Science, about class 5

Amina grows maize in a wide field. She sees almost no insects near it. Yet the plants make seeds. How does the pollen travel?

1. AInsects carry it, but she cannot see them
2. BThe seeds need no pollen
3. CThe wind carries it
4. DRain carries it from flower to flower

Joseph plants a bean seed and a mango seed on one day. Two years later, what is most likely true?

1. AThe bean plant has died. The mango tree has no flowers yet.
2. BThe bean plant has died. The mango tree has fruit.
3. CBoth plants have made seeds many times.
4. DThe bean plant is a seedling. The mango tree has fruit.

A food chain is leaf → caterpillar → bird → cat. Which one eats an animal and is also eaten by an animal?

1. ALeaf
2. BCaterpillar
3. CCat
4. DBird

A pig eats roots, fruit and small animals. Which group is a pig in?

1. AHerbivore
2. BOmnivore
3. CCarnivore

Leila packs sandwiches for a long day out in the heat. Which way is best to carry them?

1. AIn a closed box, in the hot Sun
2. BIn an open basket, in the shade
3. COn open paper, in the hot Sun
4. DIn a closed box, in the shade

A pot boils in a cold kitchen. Drops of water form on the window glass. Where does this water come from?

1. AThe vapour from the pot, which cools on the glass
2. BFrom outside, through the glass
3. CThe cold glass, which makes new water

Hana puts a metal bowl of water in the hot sun. By evening there is less water. What can happen to the missing water later?

1. AIt is gone for ever
2. BIt stays in the air as vapour for ever
3. CIt can come back down as rain
4. DIt soaks into the sides of the bowl

A cyclist bends low over her handlebars on a flat road. Why does this help her go faster?

1. AGravity pulls on her less when she bends
2. BHer body meets less air, so air pushes back less
3. CThe air pushes her forward when she is low
4. DHer bike gets lighter when she bends

Kofi takes a mirror into a room with no light at all. What does he see in the mirror?

1. AHis face, a little dim, because mirrors glow a little
2. BHis face, because eyes can see in the dark
3. CA bright patch, because mirrors shine
4. DNothing, because a mirror only bounces light

Two rubber bands are the same length and equally tight. One is thin and one is thick. Which gives the higher note?

1. AThe thick one, because it has more to shake
2. BBoth give the same note, because they are the same length
3. CThe thin one, because it shakes faster

Sipho makes a tester with a small cell, a bulb and wires. There is a gap in the loop. He lays one thing across the gap. The bulb lights. Which thing was it? Never test with a wall socket.

1. AA dull grey iron key
2. BA shiny red plastic comb
3. CA shiny glass marble
4. DA smooth wooden spoon

Late at night, Ravi sees an eclipse of the Moon. His cousin lives far away, where it is midday then. Can his cousin see it?

1. AYes, because the Moon is always in the sky
2. BNo, because it is day there and the Moon is hidden
3. CNo, because only people in a narrow strip can see it
4. DYes, if he looks through dark glasses

Priya is at a festival. She stands next to a big loudspeaker. The music is very loud, but it does not hurt. What should she do?

1. AStay there, because it does not hurt
2. BTurn her back to the loudspeaker
3. CMove further away from the loudspeaker
4. DStay close until her ears start to ring

Sipho counts his pulse for 15 seconds. At rest he counts 18 beats. After a run he counts 31 beats. How many more beats a minute is his pulse after the run? Run only on open ground, and stop if you feel ill.

Mei floats a model boat in a big tub of water. The boat weighs 3 N. She puts 5 stones in it. Each stone weighs 2 N. The boat floats and stays still. How big is the upthrust on the boat?

Ravi holds a leaf 5 cm wide in front of a lamp. The lamp is 8 steps from the wall. The leaf is 2 steps from the lamp. How wide is the shadow of the leaf on the wall? Never look into the lamp.

Diego's friend whistles behind him, and Diego hears it. Explain how the sound gets from the air to his brain.

Mei sees a thin curved Moon. A few nights later she sees a half Moon. She says the Earth's shadow is moving off the Moon. Is she right? Explain.

Joseph eats maize porridge, then rice, then cassava. He eats nothing else that day. He drinks clean water all day. Is his day balanced? Explain.

(a)Switch P is closed. Switch Q is open. What does the bulb do? [1 mark]

1. AIt lights, because switch P comes before the bulb
2. BIt stays dark, because switch Q leaves a gap
3. CIt lights, but it is dim
4. DIt lights, because one closed switch is enough

(b)Lucía closes both switches. The bulb still stays dark. She looks at the cell. Both wires touch its knob end. Nothing touches the flat end. Why is the bulb dark? How should she fix it? [2 marks]

(c)Lucía fixes it, and the bulb lights. Next she makes a loop with one cell and two bulbs. The bulbs are the same kind. Both bulbs light, and they are equally dim. Her brother says the first bulb uses up some electricity. Is he right? Explain why. [2 marks]