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प्रश्न
Give scientific reason.
Flower is a structural unit of sexual reproduction in plants.
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उत्तर
Flower is structural unit of sexual reproduction in plants. It consists of four floral whorls as calyx, corolla, androecium and gynoecium; arranged in sequence from outside to inside. Androecium and gynoecium are called 'essential whorls' because they perform the function of reproduction whereas calyx and corolla are called as 'accessory whorls' because they are responsible for protection of inner whorls.
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:-
In the following diagram showing the structure of embryo of a dicot seed, what are the parts marked I, II and III sequentially?
Give one example of a unisexual flower.
Name the part made up of the stigma, style and ovary.
Name the swollen lower part of the carpel.
Where are the pollen grains produced?
What is the name of female organ of a flower (other than carpel)?
Where is the male gamete formed in flowering plants?
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.......... at the base of the carpel contains egg cells.
Explain the terms 'cross-pollination'?
Name the part of a seed which grows into shoot.
Describe the process of fertilisation in a flower with the help of labelled diagrams.
(a) Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel.
(b) What name is given to (i) all the petals of a flower, and (ii) all the sepals of a flower?
(c) What are (i) stamen, and (ii) carpel, in a flower?
(d) What is the other name of carpel of a flower?
(e) What is the name of yellow powdery substance present in the anther of a flower?
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 by selecting suitable word:
A flower that bears both the male and the female parts is known as __________ flower.
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.
Mention the function of Stigma.
Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label (i) ovary, (ii) male germ-cell, (iii) female germ-cell and (iv) ovule on it.
List any two differences between pollination and fertilization.
What is cleistogamy? Write one advantage and one disadvantage of it, to the plant.
Find an odd one out.
Distinguish between self-pollination and cross-pollination.
The male reproductive part of a flower is ______.
Match the following
| 1. | Petal | Opuntia |
| 2. | Fern | Chrysanthemum |
| 3. | Phylloclade | Attracts insect |
| 4. | Hooks | Spore |
| 5. | Sucker | Bignonia |
Identify the parts A, B, C, and D?
Write the events involved in the sexual reproduction of a flowering plant.
a. Discuss the first event and write the types.
b. Mention the advantages and the disadvantages of that event.
The ovule of an angiosperm is technically equivalent to ______
Sperm and egg nuclei fuse due to ______.
Give reason for the following:
Fertilization cannot take place in flowers if pollination does not occur.
Give any two examples of agents of pollination.
In a plant flower the female whorl is ______.
What is puberty?
Explain the post fertilization changes that occur in the ovary of a flower.
In male reproductive whorl of a flower the archesporial cells are formed by ______.
The number of pollen sacs in a dithecous anther is ______.
