Primary 3 and Primary 4

Must-Know Exam Questions on Plants

This science revision note aims to help your child get the proper answering technique for energy conversion.

 

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MUST-KNOW about plants:

1. Identify the different groups of plants.

    • Flowering vs non-flower plants
    • Reproduction by spores vs reproduction by seeds

2. Recognise the characteristics and functions of each plant part.

Key parts of the plants and their functions:

  • Roots: absorb water and mineral salts for the plant
  • Stem: provide support for the plant
  • Leaf: Absorbs light to make food for the plant. Presence of stomata (tiny openings found mainly on the underside of the leaves) that helps with gaseous exchange.

 

Question

The diagram below shows some moss growing on a rock.

Explain how the moss obtains food.

 

STEP 1

Identify which group of living things the moss falls into.

Moss is a non-flowering plant.

 

STEP 2

Identify the characteristics of the moss.

Link to how the moss obtain food.

Moss traps/absorbs light to make food.

 

FINALLY, put your answer together

Question: Explain how the moss obtains food.

Answer:

The moss is a non-flowering plant. Moss traps/absorbs light to make food.

 

 

Common mistakes

 

Wrong answer: The moss breaks down the rock and feeds on the rock.

Teachers’ comments: The moss is a plant and not a decomposer!

 

Wrong answer (Only for P5 and P6 students): The moss is a non-flowering plant. Moss traps/absorbs light to make food.

Teachers’ comments: In P5, you should have learnt the cell parts and their functions. In P6, you should have learnt the process of photosynthesis.

Hence, your answers must include more science concepts (photosynthesis and chloroplasts).

 

Correct answer: The moss is a non-flowering plant. Moss contains chloroplasts. The chloroplasts enable the moss to trap/ absorb light and make food through photosynthesis.

 

Read these revision notes for more details (these notes are for P5 and P6 students)

>> https://scienceshifu.com/energy-from-food-topic-explain-how-light-affects-photosynthesis/

 

Let’s try out this question

The diagram below shows a growing plant.

When part A of the plant is removed, the plant dies a few days later. Explain why.

 

STEP 1

Identify part A – roots

 

STEP 2

Link the role of the Part A to the plants’ survivalRoots absorb water and mineral salts for the plant.

 

 

FINALLY, put your answer together

Question: When part A of the plant is removed, the plant dies a few days later. Explain why.

Answer:

Part A is the roots. The roots help the plant to absorb water. Water is needed for the plant to survive.

 

Common mistakes

 

Wrong answer (Only for P5 and P6 students): Part A is the roots. The roots help the plant to absorb water. Water is needed for the plant to survive.

Teachers’ comments:

P5 and P6 students, you should have known this – Roots help the plant to absorb water and mineral salts from the soil for photosynthesis.

Hence, your answers must include the scientific concept of photosynthesis.

 

Correct answer for P5 and P6 students: Part A is the roots. The roots help the plant to absorb water. Water is needed by the plants for photosynthesis to make food.

 

Read these revision notes for more details (these notes are for P5 and P6 students)

>> https://scienceshifu.com/energy-from-food-topic-explain-how-light-affects-photosynthesis/

 

Let’s try another question! This question is suitable for P4, P5 and P6 students.

The diagram below shows a magnified view of the leaf.

Identify the tiny openings and provide two functions of the tiny openings.

 

STEP 1

Identify the tiny openings – Stomata

 

STEP 2

Link the role of the tiny openings to the plants’ survival.

Stomata help in gaseous exchange between the plants and the surroundings.

 

Don’t just stop there! You have to be more specific!

How exactly does the stomata help in the plants’ survival?

There are 3 must-know functions:

  • Stomata enables photosynthesis to take place by taking in carbon dioxide and giving out oxygen.
  • Stomata lose water vapour to keep the plants cool on a hot day.
  • Stomata take in oxygen gas to allow the plant to respire. Carbon dioxide gas then leaves the stomata.

 

Note: Living things undergo respiration by taking in oxygen and giving out carbon dioxide gas. Energy is released during respiration. Energy enables us to do work.

 

FINALLY, put your answer together

Question: Identify the tiny openings and provide two functions of the tiny openings.

Answer:

The tiny openings are stomata.

The stomata take in carbon dioxide gas for photosynthesis and give out oxygen gas.

The stomata give out water vapour.

Stomata take in oxygen gas to allow the plant to respire. Carbon dioxide gas then leaves the stomata.

(Write out any two functions of the stomata).

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