SCIENCE YEAR 4 CHAPTER 4

Plants can response to stimulus such as

• Battery

• Touch and steam

• Air and water

• Woods

Mimosa plant can response to

• Sunlight

• Touch

• Cotton

• Fungus

Plants can produce their own food

• True
• False

Answer explanation

Plants can produce their own food through photosynthesis process

The products of photosynthesis are

• Water, oxygen

• Oxygen

• Oxygen and glucose

• Sunlight and carbon dioxide

Plants shoot and leaves will grow towards the sunlight while plants roots will grow towards the water and gravitational pull

• True
• False

Choose the importance of plants to living organisms

• Plants give carbon dioxide

• Plants can help to cool the earth

• Plants are the source of food for animals and humans

• Some plants can be used as herbs

Salimah waters her hibiscus plant two times a day and place her plant away from sunlight. Is this a proper way to care for plants?

• True
• False

Answer explanation

We should place the plant under or near sunlight source so the plants can grow

Why we should limit deforestation (cut trees to make papers/furniture)

• To preserve the trees

• To avoid global warming

• To increase carbon dioxide

• To make the air quality worse

Answer explanation

Cutting trees can increase the temperature as trees make a cooling effect on earth. Trees also filters the air by absorbing the carbon dioxide.

What is the function of chlorophyll?

• To absorb water

• To absorb sunlight

• To release oxygen

• To absorb the nitrogen

Answer explanation

Chlorophyll is the green-like substance on leaves that are responsible to absorb the sunlight

Starch is the form of food that will be used by plants to grow, and they produce starch (build from glucose) from photosynthesis process

• True
• False

Answer explanation

Plants produce glucose from photosynthesis process and then converted into starch to be stored in plants as food