Free Sexual Reproduction In Flowering Plants (Daily Quiz: 5) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Free Sexual Reproduction In Flowering Plants (Daily Quiz: 5) Time:

Question-1

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called

(a)

(b)

(c)

(d)


Question-2

Single megasporic development is called

(a)

(b)

(c)

(d)


Question-3

From the statements given below choose the option that are true for a typical female gametophyte of a flowering plant.
  1. It is eight-nucleate and seven-celled at maturity.
  2. It is free-nuclear during the development.
  3. It is situated inside the integument, but outside the nucellus.
  4. It has an egg apparatus situated at the chalazal end.

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

Inside the nucellus, the female gametophyte of embryosac is located and enclosed within the integuments. In a majority of flowering plants, one of the megaspore is functional while the other three degenerates. Three repeated mitotic divisions of the functional megaspore results in the formation of seven-celled or eight-nucleate embryo sac.

Six of the eight nuclei are organised at the two poles. Three cells grouped at micropylar end forms egg-apparatus and 3 at the chalazal end forms antipodal cells.

The large central cell at the centre has two polar nuclei. In the formation of embryo sac the meiotic divisions are strictly free nuclear, i.e nuclear divisions are not followed immediately by cell-wall formation. Gametophyte is situated at micropylar end not at chalazal end.


Question-4

Product of sexual reproduction generally generates

(a)

(b)

(c)

(d)

Explanation:

Answer: (a)

Sexual reproduction always involves meiosis (zygotic in case of haploid individuals and gametic in case of diploid individuals). Meiosis results in crossing over between chromosomes during prophase I generating new recombinations. Besides, sexual reproduction generally involves combination of genes from two different organisms. Thus, sexual reproduction generates new genetic combinations leading to variations.


Question-5

In a fertilized embryo sac, the haploid, diploid and triploid structures are

(a)

(b)

(c)

(d)


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