Criteria for Autogamy to Take Place

Q.

Self-pollination can occur only in bisexual flowers.

1. True

2. False

Q.

Is complete autogamy rare?

Q.

Will an open flower always exhibit cross pollination?

Q. Advantage of cleistogamy is

1. Higher genetic variability.
2. Vivipary.
3. More vigorous offspring.
4. No dependence on pollinators.

Q. Both chasmogamous and cleistogamous flowers are present in

1. Helianthus
2. Commelina
3. Rosa
4. Gossypium

Q. Choose the correct options stating advantages of self-pollination.

1. No need to produce large quantity of pollen grains
2. Results in healthier offsprings
3. No requirement of nectar or scent production
4. Variations are introduced

Q. A mechanism to prevent cross pollination is

1. Protogyny
2. Cleistogamy
3. Protandry
4. Heterostyly

Q. Flowering plants have developed certain outbreeding devices to discourage self-pollination and encourage cross-pollination. One of these is not an example of such outbreeding device.

1. Dicliny
2. Dichogamy
3. Herkogamy
4. Cleistogamy

Q.

Which of the following statements is NOT correct?

1. Cleistogamous flowers are always self-pollinated.

2. Chasmogamous flowers are always cross-pollinated.

3. Chasmogamous flowers are always self pollinated.

4. All of the above.

Q. Match the columns and choose the correct combination.

	I		II
(a)	Cleistogamy	(m)	Insect pollination
(b)	Geitonogamy	(n)	Bud pollination
(c)	Entomophily	(o)	Pollination between flower of the same plant
(d)	Xenogamy	(p)	Wind pollination
		(q)	Cross pollination

1. a-q, b-p, c-o, d-n
2. a-o, b-m, c-q, d-n
3. a-m, b-q, c-n, d-o
4. a-n, b-o, c-m, d-q

Q. Identify the correct pair of statements.
(i) White kernel of Coconut is a free nuclear endosperm
(ii) In dioecious plants, autogamy is prevented but geitonogamy occurs
(iii) Cleistogamous flowers are always self pollinated
(iv) Castor is an endospermic seed.

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

Q. Cleistogamous flowers are found in

1. Arachis hypogaea
2. Solanum tuberosum
3. Cucumis melo
4. Allium cepa

Q.

Which of these is a type of autogamy?

1. Cleistogamy

2. Chasmogamy

3. Geitonogamy

4. Allogamy

Q. Cleistogamous flower is found in

1. Tobacco
2. Viola
3. Mirabilis
4. None of the above

Q.

Differentiate self pollination and cross pollination.

Q.

For autogamy, it is essential that the anther and stigma of the flower mature at the same time.

True or False

1. True

2. False

Q. Advantage of cleistogamy is :

1. No dependence on pollinators
2. Higher genetic variability
3. Vivipary
4. More vigorous offspring

Q. Bisexual flower which never opens is

1. Homogamous
2. Heterogamous
3. Dichogamous
4. Cleistogamous

Q. In Catharanthus ($=$ Vinca) anthers occur near the mouth of corolla tube. Self pollination is performed by.

1. Growth of style
2. Bending of filaments
3. Shedding of pollen and falling on the low lying stigma
4. Entry of insect

Q. Pollination occurring in closed flowers is

1. Bud pollination
2. Cleistogamy
3. Chasmogamy
4. Homogamy

Q. Above ground cleistogamous flowers are formed late in the season in

1. Balsam
2. Viola
3. Oxalis
4. All the above

Q. Pollination which occurs in closed condition of flowers is called

1. Allogamy
2. Cleistogamy
3. Protandry
4. Protogyny

Q. Assured seed set is possible even in absence of pollinators when flower is

1. Xenogamous
2. Chasmogamous
3. Geitonogamous
4. Cleistogamous.

Q. Even in absence of pollinating agents seed-setting is assured in.

1. Commelina
2. Salvia
3. Fig
4. Zostera

Q.

Advantage of cleistogamy is:

1. Higher genetic variability

2. More vigorous offspring

3. Vivipary

4. No dependence on pollinators

Q.

1. No pollination agent is required
2. It allows xenogamy
3. It assures heterozygosity
4. It favours insect pollination

Q. Cleistogamous flowers are

1. Female flowers which never open
2. Male female which never open
3. Bisexual flowers which never open
4. Open bisexual flowers which perform self pollination in bud condition

Q. An advantage of cleistogamy is

1. It leads to greater genetic diversity.
2. Each visit of pollinator brings hundreds of pollen grains.
3. Seed set is not dependent upon pollinators.
4. Seed dispersal is more efficient and wide spread.