Source of energy for animals
Food gives us energy.
Various activities Life processes
• The food that we eat cannot provide our bodies with energy immediately.
• It has to be digested first.
• Glucose is the digested form of food that provides us energy.

Source of energy for animals
• We depend on animals and plants for food.
• All animals depend on plants directly or indirectly to obtain the energy they need.

Questions…
If all animals depend on plants for food directly or indirectly, how do plants obtain food?
We eat food for energy. Do plants need energy like us? How do they get this energy?

Do plants need energy?
• Plants also need energy to carry out life processes for it to stay alive.
How do they get this energy?

How do plants get its energy?
water
Chlorophyll

How do plants get its energy?
Sugar

• The sun is a source of energy.
• Plants are directly dependent on the Sun as a source of energy.
• Animals are indirectly dependent on the Sun as a source of energy.

Photosynthesis:

Question:
Which of the following statements about energy are true?
(A) Cows get their energy from the grass that they eat.
(B) Plants get their energy from the soil that they grow in.
(C) Humans get their energy from the food that they eat.
(D) Birds get their energy from the wind when they fly.
(1) A and B only
(2) A and C only
(3) B, C and D only
(4) A, C and D

Question:
In the diagram above, the arrows labeled A and B should be
_____________.
(1) A: carbon dioxide
(2) A: carbon dioxide
(3) A: oxygen
(4) A: oxygen
B: oxygen
B: carbon dioxide
B: carbon dioxide
B: oxygen

Question:
The upper side of green leaves is usually darker because it contains more __________ .
(1) stomata to absorb more oxygen
(2) stomata to trap energy to make food
(3) chlorophyll to trap energy to make food
(4) chlorophyll to maintain the temperature of the plant

Question:
Which of the following statements about energy is correct?
(1) Plants get energy indirectly from the Sun.
(2) Animals get energy directly from the Sun.
(3) Energy from the Sun provides food for green plants.
(4) Energy from the Sun is passed from plants to animals.

Question:

Misconception 1:

Photosynthesis:

How do plants and animals get its energy?

RESPIRATION
Energy production:
Cells make use of
oxygen to break down sugar to release energy,
CO
2 and water.

Photosynthesis
Respiration

Question:
In plants, respiration takes place ___________ .
(1) Only at night
(2) Only in the leaves
(3) Only in the stomata
(4) In all parts of the plants.

RESPIRATION

Question:
Four boys were shown a picture of a dying plant. Each of them made a statement about it.
The plant was not given enough food.
The soil was not suitable for growing plants.
The plant did not get enough sunlight.
The plant did not get enough water

Activity Book
Activity 1.1