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Download 7th Class General Science Notes (Unit-4) for Islamabad Model Schools & Colleges

Download 7th Class General Science Notes (Unit-4) for Islamabad Model Schools & Colleges

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Download 7th Class General Science Notes (Unit-4) for Islamabad Model Schools & Colleges

SHORT QUESTIONS

What is an ecosystem?
Living organisms interacting with one another and their environment form a balanced system called an ecosystem.

Define the term habitat.
A habitat is a place where an organism lives.

What does adaptation mean?
The process of change by which an organism or species becomes better suited to its environment is called adaptation.

Define population and community.
·         A group of organisms of same species living in same habitat is called population.
·         All the organisms of different species living in some particular area form community.

Draw a simple food chain.
Description: http://www.thunderboltkids.co.za/Grade5/01-life-and-living/images/5.20.png
LONG QUESTIONS

Explain how the fish is adapted to aquatic habitat.
Fish have streamlined bodies, evenly distributed fins, pointed head with relatively large mouth and forked tail to help them swim through the water.

Identify the factors that cause daily and seasonal changes in a habitat.
Sunlight:
It is used by plants to prepare food. All organisms depend on plants for food directly or indirectly. Intensity of sunlight affects on number of plants which affects on population.
Temperature:
It also plays important role in change of habitat. Extreme hot or cold conditions affect the organism.
Water:
It is very important for living things. Availability of water results in number of populations to live in that particular area.
Outbreak of epidemics:
Outbreak of epidemics has disastrous effects on populations of different organisms.
Migration:
Migration of animals and birds results in increase or decrease of size of population.

Describe the adaptations of aquatic animals to live in their habitat.
·         Aquatic animals have streamlined bodies which helps them to move in water easily. For example Fish have streamlined bodies, evenly distributed fins, pointed head with relatively large mouth and forked tail to help them swim through the water.
·         Aquatic plants have long stems so that their leaves can float near the surface of water to get light. The stems of water plants have cavities in them through which air can pass to roots.

Explain a food web with the help of an example.
Many interconnected food chains form a network called food web.
Example:
·         A jackal does not always eat a rabbit, but it also eats goat, hen etc.
·         Similarly a lion does not feed on deer. It also hunts for cows, goats and some other animals.
·         In this way mostly animals feed on more than one kind of animal.



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Download Class Notes: Download 7th Class General Science Notes (Unit-4) for Islamabad Model Schools & Colleges
Download 7th Class General Science Notes (Unit-4) for Islamabad Model Schools & Colleges
Download 7th Class General Science Notes (Unit-4) for Islamabad Model Schools & Colleges
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