13
The importance of photosynthesis
Every animal, including humans, needs oxygen to live. Plants give us oxygen. Plants absorb nutrients and
water from the soil and carbon dioxide from the air during the day and use these to make their own food.
In this process they release oxygen into the air for us to breathe.
2
Listen and repeat.
Listen again and count the syllables.
3
In your notebook, copy the true sentences and correct the false ones.
a)
In sexual reproduction, pollen is produced by the pistil and carried to the stamen.
b)
Pollination is helped by animals, especially insects, and by the wind.
c)
In asexual reproduction, the plant does not have a male and a female reproductive organ.
d)
In sunlight plants give off carbon dioxide into the air as part of the process of photosynthesis.
4
Observe the oxygen!
5
Q
U
Z
I
Check your learning.
A C T I V I T I E S
12
13
14
You need:
- a bowl
- water
- leaves
1.
Put a leaf in water in a sunny place. Check after an hour.
2.
What are the little bubbles on the leaf (especially on
the underside) and on the sides of the glass?
3.
Now put one leaf in water in a sunny place and one
leaf in water in a dark place. Is there any difference?
sexual reproduction wind pollination self-pollination buds
tubers runners asexual reproduction photosynthesis
Thank you plants!
