Name the Parts Labelled as A, B, C and D in the Diagram Given Below - Science


Name the parts labelled as A, B, C and D in the diagram given below:



In the given figure,

A represents the pollen grain

B represents the pollen tube

C represents the ovary

D represents the female germ cell

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2013-2014 (March) All India Set 1

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In the following diagram showing the structure of embryo of a dicot seed, what are the parts marked I, II and III sequentially?

Answer the following question.
State significance of pollination.

State the function of flowers in the flowering plants.

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.

How does the process of fertilisation take place in flowers?

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

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

Name the swollen lower part of the carpel.

Name the male part of the flower.

What is the name of female part of a flower?

Fill in the following blank with suitable word :

The term used to refer to the transfer of pollen from the stamen of one flower to the carpel of another flower of the same species is...........

 Draw a neat sketch of the stamen of a flower. Mark in it filament and anther.

Name the part of a seed which contains stored food.

When an insect sits on the flower of a plant then some particles A present in the top of little stalks in the flower attach to its body hair. When this insect now sits on the flower of another similar plant, then particles A attached to the hair of insect are put on the top of a flask-shaped organ at the centre of flower. The particle A grows a long tube b from the top of flask-shaped organ through which C moves down and reaches the bottom part of flask-shaped organ. Here C fuses with the nucleus of d contained in structure E. the fusion of C and D forms a new cell f which grows and develops into a seed of the plant.
(a) What are particles A? What is the process of transferring A from one flower to another flower of similar plant by the insect known as?
(b) What is the name of tube B?
(c) What is C which moves down through the tube B?
(d) Name D and E.
(e) What is F?

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

Pollen is produced in the:

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

Reproductive whorls of a flower are:

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 stamen consists of ______ and ________.

Fill in the blank:

Seeds are formed from________.

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

Flowers which possess stamens and carpel are called unisexual.

Mention the function of Anther.

Mention the function of Stigma.

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

Explain sexual reproduction in plants. 

Prepare a slogan for campaign against female foeticide.

What is pollination? Mention its types.

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.

Find an odd one out.

Bisexual : Hibiscus : : Unisexual : ___________

Accessory whorls : Calyx and corolla : : essential whorls : ______________

Pollen tube reaches the embryo sac via style.

Pollen grains from anther are transferred to the stigma.



What does germination mean?

Write the functions of sepals

Give scientific reason.

Flower is a structural unit of sexual reproduction in plants.

Give scientific reason.

Fertilization in plants is called double fertilization.

Explain the sexual reproduction process in plants with a diagram.

Observe the figure below. Write functions of the labelled parts.

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?

The ovule of an angiosperm is technically equivalent to ______

Which of the following are the chemical components of the wall of pollen tube?

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

Which of the following is the outermost protective layer of anther?

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 ______

Identify the female gametophyte in angiosperms.

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.

In human beings, fertilization occurs in the ______

Complete the table

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

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.

Give any two examples of agents of pollination.

In a plant flower the female whorl is ______.

Triple fusion involves ______.

What is puberty?

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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