Science worksheets for Class 7 — with answers

Answer the questions.

1. Name the longest part of the alimentary canal.
2. Fungi that feed on dead matter are called ______.
3. Name the raw materials for photosynthesis.
4. How does an amoeba take in food?
5. The process by which green plants make food is called ______.
6. Where does digestion of food begin in humans?
7. Tiny pores on leaves are called ______.
8. Plants like Cuscuta that take food from other plants are called ______.
9. Lichens are a partnership of ______ and ______.
10. Which gas is released during photosynthesis?

Answer the questions.

1. The normal temperature of the human body is ______.
2. Name the three ways heat travels.
3. Why does a clinical thermometer have a kink?
4. Why do woollen clothes keep us warm?
5. Name two good conductors of heat.
6. Why do we wear light-coloured clothes in summer?
7. Heat moves through solids by ______.
8. How does heat from the Sun reach us?
9. Heat moves through liquids and gases by ______.
10. A wind blowing from the sea to the land is called a ______.

Answer the questions.

1. Name an acid found in lemon.
2. Turmeric turns ______ in a base.
3. Name a base used to treat acidity in the stomach.
4. What colour does blue litmus turn in an acid?
5. Acids taste ______; bases taste ______.
6. Name an acid found in curd.
7. What colour does red litmus turn in a base?
8. Solutions that are neither acidic nor basic are ______.
9. Why do we rub baking soda on an ant bite?
10. Vinegar contains ______ acid.

Answer the questions.

1. A change in which a new substance is formed is a ______ change.
2. Is dissolving sugar in water a physical or a chemical change?
3. Name one way to prevent rusting.
4. Is rusting of iron a physical or a chemical change?
5. What gas is formed when vinegar reacts with baking soda?
6. What two things are needed for iron to rust?
7. Is burning of paper a physical or a chemical change?
8. Getting large crystals of a substance from its solution is called ______.
9. Is tearing paper a physical or a chemical change?
10. Is cooking food a physical or a chemical change?

Answer the questions.

1. Insects breathe through tiny holes called ______.
2. Blood vessels that carry blood away from the heart are ______.
3. Yeast respires anaerobically and produces ______.
4. Which tissue carries water in plants?
5. Respiration without oxygen is called ______ respiration.
6. Which tissue carries food in plants?
7. How many chambers does the human heart have?
8. Loss of water from leaves as vapour is called ______.
9. The red pigment in blood is ______.
10. Why do we get muscle cramps after heavy exercise?

Answer the questions.

1. Motion with changing speed is called ______ motion.
2. What is the SI unit of speed?
3. A car covers 120 km in 2 hours. Find its speed.
4. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
5. The time taken by a pendulum for one oscillation is its ______.
6. A train moves at 80 km/h for 3 hours. How far does it go?
7. Which instrument shows the distance covered by a vehicle?
8. Which instrument shows the speed of a vehicle?
9. Speed = ______ ÷ ______
10. Name two ways people measured time in the past.

Answer the questions.

1. Name one use of an electromagnet.
2. The wire in a heater is made of ______.
3. A coil of wire that becomes a magnet when current flows is an ______.
4. The heating effect of current is used in ______.
5. Draw (or name) the symbol of an electric cell.
6. Why is a CFL or LED better than an ordinary bulb?
7. Which modern switch replaces the fuse?
8. Who showed that current makes a compass needle move?
9. A safety device that melts when too much current flows is a ______.
10. In a circuit, the bulb glows only when the switch is ______.

Answer the questions.

1. Which lens is used as a magnifying glass?
2. The splitting of white light into colours is called ______.
3. White light is made of ______ colours.
4. Name a natural example of white light splitting into colours.
5. Which mirror do dentists use?
6. A lens that is thicker in the middle is a ______ lens.
7. In a plane mirror, your right hand appears as the ______ hand.
8. The angle of incidence is ______ to the angle of reflection.
9. Which mirror is used as the rear-view mirror in vehicles?
10. A lens that is thinner in the middle is a ______ lens.