cell and inner primary sporogenous cell that functions as megaspore mother cell.

Hence, a single hypodermal cell in the Nucellus functions as the archesporium.
So, the correct answer is B.

Ovule is inverted with body fused to funicle, micropyle lying close to hilum and facing the placenta. It is?

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Hemitropous

  2. Orthotropous

  3. Anatropous

  4. Campylotropous

Show answer
Correct Option: C
Explanation:

•Hemianatropous ovule- The body of ovule is turned through 90° and micropyle and chalaza lie in a straight line but funiculus is at right angle or 90° with both these two.

•Orthotropous ovule is the simplest and primitive type of ovule. In this type of ovule, micropyle, chalaza and funiculus lie in one vertical plane.
•Anatropous ovule is the most common type of ovules, which occurs in more than 80% of angiospermic families. The body of ovule is rotated by 180° and micropylar comes near to the funiculus. Chalaza and micropyle lie in the straight line but hilum is at 90° to micropyle. The body of ovule is fused to funiculus on one side, thus forming a ridge called Raphe.
•Campylotropous ovule- This type of ovule is very similar to the Anatropous ovule but the curvature is less than the Anatropous ovule.
Hence, the properties given in the question match those of Anatropous ovule.
So, the correct answer is C.

The body of ovule lies straight in continuation of funicle, with funicle chalazal and micropyle in straight line. The type of ovule is?

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Anatropous

  2. Orthotropus

  3. Hemitropous

  4. Amphitropous

Show answer
Correct Option: B
Explanation:
•Anatropous ovule is the most common type of ovules, which occurs in more than 80% of angiospermic families. The body of ovule is rotated by 180° and micropyle comes near to the funiculus. Chalaza and micropyle lie in the straight line but hilum is at 90° to the micropyle.
•Orthotropous ovule is the simplest and primitive type of ovule. In this type of ovule, micropyle, chalaza and funiculus lie in one vertical plane i.e. in a straight line.
•Hemianatropous ovule- The body of ovule is turned through 90° and micropyle and chalaza lie in a straight line but funiculus is at a right angle or 90° with both these two.
•Amphitropous ovule- Here, the body of ovule gets curved along with the embryo sac and it becomes horseshoe-shaped.
So, the correct answer is B.

Circinotropous ovule occurs in

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Opuntia

  2. Ranunculus

  3. Polygonum

  4. Cicer

Show answer
Correct Option: A
Explanation:
In Circinotropous ovule, the length of the funiculus becomes increased and so it covers the whole ovule. Circinotropous ovule is found in the family Cactaceae. Example, Opuntia.
Ranunculus has Hemianatropous ovule in which body of ovule is turned through 90° and micropyle and chalaza lie in straight line but funiculus is at 90° to both of these.
Polygonum has Orthotropous ovule in which micropyle, chalaza and funiculus lie in a straight line.
Cicer has Anatropous ovule in which body of ovule is rotated by 180° and micropyle comes near to funiculus. Chalaza and Micropyle are in straight line but hilum is at 90° to the micropyle.
So, the correct answer is A.

Body of the ovule is straight but at right angles to the funicle. It is

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Orthotropous

  2. Campylotropous

  3. Hemitropous

  4. Amphitropous

Show answer
Correct Option: C
Explanation:

•Orthotropous ovule is the simplest and primitive type of ovule. In this type of ovule, micropyle, chalaza and funiculus lie in one vertical plane.

•Campylotropous ovule- In this type of ovule, the length of funiculus becomes increased and it covers the whole ovule.
•Hemianatropous ovule- The body of ovule is turned through 90° and micropyle and chalaza lie in a straight line but funiculus is at right angle or 90° with both these two.
•Amphitropous ovule- The body of ovule gets curved along with the embryo sac in such a way that it becomes horseshoe-shaped.
Thus, in Hemianatropous ovule, the body of ovule is straight as it doesn't get curved and is turned to 90° such that it is at right angle to the funiculus.
So, the correct answer is C

Which is diploid structure?

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Pollen grains

  2. Egg

  3. Megaspore

  4. MMC

Show answer
Correct Option: D
Explanation:
•Pollen grains develop from microspores. Microspores are formed from the microspore mother cell. Microspore mother cell is diploid and undergoes meiosis to produce four haploid microspores which develop to form pollen grains. Hence, pollen grains are haploid.
•Egg is the female gamete present in the embryo sac. Egg cell is haploid and on fusion with male gamete produces a diploid zygote. Hence, egg is haploid.
•Megaspore is formed from the megaspore mother cell. Megaspore mother cell is diploid and undergoes meiosis to produce four haploid megaspores. Hence, megaspore is haploid.
•MMC or Megaspore Mother Cell is a diploid cell which develops in the Nucellus of the ovule. MMC undergoes meiotic division to produce four haploid megaspores out of which, only one remains functional and the other three degenerate.
Hence, only MMC is diploid and rest are haploid structures.
So, the correct answer is D.

The ovule of an angiospherem is technical equivalent to

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Megaspore

  2. Megasporangium

  3. Megasporophyll

  4. Megaspore mother cell

Show answer
Correct Option: B
Explanation:

The placentas consists an enlarged basal portion which is called as ovary bearing one or more ovules also called as integumented megasporangium.

So the correct option is 'Megasporangium'.