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प्रश्न
Distinguish between self-pollination and cross-pollination.
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उत्तर
In self-pollination, only one or two flowers borne on the same plant are involved, whereas in cross-pollination two flowers borne on two plants of same species are involved.
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संबंधित प्रश्न
Match the following:
| Column A | Column B |
| (i) Stigma | (a) Neuron |
| (ii) Pepsin | (b) Carpel |
| (iii) Dendrites | (c) Protein |
| (d) Stamen |
Name the parts labelled as A, B, C and D in the diagram given below:-
How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation.
State significance of pollination.
"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.
Mention the changes a flower undergoes after fertilisation.
The anther contains ______.
The fusion of male and female gametes is termed as ______.
Explain what you understand by sexual reproduction.
Sketch the reproductive parts of a flower.
Mature ovary forms the ______.
Name the male part of the flower.
Where is the female gamete formed in flowering plants?
Fill in the following blank with suitable word :
Flowering plants reproduce by ...........method of reproduction.
Explain the terms 'self pollination'
How do the insects help in cross-pollination?
Name the part of a seed which contains stored food.
How does pollination occur?
Describe the process of fertilisation in a flower with the help of labelled diagrams.
The length of pollen tube depends on the distance between :
(a) pollen grain and upper surface of stigma
(b) pollen grain on upper surface of stigma and ovule
(c) pollen grain in anther and upper surface of stigma
(d) upper surface of stigma and lower part of style
Put a tick mark (✓) against the correct alternative in the following statement
Pollen is produced in the:
State whether the following statement is true (T) or false (F):
Flowers which possess stamens and carpel are called unisexual.
In the figure, the parts marked A, B and C are sequentially:
(A) Plumule, Radicle and Cotyledon
(B) Radicle, Plumule and Cotyledon
(C) Plumule, Cotyledon and Radicle
(D) Radicle, Cotyledon and Plumule
What is phototropism?
Describe an activity to demonstrate phototropism.
Which of the following is not an unisexual flower?
a) Coconut
b) Papaya
c) Gulmohor
d) Maize
Sketch the labelled diagram.
Flower with its sexual reproductive organs.
Find the odd one out:
Find an odd one out.
Bisexual : Hibiscus : : Unisexual : ___________
Write the functions of sepals
Draw a neat and labelled diagram.
Double fertilization in angiosperms
Gloriosa superba exhibits ______.
The process of release of eggs from the ovary is called ______
Is the chromosome number of zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?
State the number of sets of chromosomes present in a zygote.
In a plant flower the female whorl is ______.
What are the agents for pollination?
Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male reproductive part.
