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Sexual Reproduction in Flowering Plants · Question 46

NEET 2017MCQEasy📈 Topic in 12% papers+4−1
1

A dioecious flowering plant prevents both

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

Answer

(1) autogamy and geitonogamy

Solution

In a dioecious plant, male and female flowers are borne on different plants.

⇒ Pollen cannot reach the stigma of the same flower (autogamy) or of another flower on the same plant (geitonogamy).

As per NCERT, dioecy prevents both autogamy and geitonogamy; only xenogamy (cross-pollination) is possible.

Answer: (1)

NEET 2017

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2

Double fertilisation is exhibited by

  1. algae
  2. fungi
  3. angiosperms
  4. gymnosperms
NEET 2017
3

The coconut water from tender coconut represents

  1. free nuclear proembryo
  2. free nuclear endosperm
  3. endocarp
  4. fleshy mesocarp.
NEET 2016 (Phase 1)
4

Which one of the following statements is not true?

  1. Pollen grains of many species cause severe allergies.
  2. Stored pollen in liquid nitrogen can be used in the crop breeding programmes.
  3. Tapetum helps in the dehiscence of anther.
  4. Exine of pollen grains is made up of sporopollenin.
NEET 2016 (Phase 1)
5

Seed formation without fertilisation in flowering plants involves the process of

  1. somatic hybridisation
  2. apomixis
  3. sporulation
  4. budding.
NEET 2016 (Phase 1)
6

Proximal end of the filament of stamen is attached to the

  1. placenta
  2. thalamus or petal
  3. anther
  4. connective.
NEET 2016 (Phase 1)
7

Which of the following statements is not correct?

  1. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
  2. Some reptiles have also been reported as pollinators in some plant species.
  3. Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
  4. Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers.
NEET 2016 (Phase 1)
8

In majority of angiosperms

  1. egg has a filiform apparatus
  2. there are numerous antipodal cells
  3. reduction division occurs in the megaspore mother cells
  4. a small central cell is present in that embryo sac.
NEET 2016 (Phase 2)
9

Pollination in water hyacinth and water lily is brought about by the agency of

  1. water
  2. insects or wind
  3. birds
  4. bats.
NEET 2016 (Phase 2)
10

The ovule of an angiosperm is technically equivalent to

  1. megasporangium
  2. megasporophyll
  3. megaspore mother cell
  4. megaspore.
NEET 2016 (Phase 2)
11

Match Column-I with Column-II and select the correct option using the codes given below –

  1. (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
  2. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
  3. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
  4. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
NEET 2016 (Phase 2)

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