Xenogamy

Q.

Define a flower.

Q. Herkogamy is the condition in which anther and stigma are placed in positions to ensure pollination.

1. different
2. cross
3. same
4. self

Q.

Write any one advantage and one disadvantage of self pollination and cross pollination.

Q.

Give examples of chasmogamous flowers?

Q.

Autogamy: Homogamy:: Xenogamy:

1. Dichogamy

Q.

Entomophily is a type of cross-pollination in which the pollens from the anther of one plant are transferred to the stigma of another flower with the help of insects.

Which of the following characteristics is not shown by insect pollinated flowers?

1. They produce nectar

2. They are brightly coloured

3. They have light and feathery pollens

4. They produce a pleasant to foul odour

Q.

Why is geitonogamy called genetically autogamy?

Q.

Which type of pollination is possible in a plant with bisexual flowers?

1. autogamy, geitonogamy and xenogamy

2. geitonogamy and xenogamy

3. xenogamy and cleistogamy

4. autogamy

Q.

Differentiate between the following:

Self fertilization and cross fertilization.

Q.

Animal vectors are required for pollination in-

1. Mulberry

2. Vallisneria

3. Maize

4. Cucumber

Q.

Which of the following terms describes pollination by the agency of ants?

1. Cheiropterophily

2. Entomophily

3. Ornithophily

4. Myrmecophily

Q.

Cross-pollination is also known as allogamy.

1. False

2. True

Q.

The cross-pollinating plants depend on external agents like bees, butterflies, wind etc for the transfer of pollen grains. The agents are called as________

1. pollinating agents

2. transferring agents

3. meeting agents

4. exchange agents

Q.

How is papaya able to prevent both autogamy and geitonogamy?

Q.

Explain.....

What part does stigma play in the process of fertilization

Q.

In cross pollination, there is a lot of wastage of ___.

Q. What is cross-pollination? Write advantages and disadvantages of cross pollination.

Q.

The phenomenon of substitution of the usual sexual process by asexual methods is known as apomixis. True or False?

1. True

2. False

Q.

Cross-pollination is the transfer of pollen from the anthers of a flower of one plant to the _______ of a flower of another plant.

1. stigma

2. style

3. filament

4. ovule

Q.

In order to attract pollinating agents, flowers of cross-pollinating plants adopt various devices like_________

1. Large showy flowers

2. Bright colours

3. Nectar

4. Less number of pollen grains

Q. What is emasculation?

1. Pollination between flowers of different plants
2. Pollination between flowers of same plant
3. Removal of the stamens of a plant to prevent self pollination
4. Artificial pollination

Q.

Emasculation is a method in which anthers are removed from the flowers to prevent self-pollination.

1. False

2. True

Q.

Disadvantages of cross pollination.

Q. What is cross-pollination? Describe its advantages and disadvantages.

Q.

Cross-pollination is more preferable than self-pollination.

1. False

2. True

Q. What is cross-pollination? Write only the names of different types of cross-pollination. Describe the germination of pollen grain with the help of diagrams.

Q. Mention two advantages of the following.
(i) Hydroponics
(ii) Turgidity to plants
(iii) Cross-pollination

Q. Which of the following plants shows the self-sterility?

1. Tobacco
2. Crucifers
3. Potato
4. All of the above

Q. Cross pollination is important for producing

1. New varieties of plants
2. Plants with better growth
3. More viable seeds
4. All of the above

Q. Heterostyly as a contrivance for cross-pollination is found in.

1. Primula vulgaris
2. Oenothera
3. Pennisetum
4. Impatiens