GRADE: 4
20/04/2023
SUBJECT: SCIENCE
LESSON 1: PLANTS- THE FOOD FACTORIES
I.
DEFINE THE FOLLOWING:
1. Photosynthesis: The process by which plants make their own food by
using sunlight, water and carbon dioxide.
2. Stomata: Small opening in the leaves through which plants exchange
gases.
3. Parasitic Plants: Plants that absorb food and water from the plants.
4. Insectivorous Plants: Plants that feed on insects and small animals.
II.
FILL IN THE BLANKS
1. Chlorophyll in the leaves trap energy from sunlight.
2. Plants store extra food in the form of starch in different parts.
3. Leaves make food for the plants.
4. Insectivorous plants grow in poor soil and get nutrients from insects.
III.
NAME THE FOLLOWING
1. Green substance present in the leaves.
ANS: Chlorophyll
2. Gas required by the plants to make food.
ANS: Carbon dioxide
3. Two parts where plants store extra food.
ANS: Stem, Root
4. Two Parasitic plants
ANS: Dodder, Mistletoe
5. Two insectivorous plants
ANS: Sundew, Pitcher plant
6. Gas released by plants during photosynthesis.
ANS: Oxygen
IV.
ANSWER THE FOLLOWING: 1. What does a plant need to carry out photosynthesis?
Ans: A plant needs carbon dioxide, chlorophyll, sunlight, and water to
carry out photosynthesis.
2. What does a plant make during photosynthesis? How are these
products useful to us?
Ans: Plants make food, in the form of sugar, using water and carbon
dioxide by photosynthesis. They also release oxygen during this
process. The sugar is used as food by the plants and the oxygen is used
by animals for respiration.
3. Briefly explain the process of photosynthesis.
Ans: Plants make their own food by the process of photosynthesis.
i)
ii)
iii)
iv)
v)
The chlorophyll present in the leaves traps the energy from the
sunlight.
The leaves take in carbon dioxide through stomata.
The roots take in water from the soil.
Carbon dioxide and water are put together to form sugar.
Oxygen is released and send out through stomata.
4. What can we do to increase the amount of oxygen in air?
Ans: To increase the amount of oxygen in air, we have to plant trees in
our surroundings.
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