P5 Science Revision

The picture shows a female white tiger and her cub at the Singapore Zoo.

Why does the cub look like his mother?

Genetic information is passed to him from his mother’s _______________________.

• milk

• egg

• blood

• ovule

Xiao Mi noticed that one of her flowering plants did not bear fruit. What could be the possible reasons?

A : The flowers have no seeds.

B : The flowers have only male parts.

C : The flowers have only female parts.

D : The flowers have not been pollinated.

• A and B only

• A and C only

• B and D only

• A, B, C and D

The diagram shows the cross-section of 2 flowers, X and Y.

What process do the arrows in the diagram represent?

• Pollination

• Fertilisation

• Germination

• Seed dispersal

Study the following statements that describe the reproduction cycle of a flowering plant.

V : Fertilisation takes place.

W : Pollen grains are released.

X : Stigma receives the pollen grains.

Y : Pollen tube grows towards the ovules.

Z : Fruits with seeds are developed and dispersed.

Which of the following shows the correct sequencing of the stages in the reproduction cycle of a flowering plant?

• Z → W → X → Y → V

• X → Y → V → W → Z

• W → X → Y → V → Z

• V → Z → W → X → Y

During Science lesson, Mr Tan got the pupils to carry out an experiment. The pupils were required to find out how Balsam plants grow under certain conditions. The steps on how to carry out the experiment were as below.

Step 1 : Fill 2 identical pots with similar 500g of soil.

Step 2 : Place 4 similar seeds in the first pot.

Step 3 : Place 15 similar seeds in the second pot.

Step 4 : Place both pots in the garden.

Step 5 : Water both pots daily with the same amount of water.

What was the aim of the above experiment?

The pupils were trying to find out if ________________________.

• plants grow from seeds

• plants grow well in the soil only

• overcrowding can affect plant growth

• fertilisers are compulsory for plant growth

After a heavy rain, Zul noticed that there were puddles of water on the Parade Square in the school.

After a few hours, there were still some puddles of water on the Parade Square. What was the likely cause of this observation?

A : The rate of evaporation was high.

B : The surrounding temperature was low.

C : There was no wind that day.

D : The exposed surface area of the puddles was large.

• A and B only

• B and C only

• C and D only

• B, C and D only

Uncle Sam was preparing a mug of tea. He poured the hot tea from one mug to another at a distance as shown in the diagram.

How does Uncle Sam’s action help to cool the tea faster?

The hot tea from Mug A ________________________________.

• gains heat from the mug itself

• loses heat to Mug B from a height

• loses heat to the cool surrounding air

• gains heat from the cool surrounding air

Three identical towels, A, B and C containing the same amount of water were folded into different sizes and placed in the balcony to dry. After four hours, each towel was weighed. The results were then recorded and plotted on a graph.

Which of the following pairs of labels is most suitable for X and Y of the graph?

• X: Time taken Y: Exposed surface area of towels

• X: Exposed surface area of towels Y : Time taken

• X : Time taken Y: Mass of towels

• X: Exposed surface area of towels Y: Mass of towels

Study the set-ups.

The set-ups are placed on a table in a room at 28°C.

Which of the set-ups, W, X, Y and Z, correctly show(s) the formation of water droplets?

• X only

• W and Z only

• W, Y and Z only

• W, X and Z only

Study the two diagrams.

How are the clouds in the sky and the mist formed around the spout of a kettle of boiling water similar?

A : Both are made up of water vapour.

B : Both are made up of water droplets.

C : Both are formed by evaporation of water.

D : Both are caused by heat lost to the surrounding air.

• A and C only

• A and D only

• B and C only

• B and D only