Page 17 - Active Science 5 Ebook and Activity

5. Crop protection: Crops need to be
protected from herbivorous animals. Scarecrow

For this, a fence is created around the
field. Pests like mice, rats and insects
are also killed by spraying chemicals
called insecticides and pesticides.

DDT and gammaxene are some
common insecticides. Scarecrows are Harvesting
put up in fields to ward off birds.

6. Harvesting: When the crop is ripe, Let’s Pronounce Together

it is cut down. This process is known
as harvesting. It can be done by the irrigation cotyledons
farmers manually or with the help of dispersal germination
harvesting
rabi
machines.
kharif

LET’S
REVISE

• Plants reproduce through seeds or through their different parts.
• A seed consists of a seed coat, micropyle, embryo and cotyledons.

• A seed needs air, water and sunlight to germinate.
• Dispersal of seeds is important for plant survival.

• A crop is a cultivated plant that is grown on a large scale.

• Crops grown from June to October are known as kharif crop while crops grown from
November to April are known as rabi crops.

Glossary

• Reproduction : Process of producing babies of their own kind by living things.

• Germination : The process by which seed grows into a new plant.
• Seed dispersal : The process of spreading seeds to different places.

• Ploughing : The process of loosening the soil for sowing seeds.
• Irrigation : The process of watering the soil.

• Manuring : The process of adding manure to fields.
• Insecticides : Chemicals used to kill insects in the field.

• Harvesting : The process of cutting fully grown crops from fields.
• Kharif crops : The crops sown from June to October.
• Rabi crops : The crops sown from November to April.

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Active Science-5