Autogamy

Q.

What are the advantages of self-pollination?

Q.

Which of the following is not a type of pollination ?

1. Geitonogamy

2. Autogamy

3. Allogamy

4. Monogamy

Q.

Give some examples of plants that use cross-pollination

Q.

Is geitonogamy cross-pollination?

Q.

Unisexual flowering plants can undergo self-pollination.

1. True

2. False

Q.

Insect pollinated flowers usually possess _____________.

Q. What is polyploidy?

Q.

Fill in the blanks with suitable words.
(a) Transference of pollen grains from anthers to stigma of the same flower is called ___
(b) Different timings for maturation of gynoecium and androecium, is called ___
(c) ___ is a water-pollinated flower.

Q.

Give two examples of each of the following:

Pollination by water.

Q.

Which of the following conditions will be true if male and female flowers are present in different plants?

1. Only xenogamy is prevented

2. Only autogamy is prevented

3. Both geitonogamy and xenogamy is prevented

4. Both autogamy and geitonogamy is prevented

Q.

In _________, the stigma and anther grow at a different height which does not favour self-pollination.

1. prim rose

2. orchids

3. sweet peas

4. tomato

Q.

Are Calotropis gynandrous?

Q.

Autogamy is the process of pollination between

1. The anther and stigma of the same flower

2. The anther and stigma of two different flowers of the same plant.

3. All of the above.

4. The anther and stigma of flowers of two different plants of the same species.

Q.

What will happen if there is a distance between stigma and anther in the same flower?

1. Reduces the possibility of self-pollination

2. Increases the possibility of cross-pollination

3. Increases the possibility of self-pollination

4. Reduces the possibility of cross-pollination

Q. The disadvantage of self-pollination is ..............

1. There is no wastage of pollen grains.
2. The seeds are less in number.
3. Self-pollination is sure in bisexual flowers.
4. Flowers need not depend on agents of pollination.

Q. Self pollination means:

1. Germination of pollens within the anther.
2. Transference of pollens from anthers to the stigma within the same flower.
3. Transference of pollens from one flower to another on the same plant.
4. Presence of male and female sex organs in the same flower.

Q. Both autogamy and geitonogamy cannot occur in

1. Papaya
2. Cucumber
3. Castor
4. Maize

Q.

What does cross pollination mean?

Q. Discuss about self-pollination and cross-pollination.

Q. Give advantage of self pollination

Q.

Differentiate between self pollination and cross pollination.

Q. Name the type of flower which favours self-pollination.

Q. Transference of pollen grains from anthers to stigma of the same flower is called______

Q. What is self-pollination? Mention its merits and demerits.

Q. State whether true or false.
Autogamy refers to cross-pollination in plants

1. True
2. False

Q.

The pollen of another flower of the same plant fall on the stigma is called as _______.

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1. Autogamy

2. Geitonogamy

3. Allogamy

4. Both A and B

Q. Which one of the following is not a disadvantage of self pollination?

1. No scope for developing improved varieties
2. Progeny becomes weaker
3. Genetic stability can be maintained
4. Less adaptability to climatic variations

Q. In bisexual flowers, maturation of gynoecium before androecium is known as

1. Protogyny
2. Protandry
3. Gynandry
4. Dicliny

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. Lever or turn - pipe mechanism of pollination occurs in.

1. Salvia
2. Antirrhinum
3. Gloriosa
4. Phlox