Class 7 – Science Question Paper
Time: 3 Hours Max Marks: 80
SECTION A – OBJECTIVE (20 marks)
Q1. MCQs (1 × 10 = 10)
- The small openings on the sides of a cockroach’s body through which air enters are called:
(a) Stomata (b) Spiracles (c) Gills (d) Pores - In earthworm, exchange of gases takes place through:
(a) Lungs (b) Skin (c) Gills (d) Spiracles - Which component of blood helps in clotting when we get a cut?
(a) RBC (b) WBC (c) Plasma (d) Platelets - The number of oscillations per second is called:
(a) Time period (b) Frequency (c) Speed (d) Pulse - The process in which heat is transferred in solids without actual movement of particles is called:
(a) Conduction (b) Convection (c) Radiation (d) Evaporation - The continuous movement of water up as vapour and down as rain, snow or hail is called:
(a) Water harvesting (b) Water cycle (c) Infiltration (d) Aquifer - Adolescents should avoid substances like tobacco and alcohol because:
(a) They are fashionable
(b) They are addictive and damage health
(c) Everyone uses them
(d) They are cheap - Mood swings and increased sensitivity are examples of:
(a) Physical changes (b) Emotional changes
(c) Excretory changes (d) Nutritional changes - Which of the following is not a part of the human excretory system?
(a) Kidney (b) Ureter (c) Uterus (d) Urinary bladder - The meter used in vehicles to show instantaneous speed is called:
(a) Speedometer (b) Odometer (c) Chronometer (d) Thermometer
Q2. Fill in the blanks. (1 × 5 = 5)
- The number of heartbeats per minute is called __________.
- Breathing involves movement of ribs and a muscular sheet called __________.
- Houses in very cold regions sometimes have double wooden walls filled with mud because mud is a __________ conductor of heat.
- The time taken by a simple pendulum to complete one oscillation is its __________.
- The movement of cooler air from land to sea at night is called __________.
Q3. True or False. (1 × 5 = 5)
- A cheetah moving with changing speed shows uniform motion. [ ]
- All living organisms, including plants, respire. [ ]
- Platelets help in fighting diseases. [ ]
- Hormones influence mood and behaviour during adolescence. [ ]
- Radiation needs air as a medium to transfer heat. [ ]
SECTION B – SHORT ANSWER
Q4. Answer the following. (3 × 5 = 15)
- What is cellular respiration? Why is it called so?
- Explain briefly how urine is formed and eliminated from the human body.
- Define conduction, convection and radiation (only definition + one example each).
- What is a distance–time graph? Write any two advantages of using a distance–time graph.
- Mention any three healthy lifestyle tips for adolescents related to nutrition, exercise and sleep.
Q5. Answer the following. (5 × 3 = 15)
- Describe the mechanism of breathing in humans. Explain what happens to ribs and diaphragm during inhalation and exhalation.
- Describe an activity to compare the temperature changes in soil and water kept in sunlight. What conclusion do you draw from this about land and sea breeze?
- Explain how transpiration and water absorption by roots are connected to the water cycle.
SECTION C – LONG ANSWER
Q6. Answer the following. (5 × 3 = 15)
- (a) Define speed.
(b) A cyclist covers 600 m in 2 minutes. Calculate his speed in m/s and km/h.
(c) Is his motion uniform or non-uniform if he covers equal distances in equal time intervals? - Explain the structure and function of blood. Describe RBC, WBC, platelets and plasma – one function each.
- What is adolescence? Explain:
- (a) Physical changes
- (b) Emotional changes
- (c) Social responsibilities of adolescents
Q7. Answer any ONE. (5 × 1 = 5)
- Describe the process of respiration in plants. How do roots and leaves exchange gases with their surroundings?
OR
- What is rainwater harvesting and why is it important for maintaining groundwater level? Suggest any four methods or ideas to conserve water in your surroundings.
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