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Question
Pollen grains are formed by _________ division in locules of anthers.
Options
meiosis
mitosis
amitosis
binary
Solution
Pollen grains are formed by meiosis division in locules of anthers.
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RELATED QUESTIONS
Name the parts labelled as A, B, C and D in the diagram given below:-
A student identified the various parts of an embryo of a gram seed and listed them as given below :
(I) Testa
(II) Plumule
(III) Radicle
(IV) Cotyledon
(V) Tegmen
Out of these the actual parts of the embryo are :
(A) I, II, III
(B) II, III, IV
(C) III, IV, V
(D) II, IV, V
Explain what you understand by sexual reproduction.
What are the reproductive organs in a flower?
What is the name of female organ of a flower (other than carpel)?
Fill in the following blank with suitable word :
The male organ of reproduction in the flower is the.......... .
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 :
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(b) plumule, radicle and cotyledon
(c) plumule, cotyledon and radicle
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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?
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Put a tick mark (✓) against the correct alternative in the following statement
Pollen is produced in the:
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.
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(b) Mention the role of gamete and zygote in sexually reproducing organisms.
Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts:
(a) Female germ cell
(b) Male germ cell
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Write the names of male and female reproductive parts of a flower.
List any two differences between pollination and fertilisation.
Sketch the labeled diagram:
Flower with its sexual reproductive organs
Differentiate between self-pollination and cross-pollination.
Calyx : Sepals : : Corolla : ________________
Distinguish between self-pollination and cross-pollination.
Match the following
| 1. | Petal | Opuntia |
| 2. | Fern | Chrysanthemum |
| 3. | Phylloclade | Attracts insect |
| 4. | Hooks | Spore |
| 5. | Sucker | Bignonia |
In which part of the flower germination of pollen grains takes place?
In which of the following manner the arrangement of megaspores in a tetrad is observed in angiosperms?
The ovule of an angiosperm is technically equivalent to ______
Which type of development is observed in male gametophytes of plants?
Flowers showing ornithophily show few characteristic like ______.
Conidia are formed endogenously while zoospores are formed endogenously.
Variations occur as a result of ______
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- Fertilisation is a compulsory event
- It always results in formation of zygote
- Offspring formed are clones
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Give reason for the following:
Fertilization cannot take place in flowers if pollination does not occur.
Where is the zygote located in the flower after fertilization?
Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
In a plant flower the female whorl is ______.
