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Sexual Reproduction in Flowering Plants · Question 107

AIPMT 2005MCQMedium📈 Topic in 12% papers+4−1
1

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.

Answer

(1) nucellus or integuments

Solution

As per NCERT, in many Citrus and Mango varieties some of the nucellar cells surrounding the embryo sac start dividing, protrude into the embryo sac and develop into embryos.

⇒ Such embryos arise directly from diploid sporophytic cells (nucellus or integuments), without gamete formation or fertilisation — this is adventive embryony.

Embryos from the zygote are sexual, and those from synergids or antipodals or from accessory embryo sacs arise inside a gametophyte (not adventive).

∴ In adventive embryony, embryos develop directly from the nucellus or integuments.

Answer: (1)

AIPMT 2005

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2

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
3

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
4

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
5

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
6

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
7

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
8

In angiosperms pollen tubes liberate their male gametes into the

  1. central cell
  2. antipodal cells
  3. egg cell
  4. synergids
AIPMT 2002
9

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
AIPMT 2002
10

What is the direction of micropyle in anatropous ovule?

  1. Upwards
  2. Downward
  3. Right
  4. Left
AIPMT 2002
11

Adventive embryony in Citrus is due to

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

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