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प्रश्न
Draw a neat and labelled diagram.
Double fertilization in angiosperms
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उत्तर
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संबंधित प्रश्न
Name the parts A, B and C shown in the diagram and write their functions.
(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?
State significance of pollination.
Name the parts labelled as A, B, C and D in the diagram given below:
"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.
Give one example of a unisexual flower.
Mention the changes a flower undergoes after fertilisation.
A flower may have either male or female reproductive parts. Such a flower is called ______.
Mature ovary forms the ______.
Where is the male gamete formed in flowering plants?
Fill in the following blank with suitable word :
Ovules contain ......... gametes of a plant.
Fill in the following blank with suitable word :
The female organ of reproduction in the flower is the...........
Fill in the following blank with suitable word :
The name of the structure in the flower in which the male gamete is formed is...........
What is made in anther of a flower?
Name the part of a seed which contains stored food.
The length of pollen tube depends on the distance between :
(a) pollen grain and upper surface of stigma
(b) pollen grain on upper surface of stigma and ovule
(c) pollen grain in anther and upper surface of stigma
(d) upper surface of stigma and lower part of style
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.
A student is asked to study the different parts of an embryo of pea seeds. Given below are the essential steps for the experiment :
(I) Soak the pea seeds in plain water and keep them overnight.
(II) Cut open the soaked seed and observe its different parts.
(III) Take some pea seeds in a petri dish.
(IV) Drain the excess water. Cover the seeds with a wet cotton cloth and leave them as it is for a day.
The correct sequence of these steps is
(A) III, I, IV, II
(B) III, IV, I, II
(C) III, I, II, IV
(D) III, II, I, IV
Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:
Pollen grain, male gamete, female gamete, ovary.
Describe an activity to demonstrate phototropism.
Which of the following is not an unisexual flower?
a) Coconut
b) Papaya
c) Gulmohor
d) Maize
Explain sexual reproduction in plants.
Pollen tube reaches the embryo sac via style.
Distinguish between self-pollination and cross-pollination.
The anther wall consists of four wall layers where ______
The ovule of an angiosperm is technically equivalent to ______
Which of the following is the outermost protective layer of anther?
Pineapple fruit develops from ______.
The flower of the Hibiscus plant is ______
In human beings, fertilization occurs in the ______
Variations occur as a result of ______
Give any two examples of agents of pollination.
What are the agents for pollination?
Consider the following three flowers namely X, Y and Z. Which flower(s) would develop into a fruit?
| Flower X | Flower Y | Flower Z |
 |
 |
 |
Given below is a diagram of a germinating seed. Label the parts that:
- gives rise to future shoot.
- gives rise to future root system.
- stores food.
State the post-fertilisation changes that lead to fruit formation in plants.
The number of pollen sacs in a dithecous anther is ______.
