Reproduction In Plants - Class 7 Biology - Extra Questions

Name the male part of a flower. Write names of its parts and draw a diagram:

$$\textbf{Solution:}$$

 $$\bullet$$The androecium is the male reproductive part of flowers. 
 $$\bullet$$It is composed of stamens. 
 $$\bullet$$Each stamen consists of an anther and a filament. 
 $$\bullet$$In the microsporangium of the anther, pollen grains are produced.




Name the female part of a flower. Draw a diagram and label the parts.

The pistil is the ovule producing, female reproductive part of a flower. It is the innermost part of a flower. The pistil consists of three parts: 
(i)   Stigma- The flat, sticky upper portion, where the pollen grain from the male plant is collected.
(ii)  Style- The stalk that extends below the stigma, which leads the male gametes to the ovary.
(iii) Ovary- The swollen base which contains the ovules (eggs). Fertilization takes place in this region.

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Fill in the blank with appropriate words.
A carpel is composed of three parts ________, _______ and ________.

A carpel is composed of three parts stigma, style and ovary.


In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.

When the stamens of a bisexual flower are removed artificially, cross pollination takes place. This ensures fertilization. Due to this, flower is able to produce fruit.


Write characteristics of the pollen formed in wind-pollinated flowers.

Wind pollinated flowers produce pollen in large amount and the pollen is small, dry, light and smooth so that they can be blown by the wind to a great distance.


Write two ways in which pollination may occur in plants.

The ways pollination may occur in plants: - 
(a) Self-pollination
(b) Cross-pollination


What is pollination? How does it lead to fertilization? Explain with the help of diagram.

The process of transfer of pollen grains from anther to the stigma of the flower of a plant of same species is known as pollination. The fusion of male and female gametes take place only after pollination. 
The pollen grains are deposited on the stigma by pollination. The pollen grains germinate on stigma producing a tube known as pollen tube. The pollen tube grows downward into the style and reaches to ovary. Finally it enters into the ovule through a minute pore. Here one male gamete fuses with egg. It is the act of actual fertilization by which production of zygote and development of embryo take place.
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What is a flower containing both the male and female reproductive parts called?

A flower containing both male and female reproductive parts is called a bisexual flower.


Class 7 Biology Extra Questions