Answer the following questions.
(a)What is meant by migration?
Answer: Migration is the seasonal movement of animals from one region to another for breeding, finding food, or better climate.
(b) Describe the lifecycle of birds.
Answer: The lifecycle of birds: Egg → Hatchling (chick) → Nestling → Fledgling → Adult bird.
(c) Give two causes of air pollution.
Answer:
- Smoke from vehicles and factories
- Burning of fossil fuels and garbage
(d) For what purpose do we use land obtained by clearing forests?
Answer:
We use cleared forest land for agriculture, building houses, industries, and roads.
Give reasons.
(a) It is important to conserve the living components of the environment.
Answer:
Because all living things are interconnected in ecosystems. They help maintain balance—like plants producing oxygen, animals pollinating plants, and decomposers recycling nutrients.
(b) The numbers of wild animals are falling day by day.
Answer:
Due to habitat destruction, hunting, pollution, and climate change reducing their living space and food sources.
True or false?
(a) Dead plants and animals are abiotic components.
Answer: False
Dead plants and animals were once living, so they are biotic components. Abiotic components are non-living things like air, water, and sunlight.
Activities
1. Collect information about the work of WWF – World Wide Fund for Nature.
Answer:
WWF works to protect endangered species, conserve natural habitats, and address threats like climate change and deforestation worldwide.
2. In the activity on page 89 you studied some news items. Find out what is done in your neighbourhood to prevent such harm to living things.
Answer:
(Example) In my neighbourhood, we have:
- Tree plantation drives
- Ban on plastic bags
- Proper waste disposal systems
- Awareness programs to protect local animals