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प्रश्न
How do the insects help in cross-pollination?
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उत्तर
When an insect sits on a flower, the pollens from the anther stick to their wings. The same insect when sits on another flower, the pollens from its wings stick to the stigma of that flower thereby affecting pollination.
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संबंधित प्रश्न
Name the parts A, B and C shown in the diagram and write their functions.
Name the parts labelled as A, B, C and D in the diagram given below:-
Write the names of those parts of a flower which serve the same function as the following do in the animals :
(i) testis,
(ii) sperm,
(iii) ovary,
(iv) egg
Fill in the following blank with suitable word :
The female organ of reproduction in the flower is the...........
What is seed? What are the parts of a seed? Explain with the help of a labelled diagram.
What is pollination? How does pollination occur?
The part of a seed which grows and develops into root on germination is :
(a) cotyledon
(b) plumule
(c) follicle
(d) radicle
Fill in the blank:
Seeds are formed from________.
State whether the following statement is true (T) or false (F):
Flowers which possess stamens and carpel are called unisexual.
The students of a class were asked by the teacher to study the different parts of an embryo of an angiosperm. Given below are the essential steps for the experiment :
A. Soak the seeds in plain water and keep them overnight.
B. Cut open the soaked seed and observe its different parts.
C. Take some healthy seeds in a petri-dish.
D. 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) C, A, D, B
(b) C, D, A, B
(c) A, C, D, B
(d) A, C, B, D
Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:
Pollen grain, male gamete, female gamete, ovary.
Draw a diagram of the longitudinal section of a flower and label the following parts.
__________ is present in unisexual flower.
Give scientific reason.
Flower is a structural unit of sexual reproduction in plants.
Draw a neat and labelled diagram.
Double fertilization in angiosperms
Where does the endothecium layer of anther lobes is present?
Conidia are formed endogenously while zoospores are formed endogenously.
The process of release of eggs from the ovary is called ______
The ovaries of different flowers may contain ______.
Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
