Hydrophily

Q.

In water hyacinth and water, lily pollination takes place by

1. Wind And Water

2. Insects Or Wind

3. Insects And Water

4. Water Currents Only.

Q. Explain the process of pollination in Vallisneria. How is it different in water-lily, which is also an aquatic plant? [3]

Q. How tapetal cells could become bi-nucleate?

Q.

What are the characteristic features of wind pollinated flowers?

Q.

Photoperiod affects reproduction in seasonal breeders in both plants and animals why

Q.

How do insects help in pollination?

Q.

Pollination in the Hydrilla plant is by the wind.

1. True
2. False

Q. Which is generally not a characteristic of anemophilous flower?

1. Unisexual nature
2. Abundant pollen grains
3. Bright coloured
4. Reduction in no. of sepals, petals and ovules

Q. Which of the following is not true about water pollinated flowers?

1. The flowers are brightly coloured and produce nectar.
2. In most of the water-pollinated species, pollen grains are protected from wetting by a mucilaginous covering.
3. Examples of water pollinated plants are Vallisneria and Hydrilla
4. In seagrasses, pollen grains are long, ribbon-like and are carried passively inside the water.

Q. (a) Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.

(b) Draw the diagram of a pistil where pollination has successfully occurred. Label the parts involved in reaching the male gametes to its desired destination. [3]

Q.

Why are pollen grains produced in enormous quantity in maize?

Q. Pollen grains from which of the following plants have a higher probability of having a mucilaginous covering?

1. Sunflower
2. Sweet pea
3. Hydrilla
4. Water hyacinth

Q. Examples of water pollinated flowers are

1. Zostera, Lotus, Water lily
2. Lotus, Vallisneria, Hydrilla
3. Potamogeton, Vallisneria, Lotus
4. Vallisneria, Hydrilla, Zostera

Q.

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

1. Insects or wind

2. Bats

3. Water

4. Birds

Q. Which of the following could be a possible reason for the limited distribution of some bryophytes and pteridophytes?

1. Sporogenesis
2. Thalloid structure
3. Aquatic reproduction
4. Alternation of generation

Q. Based on the given excerpt, answer the given question.

Stamen is regarded as a microsporophyll that possesses microsporangia which have microspore mother cells that give rise to microspores. The cells of sporogenous tissues undergo meiotic division to form microspore tetrad. Microspore is present in the bilobed structure called anther. A male gametophyte is a gamete producing haploid phase in a plant. In angiosperms, it is the pollen grains that are regarded as gametophytes.

A dithecous anther is __________.
[1 mark]

1. unisporangiate
2. bisporangiate
3. trisporangiate
4. tetrasporangiate

Q.

Give any two characteristics of flowers pollinated by wind.

Q. Examples of water pollinated flowers are

1. Lotus, Vallisneria, Hydrilla
2. Vallisneria, Hydrilla, Zostera
3. Zostera, Lotus, Water lily
4. Potamogeton, Vallisneria, Lotus

Q.

Epihydrophily is found in

1. tape grass
2. sea grass
3. lotus
4. lily

Q.

All hydrophilous plants are hydrophytes, but all hydrophytes are not hydrophilous.

1. True

2. False

Q. Which statements among the following are true?

i. Water pollinated plants are Vallisneria, water lily, Zostera.
ii. Water pollination is mostly found in monocots and only in very few dicots.
iii. Majority of floating aquatic plants are insect or wind pollinated.
iv. Water pollinated plants produce nectar.

1. i and ii
2. ii and iii
3. iii and iv
4. i and iv

Q. Select the plants pollinated by water.
(a) Water Hyacinth
(b) Zostera
(c) Amorphophallus
(d) Vallisneria
(e) Yucca.

1. a, d and e
2. b and e
3. b and d
4. a, b and d
5. b, c, d

Q. How many of the following statements is/are correct?

1. In Equisetum, the female gametophyte is retained on the parent sporophyte.
2. In Ginkgo, male gametophyte is not independent.
3. The sporophyte in Riccia is more developed than that in Polytrichum.
4. Sexual reproduction in Volvox is isogamous.

1. 1
2. 2
3. 3
4. 4

Q.

1. Vallisneria/ Zostera
2. Nymphaea
3. Eichhornia crassipes
4. Nelumbo

Q.

Regarding assertion and reason, select the right opton.

Assertion (A): Plants pollinated by abiotic agents produce enormous amount of pollen when compared to plants pollinated by biotic agents.

Reason(R): Pollen grains coming in contact with stigma is a chance factor in anemophily and hydrophily.

1. A and R are correct and R explains A

2. A is true and R is false

3. Both A and R are incorrect

4. Both A and R are incorrect

Q. Based on the given excerpt, answer the given question.

Stamen is regarded as a microsporophyll that possesses microsporangia which have microspore mother cells that give rise to microspores. The cells of sporogenous tissues undergo meiotic division to form microspore tetrad. Microspore is present in the bilobed structure called anther. A male gametophyte is a gamete producing haploid phase in a plant. In angiosperms, it is the pollen grains that are regarded as gametophytes.

Endothecium is responsible for ______________ of pollen grains.

i) nutrition
ii) protection
iii) dehiscence
[1 mark]

1. i
2. i and ii
3. ii and iii
4. ii only

Q. A characteristic of wind pollinated flowers is

1. Feathery exserted stigma
2. Feathery inserted stigma
3. Narrow exserted stigma
4. Narrow inserted stigma.

Q. What do you mean by hydrophily?

Q. Pollination in Vallisneria is

1. Hypohydrophily
2. Epihydrophily
3. Subhydrophily
4. Both B and C

Q. Which of the following features is/ are common to both wind and water pollinated flowers?

1. III and IV
2. II and III
3. I and II
4. II
5. I