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प्रश्न
Describe the process of fertilisation in a flower with the help of labelled diagrams.
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उत्तर
Fertilisation occurs after pollen grains fall on the stigma. Upon falling on the stigma, the pollen grains burst and grow a pollen tube taht passes downwards from the style to the ovary containing the ovule. The male gamete present in the pollen moves downward through the pollen tube and reaches the ovule. This gamete fuses with the egg to form a zygote. This process is known as fertilisation.
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संबंधित प्रश्न
In the following diagram showing the structure of embryo of a dicot seed, what are the parts marked I, II and III sequentially?
The fusion of male and female gametes is termed as ______.
The process of fusion of the male and female gametes is called ______.
Fill in the following blank with suitable word :
The male organ of reproduction in the flower is the.......... .
Draw a neat sketch of the stamen of a flower. Mark in it filament and anther.
Give some examples of different modes of fertilisation in nature?
Mention the function of Anther.
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.
“Cell division is a type of reproduction in unicellular organism.” Justify.
Define.
Inflorescence
The male reproductive part of a flower is ______.
Generally, in a pollen tube, which of the following moves to the tip of the tube?
The 3-celled egg apparatus at the micropylar end comprises of ______
Complete the table
| Carly x | ______ | ______ |
| ______ | petal | attract insects |
| Androecium | ______ | Male reproductive part |
| ______ | ______ | Female reproductive part. |
Give reason for the following:
Fertilization cannot take place in flowers if pollination does not occur.
Draw the diagram of a flower and label the four whorls. Write the names of gamete producing organs in the flower.
Give any two examples of agents of pollination.
What is the structural unit of sexual reproduction in plant?
Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male reproductive part.
