Are you trying to prepare yourself well in any chemistry topic by practicing the answers? We will make it easy for you. The solutions are provided by subject experts in a step-by-step fashion for each chapter in all the subjects. Further, these solutions are available for free. Download now!
Important questions based on NCERT syllabus for Chapter 12 - Reproduction in Plants:
Question-1: What happens in Pollination? What are self-pollination and cross-pollination?
Solution: Pollen grains have a tough protective coat and are light. They are carried by wind or water. Insects visit flowers and carry away pollen on their bodies. Some of the pollen land on the stigma of a flower of the same kind. The transfer of pollen from the anther to the stigma of a flower is called pollination. If the pollen lands on the stigma of the same flower, it is called selfpollination.
When the pollen of a flower lands on the stigma of another flower of the same plant
or that of a different plant of the same kind, it is called cross pollination.
Question-2: What do you understand about sexual reproduction in plants? Explain.
Solution: Plants that have flowers can reproduce sexually. A flower has a male reproductive part called stamen and a female reproductive part called pistil. A flower can be unisexual (containing one reproductive part only) or bisexual (containing both reproductive parts). Stamen has anther which produces male gametes called pollen grains. Pistil carries an ovary which produces female gametes called ovum. The male gametes fuse with the female gametes to form zygote and this
process is called fertilization. Later zygote transforms into a seed which is dispersed into the soil and under favourable conditions, it grows into a new plant.
Question-3: Explain different parts of a flower.
Solution: Following are the different parts of a flower:
a) Sepals- These are the green leafy parts of a flower that protect the flower in bud condition.
b) Petals- These are the bright colourful parts of a flower that attract insects for pollination.
c) Stamens- These are the male parts of a flower that contains pollen grains.
d) Pistils- These are the female parts of a flower that contains ovary.