How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation. - Science


How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation.



Fertilization in plants: In plants, pollination is followed by fertilization. Once the pollen grains are deposited on the stigma, they form tubes called pollen tubes. The pollen tubes grow through the ovules and reach the ovary where ovules are located. The pollen tube normally enters the ovule through a small opening called micropyle. Inside the ovule, the pollen tube releases two male gametes into the embryo sac.

The embryo sac of the ovule contains the egg. One male gamete fuses with the egg. This fusion of male and female gamete is called syngamy and its product is called zygote. The other male gamete fuse with two polar bodies and this process is called triple fusion, where three nuclei are involved in the fusion process, one male gamete and two polar nuclei. Thus, inside each embryo sac, two fusions, syngamy and triple fusion, takes place. This mechanism of two fusions occurring in an embryo sac is called double-fertilization.

After fertilization, ovules develop into the seeds and ovary develops into the fruit.

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2013-2014 (March) All India Set 3

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Match the following:

Column A Column B
(i) Stigma (a) Neuron
(ii) Pepsin (b) Carpel
(iii) Dendrites (c) Protein
(d) Stamen


Answer the following question.

What is pollination? Explain the different types of pollination.

Answer the following question.
State significance of pollination.

"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.

The anther contains ______.

Fill in the blanks:

A flower may have either male or female reproductive parts. Such a flower is called _________.

Fill in the blank:

The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _________.

Fill in the blanks:

The fusion of male and female gametes is termed as __________

Explain what you understand by sexual reproduction.

State the main difference between asexual and sexual reproduction.

Sketch the reproductive parts of a flower.

Tick (√ ) the correct answer:

The reproductive part of a plant is the

Tick (√ ) the correct answer:

The process of fusion of the male and female gametes is called

Tick (√ ) the correct answer:

Mature ovary forms the

State the name of the functional unit concerned with sexual reproduction.

Name the part made up of the stigma, style and ovary.

Name the swollen lower part of the carpel.

Where are the pollen grains produced?

Fill in the following blank with suitable word :

The.......... at the base of the carpel contains egg cells.

How is the process of pollination different from fertilization?

The part of a seed which grows and develops into root on germination is :
(a) cotyledon
(b) plumule
(c) follicle
(d) radicle

Fill in the blank by selecting suitable word:

A flower that bears both the male and the female parts is known as __________ flower.

Fill in the blank by selecting suitable word:

A flower bearing only male or female parts is known as __________ flower.

Multiple choice question. Tick (✓) the correct choice:

Unisexual flowers are found in

  1. mulberry
  2. mustard
  3. pea
  4. sunflower

Fill in the blanks:

A carpel consists of ________ , ________ and ________.

Fill in the blanks:

A stamen consists of ______ and ________.

State whether the following statement is true (T) or false (F):

Flowers which possess stamens and carpel are called unisexual.

Find the odd-one out, giving reason:

Anther, pollen grain, ovule male gamete

Mention the function of Flower.

Mention the function of Anther.

What are the male and female gametes in a flowering plant?

In the figure, the parts marked A, B and C are sequentially:

(A) Plumule, Radicle and Cotyledon

(B) Radicle, Plumule and Cotyledon

(C) Plumule, Cotyledon and Radicle

(D) Radicle, Cotyledon and Plumule

“Cell division is a type of reproduction in unicellular organism.” Justify.



Which of the following is not an unisexual flower?
a) Coconut
b) Papaya
c) Gulmohor
d) Maize

Identify the odd. Stigma, Style, Pollen, Ovary.

Sketch the labeled diagram: 

Flower with its sexual reproductive organs 

Fill in the blanks and rewrite the completed statements:

Lymph flows in _______________ direction. 

Draw a diagram of the longitudinal section of a flower and label the following parts.

Differentiate between self-pollination and cross-pollination.

What is cleistogamy? Write one advantage and one disadvantage of it, to the plant.

What is meant by pollination?

Pollen grains are formed by _________ division in locules of anthers.

__________ is present in unisexual flower.

Find an odd one out.

Find an odd one out.

Bisexual : Hibiscus : : Unisexual : ___________

Pollen tube reaches the embryo sac via style.



Write the functions of sepals

Give scientific reason.

Fertilization in plants is called double fertilization.

Distinguish between self-pollination and cross-pollination.

Draw a neat and labelled diagram.

Double fertilization in angiosperms

Explain the sexual reproduction process in plants with a diagram.

The male reproductive part of a flower is ______.

Match the following

1. Petal Opuntia
2. Fern Chrysanthemum
3. Phylloclade Attracts insect
4. Hooks Spore
5. Sucker Bignonia

The essential parts of a flower are ______.

Identify the parts A, B, C, and D?

Write the events involved in the sexual reproduction of a flowering plant.

Discuss the first event and write the types.

Write the events involved in the sexual reproduction of a flowering plant.

a. Discuss the first event and write the types.

b. Mention the advantages and the disadvantages of that event.

In which part of the flower germination of pollen grains takes place?

Where does the endothecium layer of anther lobes is present?

The anther wall consists of four wall layers where ______

In which of the following manner the arrangement of megaspores in a tetrad is observed in angiosperms?

The ovule of an angiosperm is technically equivalent to ______

Antipodal cells are present towards the ______ in an anatropous ovule.

Generally, in a pollen tube, which of the following moves to the tip of the tube?

How many middle layers are generally present in the wall of the anther lobes?

Which type of development is observed in male gametophytes of plants?

The 3-celled egg apparatus at the micropylar end comprises of ______

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its roots tip cells?

Gloriosa superba exhibits ______.

Sperm and egg nuclei fuse due to ______.

Flowers showing ornithophily show few characteristic like ______.

In a flowering plant, archesporium gives rise to ______.

Pineapple fruit develops from ______.

What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in its synergids?

Conidia are formed endogenously while zoospores are formed endogenously.

Complete the table

Carly x  ______  ______
 ______ petal attract insects
Androecium  ______ Male reproductive part
 ______ ______ Female reproductive part.

Draw the diagram of a flower and label the four whorls. Write the names of gamete producing organs in the flower.

The ovaries of different flowers may contain

Double fertilization is exhibited by ______

Double fertilization is essential for formation of ______.

Double fertilization means ______.

Sketch and label the essential and accessory whorls of flower.

What are the agents for pollination?

What is the function of calyx?

Triple fusion involves ______.

Type of sexual reproduction is ______.

The pollen tube usually enters the embryo sac ______.

Given below is a diagram of a germinating seed. Label the parts that:

  1. gives rise to future shoot.
  2. gives rise to future root system.
  3. stores food. 

  • Assertion: Primary endosperm nucleus is diploid.
  • Reason: It is the product of double fertilisation.


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