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प्रश्न
Mention pollination types.
Explain the different types of pollination.
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उत्तर
- Self-pollination: It is the transfer of pollen grains from the anther to the stigma of the same flower or another flower on the same plant.
- Cross-pollination: It is the transfer of pollen grains from the anther to the stigma of the flower present on two different plants.
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संबंधित प्रश्न
"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.
You are asked by your teacher to study the different parts of an embryo of a gram seed. Given below are the steps to be followed for the experiment:
I. Soak the gram seeds in plain water and keep them overnight.
II. Cut open a soaked seed and observe its different parts.
III. Take some dry gram seeds in a petri dish.
IV. Drain the excess water.
V. Cover the soaked seeds with a wet cotton cloth and leave them for a day.
The correct sequence of these steps is :
(A) III, I, V, IV, II
(B) III, I, II, IV, V
(C) III, IV, V, I, II
(D) III, I, IV, V, II
State the name of the functional unit concerned with sexual reproduction.
Name the male part of the flower.
What is the function of a flower?
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 name of the structure in the flower in which the male gamete is formed is...........
Fill in the following blank with suitable word :
The.......... at the base of the carpel contains egg cells.
What is made in ovary of a flower?
Name the part of a seed which grows into root.
What is meant by ‘unisexual flowers’?
What changes take place in the flower after fertilisation which lead to the formation of seeds and fruit?
Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel.
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
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.
One of the following occurs in the reproductive system of flowering plants as well as that of humans. This is :
(a) vas deferens
(b) anther
(c) ovary
(d) style
In the figure given alongside, the parts marked A, B and C are sequentially:
The part of a seed which grows and develops into root on germination is :
(a) cotyledon
(b) plumule
(c) follicle
(d) radicle
In what ways is fertilisation in a plant similar to fertilisation in a human?
Put a tick mark (✓) against the correct alternative in the following statement
Reproductive whorls of a flower are:
Multiple choice question. Tick (✓) the correct choice:
Unisexual flowers are found in
- mulberry
- mustard
- pea
- sunflower
Fill in the blank:
Seeds are formed from________.
State whether the following statement is true (T) or false (F):
Stamens make egg cells.
What are the male and female gametes in a flowering plant?
Draw a labelled diagram of a bisexual flower.
Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.
What is phototropism?
Differentiate between self-pollination and cross-pollination.
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?
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?
Pollen grains are produced by ______
Variations occur as a result of ______
Consider the following three flowers namely X, Y and Z. Which flower(s) would develop into a fruit?
| Flower X | Flower Y | Flower Z |
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