Pollination

Q.

Attractants and rewards are required for-

1. hydrophily

2. entomophily

3. anemophily

4. cleistogamy

Q.

What is the significance of pollination?

Q.

The transfer of pollen grains from the anther to stigma of a flower is called pollination.

1. True

2. False

Q.

Write the various methods of cross pollination.

Q.

Define cross pollination.

Q.

What is pollination?

Q.

Explain sexual reproduction in plants? [5 MARKS]

Q. Given are some events occurring in plant fertilisation.
A. Pollen grains land on stigma.
B. Tip of pollen tube breaks and releases the male gametes.
C. Pollen tube is formed.
D. Male gamete fuses with the egg.
Choose the option which represents the correct sequence of events?

1. A $\to$ B $\to$ C $\to$ D
2. A $\to$ C $\to$ B $\to$ D
3. A $\to$ D $\to$ B $\to$ C
4. A $\to$ D $\to$ C $\to$ B

Q.

Assertion (A): Plants pollinated by abiotic agents produce enormous amounts of pollen as 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. Both A and R are true and R is the correct explanation to A.

2. A is true and R is false.

3. Both A and R are false.

4. A is false and R is true.

Q.

Pollen tube enters the ovule through micropyle.

1. True

2. False

Q. Write the correct sequence of events of sexual reproduction in a flower? [2 MARKS]

Q.

What are the steps involved in the Sexual reproduction of a plant?

Q.

What are autogamy and allogamy?

Q. Transfer of pollen grains from anther of one flower to the stigma of another flower is called .

Q.

How does grass pollinate?

Q.

What is autogamy?

Q.

Pollination between flowers borne on two different plants of the same species refers to __________.

Q. Geitonogamy involves -

1. fertilisation of a flower by pollen from the same flower
2. fertilisation of a flower by the pollen from another flower of the same plant
3. fertilsation of a flower by the pollen from a flower of another plant belonging to a distant population
4. fertilisation of a flower by the pollen from a flower of another plant in the same population

Q.

In flowers, which one of the following conditions will increase chances of self-pollination?

1. Stamens are just above the stigma of a pistil in a flower.

2. In all flowers of the plant only pistil is present.

3. In all flowers of the plant only stamens are present.

4. Pistil is longer than stamens in a flower

Q.

(a) Explain the terms ' self-pollination' and 'cross-pollination'?
(b) How do the insects help in cross-pollination?
(c) How is the process of pollination different from fertilization?

Q. Autogamy refers to cross-pollination in plants.

1. False
2. True

Q.

This flower undergoes pollination by insect

1. Marigold

2. Bamboo

3. Dandelion

4. Rice

Q.

(e)State two advantages of grafting method of artificial propagation of plants.

Q.

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

pollination or somthing else?

Q.

What is dioecious and give an example of it?

Q.

Name the following:

Kind of pollination in maize plant.

Q. Which part of the flower attracts insects for pollination?

1. Sepal
2. Petals
3. Stigma
4. Anther

Q.

Explain how pollination is possible between two flowers borne on two different apple trees in a garden. Name any two agents that would be able to pollinate such flowers.

Q.

Which of the following is/are included in asexual method of reproduction?

1. Fission
2. Fragmentation
3. Vegetative propagation
4. Budding

Q.

What are the two types of pollination?