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Standard XII
Botany
Question

Which of the following statement is not correct?
  1. 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.
  2. Insects that consumes pollen or nectar without bringing about pollination are called pollen/nectar robbers.
  3. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
  4. Some reptiles have also been reported as pollinators in some plant species.

A
Insects that consumes pollen or nectar without bringing about pollination are called pollen/nectar robbers.
B
Some reptiles have also been reported as pollinators in some plant species.
C
Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
D
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.
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Solution
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Pollination refers to the landing and subsequent germination of the pollen on the stigma. The arrival of a viable pollen grain on a receptive stigma does not guarantee fertilization. Interspecific incompatibility refers to the failure of pollen from one species to germinate and/or grow on the stigma of another species. Intraspecific incompatibility is incompatibility that occurs within a species. Self-incompatibility—incompatibility between the pollen and the stigmas of the same individual. If the pollen and the stigma are compatible, the pollen takes up water (hydrates) and the pollen tube emerges. The pollen tube grows down the style of the carpel toward the micropyle.

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Q1

The pollen grain fallen on stigma starts germinating pollen tube to rich ovules. what is it called?

pollination or somthing else?

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Q2

Pollen grains germinate only if it falls on the stigma of the same plant species or else it disintegrates.


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Q3
Which of the following is an outbreeding device?

a. If pollen release and stigma receptivity are not synchronized.

b. If the anther and stigma are placed at different positions so that pollen cannot come in contact with the stigma of the same flower.

c. Self-incompatibility which prevents self-pollen (from the same plant) from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.

d. Production of the unisexual flower.
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Q4
Can a pollen grain still germinate if it deposits on the stigma of plant belonging To different species
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Q5

Which of the following statements is/are correct for hydrophily?

(i) Pollination by water is rare in flowering plants and is limited mostly to monocotyledons.

(ii) In majority of aquatic plants such as water hyacinth and water lily pollination takes place by insects and winds.

(iii) In most of the water pollinated species pollen grains are protected from getting wet by a mucilaginous covering.

(iv) In Vallisneria, female flowers reach the surface of water and receive the pollen grains, whereas in Zostera, female flowers remain submerged and receive pollen grains under water.


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