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प्रश्न
What is seed?
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उत्तर
A seed is a fertilised and mature ovule that contains an embryo and can grow into a new plant under favourable conditions.
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संबंधित प्रश्न
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
How is the process of pollination different from fertilization?
The anther contains ______.
A flower may have either male or female reproductive parts. Such a flower is called ______.
State the name of the functional unit concerned with sexual reproduction.
Name the swollen lower part of the carpel.
What is the name of female part of a flower?
Fill in the following blank with suitable word :
The female organ of reproduction in the flower is the...........
In tobacco plant, the male gametes have 24 chromosomes.
What is the number of chromosomes in the zygote?
Describe the process of fertilisation in a flower with the help of labelled diagrams.
What changes take place in the flower after fertilisation which lead to the formation of seeds and fruit?
| 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?
Mention pollination types.
In which part of the flower germination of pollen grains takes place?
Where does the endothecium layer of anther lobes is present?
Conidia are formed endogenously while zoospores are formed endogenously.
Pollen grains are produced by ______
The figure below shows the concept of double fertilization. Complete the flow chart showing the progress at each step:
Triple fusion involves ______.
The number of pollen sacs in a dithecous anther is ______.
