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Sexual Reproduction in Flowering Plants · Question 36

NEET (UG) 2019MCQEasy📈 Topic in 12% papers+4−1
1

What is the fate of the male gametes discharged in the synergid?

  1. One fuses with the egg, other(s) fuse(s) with synergid nucleus.
  2. One fuses with the egg and other fuses with central cell nuclei.
  3. One fuses with the egg, other(s) degenerate(s) in the synergid.
  4. All fuse with the egg.

Answer

(2) One fuses with the egg and other fuses with central cell nuclei.

Solution

As per NCERT, the pollen tube releases the two male gametes into the cytoplasm of the synergid.

⇒ One male gamete fuses with the nucleus of the egg cell (syngamy), forming the diploid zygote.

⇒ The other moves towards the two polar nuclei in the central cell and fuses with them (triple fusion), forming the triploid primary endosperm nucleus.

∴ One fuses with the egg and the other with the central cell nuclei (double fertilisation).

Answer: (2)

NEET (UG) 2019

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2

Which of the following has proved helpful in preserving pollen as fossils?

  1. Pollenkitt
  2. Cellulosic intine
  3. Oil content
  4. Sporopollenin
NEET 2018
3

Winged pollen grains are present in

  1. Mustard
  2. Cycas
  3. Mango
  4. Pinus
NEET 2018
4

Double fertilization is

  1. fusion of two male gametes of a pollen tube with two different eggs
  2. fusion of one male gamete with two polar nuclei
  3. fusion of two male gametes with one egg
  4. syngamy and triple fusion
NEET 2018
5

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

  1. Hydrilla
  2. Yucca
  3. Banana
  4. Viola
NEET 2018
6

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

  1. -120 C
  2. -80 C
  3. -196 C
  4. -160 C
NEET 2018
7

The morphological nature of the edible part of coconut is

  1. cotyledon
  2. endosperm
  3. pericarp
  4. perisperm
NEET 2017
8

Functional megaspore in an angiosperm develops into an

  1. endosperm
  2. embryo sac
  3. embryo
  4. ovule.
NEET 2017
9

Attractants and rewards are required for

  1. entomophily
  2. hydrophily
  3. cleistogamy
  4. anemophily.
NEET 2017
10

Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by

  1. bee
  2. wind
  3. bat
  4. water
NEET 2017
11

A dioecious flowering plant prevents both

  1. autogamy and geitonogamy
  2. geitonogamy and xenogamy
  3. cleistogamy and xenogamy
  4. autogamy and xenogamy.
NEET 2017

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All NEET Botany chapters
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