Science worksheets for Class 7 — with answers

Answer the questions.

1. Which organ produces bile?
2. Which gas is released during photosynthesis?
3. Tiny pores on leaves are called ______.
4. Where does digestion of food begin in humans?
5. Name the raw materials for photosynthesis.
6. The process by which green plants make food is called ______.
7. Which animals chew the cud?
8. How does an amoeba take in food?
9. Fungi that feed on dead matter are called ______.
10. Lichens are a partnership of ______ and ______.

Answer the questions.

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

Answer the questions.

1. Name a base used to treat acidity in the stomach.
2. Solutions that are neither acidic nor basic are ______.
3. Acids taste ______; bases taste ______.
4. Name a natural indicator.
5. Vinegar contains ______ acid.
6. Turmeric turns ______ in a base.
7. Name an acid found in curd.
8. What is formed when an acid reacts with a base?
9. What colour does red litmus turn in a base?
10. The reaction of an acid with a base is called ______.

Answer the questions.

1. Coating iron with zinc is called ______.
2. Is rusting of iron a physical or a chemical change?
3. Is tearing paper a physical or a chemical change?
4. What gas is formed when vinegar reacts with baking soda?
5. A change in which a new substance is formed is a ______ change.
6. Is melting of ice a physical or a chemical change?
7. Is cooking food a physical or a chemical change?
8. Is burning of paper a physical or a chemical change?
9. Getting large crystals of a substance from its solution is called ______.
10. Is dissolving sugar in water a physical or a chemical change?

Answer the questions.

1. How do earthworms breathe?
2. The red pigment in blood is ______.
3. Which tissue carries water in plants?
4. Insects breathe through tiny holes called ______.
5. Breaking down food to release energy is called ______.
6. Yeast respires anaerobically and produces ______.
7. The kidneys remove waste from blood as ______.
8. How many chambers does the human heart have?
9. Respiration without oxygen is called ______ respiration.
10. Blood vessels that carry blood to the heart are ______.

Answer the questions.

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

Answer the questions.

1. Two or more cells joined together make a ______.
2. The heating effect of current is used in ______.
3. The wire in a heater is made of ______.
4. Why is a CFL or LED better than an ordinary bulb?
5. Which effect of current makes an electric bell ring?
6. Who showed that current makes a compass needle move?
7. Name one use of an electromagnet.
8. A coil of wire that becomes a magnet when current flows is an ______.
9. Draw (or name) the symbol of an electric cell.
10. Which modern switch replaces the fuse?

Answer the questions.

1. In a plane mirror, your right hand appears as the ______ hand.
2. The angle of incidence is ______ to the angle of reflection.
3. A lens that is thinner in the middle is a ______ lens.
4. Name the device that splits white light into seven colours.
5. The image in a plane mirror is ______ and the same size.
6. White light is made of ______ colours.
7. Which mirror do dentists use?
8. A spoon’s shiny inside surface acts like a ______ mirror.
9. A lens that is thicker in the middle is a ______ lens.
10. Which lens is used as a magnifying glass?