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प्रश्न
What is pollination?
What is meant by pollination?
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उत्तर
Pollination is the transfer of pollen grains from the anther (the male part) of a flower to the stigma (the female part) of the same flower or another flower of the same species.
APPEARS IN
संबंधित प्रश्न
How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation.
(i) Name the part marked 'A' in the diagram.
(ii) How dose 'A' reachese part 'B'?
(iii) State the importance of the part 'C'.
(iv) What happens to the part marked 'D' after fertilisation is over?
A student has to perform the experiment "To identify the different parts of an embryo of a dicot seed." Select from the following an appropriate group of seeds:
(a) Pea, gram, wheat
(b) Red kidney bean, maize, gram
(c) Maize, wheat, red kidney bean
(d) Red kidney bean, pea, gram
Mention the changes a flower undergoes after fertilisation.
How is the process of pollination different from fertilization?
Mature ovary forms the ______.
Where are the pollen grains produced?
Where is the female gamete formed in flowering plants?
Fill in the following blank with suitable word :
The ovary of a flower becomes ....... after fertilisation.
Fill in the following blank with suitable word :
The.......... at the base of the carpel contains egg cells.
Name the part of a seed which grows into root.
Which of the following is the correct sequence of events of sexual reproduction in a flower?
(a) pollination, fertilisation, seed, embryo
(b) seed, embryo, fertilisation, pollination
(c) pollination, fertilisation, embryo, seed
(d) embryo, seed, pollination, fertilisation
In the figure given alongside, the parts marked A, B and C are sequentially:
| When an insect sits on the flower of a plant then somene 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. |
- 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?
- What is the name of tube B?
- What is C which moves down through the tube B?
- Name D and E.
- What is F?
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:
The male gamete is present inside the which germinates.
- the style
- the stigma
- the anther
- the ovary
Fill in the blanks:
A stamen consists of ______ and ________.
Write the names of male and female reproductive parts of a flower.
Describe an activity to demonstrate phototropism.
Sketch the labelled diagram.
Flower with its sexual reproductive organs.
Prepare a slogan for campaign against female foeticide.
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
What is cleistogamy? Write one advantage and one disadvantage of it, to the plant.
What is meant by pollination?
Answer the following question.
List two agents of pollination?
__________ is present in unisexual flower.
Find an odd one out.
Bisexual : Hibiscus : : Unisexual : ___________
Pollen tube reaches the embryo sac via style.
Pollen grains from anther are transferred to the stigma.
Explain the sexual reproduction process in plants with a diagram.
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?
Which of the following is the outermost protective layer of anther?
How many middle layers are generally present in the wall of the anther lobes?
Identify the female gametophyte in angiosperms.
Pineapple fruit develops from ______.
The seed that contains the future plant is called the ______
Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
State the number of sets of chromosomes present in a zygote.
Double fertilization is essential for formation of ______.
Double fertilization means ______.
What is the structural unit of sexual reproduction in plant?
What are the agents for pollination?
The figure below shows the concept of double fertilization. Complete the flow chart showing the progress at each step:
State the post-fertilisation changes that lead to fruit formation in plants.
- Assertion: Primary endosperm nucleus is diploid.
- Reason: It is the product of double fertilisation.
