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Sexual Reproduction in Flowering Plants · Question 115

AIPMT 2002MCQHard📈 Topic in 50% papers+4−1
1

In angiosperms all the four microspores of tetrad are covered by a layer which is formed by

  1. pectocellulose
  2. callose
  3. cellulose
  4. sporopollenin

Answer

(1) pectocellulose

Solution

As per NCERT, the microspore mother cells undergo meiotic divisions to form clusters of four cells — the microspore tetrads.

⇒ The four microspores of a tetrad remain enclosed together within the original wall of the microspore mother cell, which is pectocellulosic in nature (callose is deposited only as an inner layer around the individual microspores and is later dissolved).

∴ The common layer covering all the four microspores of the tetrad is formed by pectocellulose.

Note: sporopollenin forms the exine of the mature pollen grain, not the covering of the tetrad.

Answer: (1)

AIPMT 2002

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2

What is the direction of micropyle in anatropous ovule?

  1. Upwards
  2. Downward
  3. Right
  4. Left
AIPMT 2002
3

Adventive embryony in Citrus is due to

  1. nucellus
  2. integuments
  3. zygotic embryo
  4. fertilized egg.
AIPMT 2001
4

In grasses what happens in microspore mother cell for the formation of mature pollen grains?

  1. One meiotic and two mitotic divisions
  2. One meiotic and one mitotic divisions
  3. One meiotic division
  4. One mitotic division
AIPMT 2001
5

Anemophily type of pollination is found in

  1. Salvia
  2. bottle brush
  3. Vallisneria
  4. coconut.
AIPMT 2001
6

Hair found in the inflorescence of Zea mays are the modification of

  1. style
  2. stigma
  3. spathe
  4. filaments.
AIPMT 2000
7

Endosperm is formed during the double fertilization by

  1. two polar nuclei and one male gamete
  2. one polar nucleus and one male gamete
  3. ovum and male gamete
  4. two polar nuclei and two male gametes
AIPMT 2000
8

Eight nucleated embryo sac is

  1. only monosporic
  2. only bisporic
  3. only tetrasporic
  4. any of these.
AIPMT 2000

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