Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

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. Is burning of paper a physical or a chemical change?
4. Is rusting of iron a physical or a chemical change?
5. Is cooking food a physical or a chemical change?
6. Coating iron with zinc is called ______.
7. Name one way to prevent rusting.
8. Is tearing paper a physical or a chemical change?
9. What gas is formed when vinegar reacts with baking soda?
10. Getting large crystals of a substance from its solution is called ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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