Energy
Which energy conversion takes place in a burning candle?
A. Chemical → Light + Heat
B. Heat → Chemical
C. Light → Chemical
D. Heat → Sound
A) Chemical → Light + Heat
Which factor increases the friction between two surfaces?
A. Smoothness
B. Roughness
C. Heat
D. Shape
B. Roughness
Which organ removes carbon dioxide from the body?
Lungs
Which stage of the butterfly life cycle comes after pupa?
A. Egg
B. Larva
C. Adult
D. Nymph
C. Adult
Which of the following is a non-living thing?
A. Mushroom
B. Coral
C. Rock
D. Seaweed
c) Rock
A solar panel converts ______ energy into electrical energy.
Light
Which force pulls objects towards the centre of Earth?
Gravity
State one function of the small intestine.
Absorbs digested food into the bloodstream.
Which reproductive part of a flower produces pollen?
Answer: Anther
Which group does a frog belong to?
Answer: Amphibians
Which appliance converts electrical energy into sound and light?
A television
Name a pair of materials will attract each other due to magnetism
Iron and steel
Name 2 difference that Plant cells differ from animal cells
Plants have cell wall and chloroplasts but animal cell does not
In the water cycle, clouds are formed high up in the sky. Why do clouds not form on very hot, dry days?
Condensation of water vapour into tiny water droplets. There is not enough water vapour in the air for condensation to occur.
Give one way flowering plants differ from non-flowering plants.
Flowering plants produce seeds inside fruits; non-flowering do not.
Which is the main reason why condensation forms on the outside of a cold drink can?
Water vapour in the air cools and condenses
Two balls of different masses (one heavy, one light) are dropped from the same height in a vacuum chamber and in open air.
(a) Which ball will hit the ground first in the vacuum chamber?
(b) Which ball will hit the ground first in open air, and why?
(a) Both hit the ground at the same time (no air resistance, only gravity acts).
(b) The heavier ball reaches the ground first in open air, because air resistance has less effect on it compared to the lighter ball.
Why does the heart beat faster when you run?
To pump more oxygen and nutrients to muscles so they can release more energy for activity.
(a) Name the process by which water changes into water vapour.
(b) Explain why clothes dry faster on a hot, windy day.
(a) Evaporation
(b) Heat increases the rate of evaporation, and wind blows away water vapour, allowing more water to evaporate quickly.
State two differences between insects and arachnids (Spider).
Insects: 3 body parts, 6 legs, usually wings.
Arachnids: 2 body parts, 8 legs, no wings.
(a)Heat always flows from a hotter object to a cooler one. True /False
(b)Why does a metal spoon feel colder than a wooden spoon in the same hot soup?
a) True
b) Metal is a better conductor of heat, so it conducts heat away from your hand faster.
Why does a ball eventually stop rolling on the ground?
State one disadvantage of friction.
Answer: Friction and air resistance oppose its motion.
Answer: Causes wear and tear on moving parts.
(a) Name the part of the leaf that controls the exchange of gases.
(b) After several days, the leaves facing the window look healthier and greener than those facing the wall. Explain why.
(a) Stomata
(b) Leaves facing the window receive more light, so they can photosynthesise more, producing more food and keeping them greener and healthier.
(a) Name all four stages in the life cycle of the butterfly.
(b) State one way the larva differs from the adult.
(c) Explain why butterflies lay many eggs at one time.
(a) Egg → Larva (caterpillar) → Pupa (chrysalis) → Adult (butterfly)
(b) Larva does not have wings / larva eats leaves, adult drinks nectar.
(c) To increase the chances of survival, since many eggs/young may be eaten by predators.
A farmer notices that few of his crop plants are producing fruits.
(a) Suggest one reason why pollination may not have taken place.
(b) How could the farmer solve this problem?
(c) Explain how pollination is related to fertilisation.
(a) Few pollinators (e.g. bees, butterflies) present / flowers not suited to wind pollination.
(b) Introduce more pollinators / hand-pollinate the flowers.
(c) Pollination transfers pollen to the stigma. Fertilisation happens when the male nucleus from pollen fuses with the female nucleus in the ovule.