Match the following. 1. Lever a. In steering wheel 2. Pulley b. Slider in the park 3. Wheel and axle c. To cut a large piece of wood 4. Wedge d. Scissors to cut paper 5. Screw e. To draw water from well 6. Inclined plane f. To hold two pieces of wood together

A lever is a rigid board or bar that turns on a support point. It is used to lift or move heavy objects, cut things, and open tin lids.Scissors are examples of this. A pulley is a simple machine that has a grooved wheel with rope running between the grooves of the wheel. It is used to draw water from the well. Wheels and axles are used to lift heavy weight. The wheel and axle enable a small force applied at the wheel to move a heavy object at the axle. The steering wheel is an example of this. A wedge has one or two slanting or inclined planes that together form a sharp edge. It is used in cutting, splitting, and piercing tools. A screw looks like a nail wrapped with grooves, but actually it is an inclined plane wrapped around a rod with a pointed end. It is used to hold two things tightly together. An inclined plane is a sloping surface that makes it easy to raise or lower a load. A smaller effort is needed to move a heavy object up an inclined plane than to lift it straight up. Lever Scissors to cut paper Pulley To draw water from well Wheel and axle In steering wheel Wedge To cut a large piece of wood Screw To hold two pieces of wood together Inclined plane Slider in the park

transfers a force from one place to another

changes the direction of a force

increases the magnitude of a force

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Give a scientific reason for the following.

Farmers add fertilizers or manure to the fields.

Important Questions on Garbage in, Garbage out

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Early man used horses to plough the field.

EASY

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How are dams utilised for irrigation purposes?

HARD

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Define agriculture. What are the various steps involved in agriculture?

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_____ leaves keep the insects away.

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Traps may be used to catch _____. (cats/ rodents)

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Synthetic fertilisers used should be _____ soluble.

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Fill in the blank using the option given in the bracket:
[bullock, sheep, tractor, cart]
The early man used the _____ to plough the field.

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Chemical fertilizers and pesticides help plants to grow quickly. They also help plants to give more fruit. However, some people say that using fertilizers is not good for plants, and that it would be better for farmers to use natural (organic) fertilizers. What do you think? Find out what you can about organic farming.

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Wheat requires _____ (less/more) water.

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A doorknob is an example of:

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What do we add to soil to make it more fertile?

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Most crops are grown from _____.

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Science>Biology>Garbage in, Garbage out>Dealing with Garbage

Dried neem leaves are used while storing silk clothes.

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Match the following.

1. Lever	a. In steering wheel
2. Pulley	b. Slider in the park
3. Wheel and axle	c. To cut a large piece of wood
4. Wedge	d. Scissors to cut paper
5. Screw	e. To draw water from well
6. Inclined plane	f. To hold two pieces of wood together