Why does self-pollination not lead to seed formation in self-incompatible species? - Biology

Answer in Brief

Why does self-pollination not lead to seed formation in self-incompatible species?



The plants which exhibit the phenomenon of self-pollination have the ability to prevent germination of pollen grains and thus, prevent the growth of the pollen tube on the stigma of the flower. This prevents the fusion of the gametes along with the development of the embryo. As a result, no seed formation takes place.

Concept: Pollination
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Chapter 2: Sexual Reproduction in Flowering Plants - Exercises [Page 41]


NCERT Biology Class 12
Chapter 2 Sexual Reproduction in Flowering Plants
Exercises | Q 9.2 | Page 41

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Lever mechanism of pollination is observed in

  1. Salvia
  2. Jasmine
  3. Bougainvillea
  4. Butea

With the help of a suitable example, explain protandry.

List the different types of pollination depending upon the source of pollen gain.

Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.

What is self-incompatibility?

What is bagging technique? How is it useful in a plant breeding programme?

Write two ways in which pollination may occur in plants.

Name two characteristics of flowers in which pollination occur by wind.

What is meant by pollination?

Fill in the blank:

Male sex cells in plants are called _________.

Fill in the blanks:

The two kinds of pollination are __________ and __________.

Find the odd-one out, giving reason:

Ovary, style, pollen grain, stigma

Differentiate between the following:

Self pollination and cross pollination.

Define the term Pollinating.

Can a unisexual flower be self pollinated?

Complete the following chart and rewrite.

Sr.No. Agencies type of pollination
1 Water ....................
2 ........................... Entomophily
3 Bat ....................
4 ....................... Ornithophily



Explain outbreeding devices in angiospermic plants.

Exine and intine are the parts of

Fill in the blanks with suitable words.

Different timings for the maturation of gynoecium and androecium is called ________.

Name of the part of the ovary which gives rise to:

Fruit ______

Name of the parts of the ovary which give rise to: 

Fruit wall ______

When maturation time of reproductive parts in a flower is different.

Give one word/term for the following:

Pollination of flowers by insects.

Give one word/term for the following:

Pollination of flowers by birds.

Mention any two contrivances in flowers which favour cross-pollination.

Choose the correct option of the following question:

Type of Interaction where an individual sacrifices its own welfare (life) for the benefit of another animal of its own species is:

State four features of flowers pollinated by insects.

Give four adaptations shown by flowers pollinated by wind.

Differentiate between geitonogamy and xenogamy.

Put a tick mark (✓) against the correct alternative in the following statements

Pollen is produced in the

Put a tick mark (✓) against the correct alternative in the following statements

Vegetative propagation is not observed in:

Name the two types of pollination.

What is a flower? Draw a typical flower and label its different parts.

Describe pollination. How many types of pollinations are found?

Write different modes of pollination in detail with suitable examples.

Very short answer type question:

What is hydrophily?

Mention various adaptations for wind pollination.

Give an account of any two biotic agents for pollination along with their adaptations.

For which of the following attractants and rewards are required?

Wind pollination is common in ______.

Both chasmogamous and cleistogamous flowers are present in ______.

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

A dioecious flowering plant prevents both ______.

Pollination occurs in ______.

Chief pollinators of agricultural crops are ______.

Anemophily type of pollination is found in ______.

Which one of these statements is incorrect?

The following statements seem to describe the water-pollinated submerged plants. 

Pollination refers to the

Which type of pollination does Figure 12.1 indicate?

Which one of the following may require pollinators, but is genetically similar to autogamy?

Advantage of cleistogamy is:

In which one of the following pollination is autogamous?

Correct definition of pollination is ______

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is ______

What is self-incompatibility?

Describe any three adaptations in anemophilous flowers.

Consider the following statements depicting adaptation of flowers to carryout successful pollination.

  1. Stigma is long, sticky and unwettable.
  2. Sepals, petals or perianth (if present) have waxy coating.
  3. Stamens with long filament and versatile anthers.
  4. Tubular corolla is seen.
  5. Flowers are noctumal.

Which of the above statements clearly depict hydrophily?

Match the Column I with Column II.

Column I Column II
A. Pea (i) Xenogamy
B. Jawar (ii) Epihydrophily
C. Maize (iii) Anemophily
D. Vallis (iv) Bisexual
E. Cannabis (v) Geitonogamy

Pollination in water lilies is carried out by ______.

Which of the following floral adapation are adapted by hydrophilous flowers?

Mention any one example of the hydrophilous flower.

What is hypohydrophily?

Name the following:

Aquatic plants which are anemophilous.

Briefly discuss any two methods by which plants avoid self-pollination.


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