Triple fusion in Capsella bursa pastoris is fusion of male gamete with ______. - Biology

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Triple fusion in Capsella bursa pastoris is fusion of male gamete with ______.


  • egg

  • synergid

  • secondary nucleus

  • antipodal



Triple fusion in Capsella bursa pastoris is fusion of male gamete with secondary nucleus.

Concept: Pollination
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Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?

Describe the characteristic features of wind pollinated flowers.

Explain the post-pollination events leading to seed production in angiosperms.

A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds.

Answer the following questions giving reasons :

(a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil?

(b) What would have been the minimum number of ovules present in the ovary?

(c) How many megaspore mother cells were involved?

(d) What is the minimum number of microspore mother cells involved in the above case?

(e) How many male gametes were involved in this case?

What are chasmogamous flowers?

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

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

Add a note on pollination mechanism in Salvia.

Give the floral adaptations for anemophily.

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.

Which one of the following is one of the characteristics of self-pollinated flowers?

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 ______

Give one word/term for the following:

When stigma and anthers do not grow up to the same height, which favors only cross-pollination.

Give one word/term for the following:

Pollination of flowers by birds.

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

Describe the advantages and disadvantages of cross-pollination to the plant.

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.

Answer the following question.
Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.

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 the Advantages and Disadvantages of self-pollination to the Plant.

What are the adaptations which are required in cross-pollinated

The question has four options. Choose the correct answer:
Pollination by insect is known as

At which stage pollen grains are shed from the anther in Angiosperms?

What are the different adaptations shown by bird-pollinated flowers?

Explain water pollination in detail with its types.

Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.

For which of the following attractants and rewards are required?

Wind pollination is common in ______.

From among the situations given below, choose the one that prevents both autogamy and geitonogamy.

A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by ______.

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

A dioecious flowering plant prevents both ______.

Feathery stigma occurs in ______.

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

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 ______

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?

Name the following:

One plant each of Hypohydrophily and epihydrophily.

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


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