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Sexual Reproduction in Flowering Plants · Question 103

AIPMT 2007MCQMedium📈 Topic in 50% papers+4−1
1

Which one of the following is surrounded by a callose wall?

  1. Male gamete
  2. Egg
  3. Pollen grain
  4. Microspore mother cell

Answer

(4) Microspore mother cell

Solution

Before meiosis, each microspore mother cell (pollen mother cell) secretes a thick wall of callose (a -1,3-glucan) around itself.

This callose wall isolates the cell and later surrounds the microspore tetrad; it is dissolved by callase to free the microspores.

Pollen grains have a sporopollenin exine and a pectocellulosic intine, not a callose wall.

∴ The microspore mother cell is surrounded by a callose wall.

Answer: (4)

AIPMT 2007

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2

Long filamentous threads protruding at the end of a young cob of maize are

  1. hairs
  2. anthers
  3. styles
  4. ovaries
AIPMT 2006
3

In a cereal grain the single cotyledon of embryo is represented by

  1. coleoptile
  2. coleorhiza
  3. scutellum
  4. prophyll.
AIPMT 2006
4

The arrangement of the nuclei in a normal embryo sac in the dicot plants is

  1. 3 + 3 + 2
  2. 2 + 4 + 2
  3. 3 + 2 + 3
  4. 2 + 3 + 3
AIPMT 2006
5

In a type of apomixis known as adventive embryony, embryos develop directly from the

  1. nucellus or integuments
  2. zygote
  3. synergids or antipodals in an embryo sac
  4. accessory embryo sacs in the ovule.
AIPMT 2005
6

Which one of the following represents an ovule, where the embryo sac becomes horse-shoe shaped and the funiculus and micropyle are close to each other?

  1. Amphitropous
  2. Circinotropous
  3. Atropous
  4. Anatropous
AIPMT 2005
7

Through which cell of the embryo sac, does the pollen tube enter the embryo sac?

  1. Egg cell
  2. Persistent synergid
  3. Degenerated synergids
  4. Central cell
AIPMT 2005
8

When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is

  1. tetraploidy
  2. pentaploidy
  3. diploidy
  4. triploidy
AIPMT 2004
9

An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the funicle is

  1. hemitropous
  2. campylotropous
  3. anatropous
  4. orthotropous.
AIPMT 2004
10

Anthesis is a phenomenon which refers to

  1. reception of pollen by stigma
  2. formation of pollen
  3. development of anther
  4. opening of flower bud.
AIPMT 2004
11

In a flowering plant, archesporium gives rise to

  1. only the wall of the sporangium
  2. both wall and the sporogenous cells
  3. wall and the tapetum
  4. only tapetum and sporogenous cells.
AIPMT 2003

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