Question 1

Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by:

Accepted Answer

Wind pollinated flowers have generally single ovule in each ovary.

Question 2

Unisexuality of flowers prevents:

Accepted Answer

Correct answer is C

Question 3

Choose the mis-matched option.

Accepted Answer

Correct answer is D

Question 4

One advantage of cleistogamy is:

Accepted Answer

Correct answer is C

Question 5

Even in absence of pollinating agents seed setting is assured in:

Accepted Answer

In cleistogamy bisexual flowers never open therefore the pollengrains may only pollinate the stigma of the same flower e.g., commelina bengalenis (day flower)

Question 6

Continued self pollination result in:

Accepted Answer

Correct answer is B

Question 7

Match the entries in Column I with those of Column II and chonse the correct answer.

Accepted Answer

Correct answer is C

Question 8

Pollination occurs when a pollen grain:

Accepted Answer

Correct answer is B

Question 9

Match the following:

Accepted Answer

Correct answer is C

Question 10

Pollination by wind is called:

Accepted Answer

Correct answer is B

Question 11

Geitonogamy involves:

Accepted Answer

Geitonogamy is the transfer for pollen grains from anthers of one flower to another flower of either the same plant or genetically similar plant or between two clones.

Question 12

Pollination by slug and snails is called:

Accepted Answer

Malacophily is cross pollination brought about by the agency of snails, slugs e.g., Arisaema (cobra plant).

Question 13

Dichogamy which helps in cross pollination is a floral mechanism in which:

Accepted Answer

Dichogamy is the maturation of anther and stigmas of a flower at different times, e.g., sunflower.

Question 14

Correct definition of pollination is:

Accepted Answer

Correct answer is A

Question 15

Which of the following is pollinated by water?

Accepted Answer

Correct answer is D

Question 16

Main condition for a plant to perform cross pollination is:

Accepted Answer

Self sterility, herkogamy and dichogamy are adaptation for cross pollination.

Question 17

Large Stout, nocturnal flowers producing copious nectar and emitting fermenting fruity odour, are the adaptations for:

Accepted Answer

Correct answer is C

Question 18

In plants, in nature, autogamy is avoided since the seeds produced:

Accepted Answer

Correct answer is D

Question 19

Wind pollinated flowers are:

Accepted Answer

Correct answer is C

Question 20

The ovary after ferilization is converted into:

Accepted Answer

After fertilisation, the ovule is converted into seed and ovary into fruit.

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Solutions for Class 12 Biology Important Questions

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