Seed Dispersal Observation - Tree Q

Bala wanted to find out how tree Q (▲) disperses its seeds and observed its position as shown. A few years later, he observed more trees Q growing in the same area as shown. Which of the following correctly describes the characteristics of the fruits of tree Q?

• fibrous husk

• pod-like structure

• wing-like structure

• hook-like structure

Based on the diagrams, which part of the flower has a similar function as Part A?

• W

• X

• Y

• Z

Study the life cycle of a plant as shown. Which of the following is correct?

• A: Young plant, B: Adult plant, C: Pollination, fertilisation and dispersal

• A: Young plant, B: Adult plant, C: Germination and pollination

• A: Adult plant, B: Young plant, C: Dispersal and pollination

• A: Adult plant, B: Young plant, C: Dispersal and fertilisation

The diagrams show two magnets being brought close to each other. Which of the following would result in the greatest repulsion between the two magnets?

• (1) [Diagram: N S | S]

• (2) [Diagram: N S S N]

• (3) [Diagram: N S N S]

• (4) [Diagram: N S | S N]

Jamie used a syringe as shown to remove some air from an empty container by pulling the plunger upwards. Which of the following correctly describes how the mass and volume of the air in the container change?

• Mass of air: Decreases, Volume of air: Decreases

• Mass of air: Decreases, Volume of air: Remains the same

• Mass of air: Remains the same, Volume of air: Decreases

• Mass of air: Remains the same, Volume of air: Remains the same

The table shows the properties of four materials, P, Q, R and S. A tick (✓) indicates that the material has the property listed. Tommy wants to use one of the materials to make a coffee cup as shown. Which of the following materials should he use?

• P

• Q

• R

• S

The set-up as shown is used to cast a shadow of an object on the screen. The shadow of the object becomes larger when the ________.

• object is moved nearer to the torch

• screen is moved nearer to the object

• torch is moved further from the screen

The diagram shows how water changes from one state to another. Which of the following best identifies A, B, C and D?

• State A: Liquid, State B: Gas, Heat gain/loss at C: loss, Process D: Evaporation

• State A: Liquid, State B: Gas, Heat gain/loss at C: gain, Process D: Boiling

• State A: Gas, State B: Liquid, Heat gain/loss at C: loss, Process D: Boiling

• State A: Gas, State B: Liquid, Heat gain/loss at C: gain, Process D: Evaporation

Dan wanted to find out how the temperature of water in a container affects the rate of evaporation of water. He prepared four set-ups with different variables as shown: Set-up | A | B | C | D Exposed surface area of container (cm²): 150 | 80 | 150 | 150 Volume of water in the container at the start (cm³): 500 | 450 | 500 | 450 Temperature of water (°C): 95 | 30 | 30 | 95 Which two set-ups did Dan use for his investigation?

• (1) A and B

• (2) A and C

• (3) B and C

• (4) B and D

Which of the following are correct examples of processes A and B?

• (1) Process A: Water droplets forming on a glass of cold water. / Process B: Heating water at 100°C.

• (2) Process A: Mist forming at the spout of a kettle of boiling water. / Process B: Water droplets forming on the surface of a leaf in the morning.

• (3) Process A: Spectacle lenses becoming foggy after leaving an air-conditioned room. / Process B: Decrease in the volume of water in a cup after it is left on the table.

• (4) Process A: Water droplets disappearing from the surface of a glass filled with cold water. / Process B: Water droplets forming on a glass of cold water.