Page 88 - CT&AI_CLasa_7_Part_1

If X stops functioning properly, which process • Plant B is kept in complete darkness and
will be affected? (Pattern Recognition) appears pale yellow

(a) Transport of food What is the most appropriate explanation
for the difference in colour between the two
(b) Gas exchange and transpiration plants? (Pattern Recognition)

(c) Root growth (a) The plant in darkness produces
more chlorophyll.
(d) Seed germination

10. Two identical plants are kept under different (b) Lack of sunlight prevents chlorophyll
conditions as shown: formation in plant B.
• Plant A is kept (c) The plant in sunlight loses its
in sunlight pigments.
and appears
green (d) Darkness increases photosynthesis.

Plant A Plant B

A student sets up two similar experiments to test the release of carbon dioxide:
Set-up A: Flask contains germinating seeds connected to lime water
Set-up B: Flask contains dry seeds connected to lime water

Tube A Tube A
Lime water Lime water

Tube B Tube B
Germinating Dry
seeds seeds
Set-up A Set-up B
Observation: The lime water in set-up A turns milky, while in set-up B it remains
clear.
What is the best explanation for the difference in observations between the two
setups?

(a) Germinating seeds release oxygen, while dry seeds release carbon
dioxide.

(b) Dry seeds do not respire, while germinating seeds respire actively and
release carbon dioxide.
(c) Lime water reacts only with dry seeds.

(d) Dry seeds absorb carbon dioxide from lime water.

86 Computational Thinking-7 (Science)