Pollination

Q.

About division of labour in cells

Q.

Describe the advantages and disadvantages of cross-pollination to the plant.

Q.

What are the contrivances of self-pollination?

Q.

The Mediterranean orchid Ophrys employs to get cross-pollinated by a species of bees

1. Diapause

2. Pseudocopulation

3. Camouflage

4. Sexual deceit

Q.

Which one of the following is one of the characteristics of self-pollinated flowers?
(a) Flowers are large and showy
(b) Flowers remain closed and do not open
(c) Stigma and anthers mature at the same time
(d) Pollen is produced in very large quantities

Q.

Which of the following are the characteristics of self-pollinated plants?

1. Flowers are large and showy

2. Flowers remain closed and do not open

3. Stigma and anthers mature at the same time

4. Pollens are produced in large quantity

Q. Choose the characters of anemophilous or wind-pollinated plants

1. Flowers do not produce scent or nectar.
2. Flowers are large and brightly colored.
3. Very few pollen grains are produced.
4. The stamens are long and protrude out of the flowers to be exposed to the wind

Q.

Which one of the following adaptation does not favour cross-pollination?

1. Cleistogamy

2. Herkogamy

3. Dichogamy

4. None of the above

Q. In maize plant, the male flowers are borne at the___ and female flowers are borne near___of the plant.

Q.

When the sperm fuses with the egg from the ovary it produces

1. spores

2. bud

3. flower

4. zygote

Q.

Cleistogamous flowers are

1. Self pollinated

2. Bird pollinated

3. Insect pollinated

4. Wind pollinated

Q.

Why are artificially pollinated flowers covered with polythene bags?

1. To prevent cross pollination

2. To prevent transpiration

3. To avoid pests

4. To maintain optimum temperature for growth

Q.

Which plant is dioecious in nature?

Q. Bryophytes need water for their reproduction and hence cannot live without water so they are called:

1. Hydro bryophytes
2. Amphibians of plants
3. Amphibians
4. Water moulds

Q.

Match the following:
$\begin{array}{cccc}\text{A.}& \text{Zoophily}& 1.& \text{Pollination by birds}\\ \text{B.}& \text{Ornithophily}& 2.& \text{Pollination by insects}\\ \text{C.}& \text{Entomophily}& 3.& \text{Pollination by bats}\\ \text{D.}& \text{Chiropterophily}& 4.& \text{Pollination by animals}\end{array}$

1. A – 3, B – 2, C – 1, D – 4

2. A – 1, B – 2, C – 3, D – 4

3. A – 4, B – 1, C – 2, D – 3

4. A – 4, B – 2, C – 1, D – 3

Q. Which among the following conditions promote self-pollination?

1. Unisexuality
2. Dichogamy
3. Heterostyly
4. Homogamy

Q.

Which of the following parts are removed during emasculation?

1. Anthers after dehiscence
2. Pollen grains
3. Anthers before dehiscence
4. Stigma

Q.

The pollen of the same flower fall on its stigma by itself is called as _______.

1. Autogamy

2. Geitonogamy

3. Allogamy

4. Both A and B

Q. How hydrophilly takes place in vallisneria plant?

Q.

Question 28
In a bisexual flower, the young stamens are removed artificially but the flower produces fruit. Provide a suitable explanation for the given situation.

Q.

The flowers which are pollinated by nocturnal animals or birds are usually ___ in color.

1. white

Q. Vallisneria undergoes only pollination.

1. self
2. cross
3. artificial

Q.

What do you understand by division of labour

Q.

Pollen grains can be carried through

1. Air

2. Water

3. Insects

4. Animals

Q.

Cross pollination is uneconomical for the plants.

1. True

2. False

Q.

Give a one word for following

Transfer of pollen grains from anther to the stigma.

Q. During pollination, pollen grains get carried to of the carpel.

1. stamen
2. stigma
3. ovary
4. filament

Q.

Self-pollination is

1. Transfer of pollen grains from anthers to the stigma of the same flower

2. Transfer of pollen grains from anthers to the stigma of a flower borne on the same plant

3. Transfer of pollen grains from anthers to the stigma of another flower

4. Transfer of pollen grains from anthers to the stigma of a flower of different species

Q.

Cross pollination results in healthier offsprings.

1. True

2. False

Q.

Artificial pollination is carried out for

1. better yield and quality

2. disease resistant seeds

3. sudden growth of seeds

4. better varieties of seeds