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प्रश्न
What are the agents for pollination?
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उत्तर
Pollination occurs with the help of abiotic agents (wind, water) and biotic agents (insects and other animals).
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संबंधित प्रश्न
In the following diagram showing the structure of embryo of a dicot seed, what are the parts marked I, II and III sequentially?
Where are the pollen grains produced?
What is the function of a flower?
Fill in the following blank with suitable word :
Ovules contain ......... gametes of a plant.
Fill in the following blank with suitable word :
The ovule becomes a .......... after fertilisation.
Fill in the following blank with suitable word :
The name of the structure in the flower in which the male gamete is formed is...........
Draw a neat sketch of the stamen of a flower. Mark in it filament and anther.
What is made in anther of a flower?
What is meant by ‘unisexual flowers’?
Which of the following statements are true for flowers?
(i) Flowers are always bisexual.
(ii) They contain sexual reproductive organs.
(iii) They are produced in all groups of plants.
(iv) after fertilization they give rise to fruits.
Which among the following statements are true for unisexual flowers?
(i) They possess both stamen and pistil
(ii) They possess either stamen or pistil
(iii) They exhibit cross pollination
(iv) Unisexual flower possessing only stamens cannot produce fruits
(a) (i) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (i), (iii) and (iv)
In a bisexual flower, inspite of the young stamens being removed artificially, the flower produces fruit. Explain.
In what ways is fertilisation in a plant different from fertilisation in a human?
What part is played by stamens and carpels in reproduction?
You have to perform the experiment, "To identify the different parts of an embryo of a gram seed." Describe the procedure that you would follow.
Explain the process of fertilisation in flowers.
“Cell division is a type of reproduction in unicellular organism.” Justify.
Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:
Pollen grain, male gamete, female gamete, ovary.
__________ is present in unisexual flower.
Pollen tube reaches the embryo sac via style.
What does germination mean?
Give scientific reason.
Flower is a structural unit of sexual reproduction in plants.
Give scientific reason.
Fertilization in plants is called double fertilization.
Distinguish between self-pollination and cross-pollination.
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.
Identify the female gametophyte in angiosperms.
Sperm and egg nuclei fuse due to ______.
The flower of the Hibiscus plant is ______
Variations occur as a result of ______
Which among the following statements are true for unisexual flowers?
- They possess both stamen and pistil
- They possess either stamen or pistil
- They exhibit cross pollination
- Unisexual flowers possessing only stamens cannot produce fruits
Which among the following statements are true for sexual reproduction in flowering plants?
- It requires two types of gametes
- Fertilisation is a compulsory event
- It always results in formation of zygote
- Offspring formed are clones
Where is the zygote located in the flower after fertilization?
Double fertilization means ______.
Give any two examples of agents of pollination.
The figure below shows the concept of double fertilization. Complete the flow chart showing the progress at each step:
In male reproductive whorl of a flower the archesporial cells are formed by ______.
