Assignment -2
Life processes
Class -10
Biology
1.
What are stomata
and lenticels? Discuss their role in exchange of gases in plants.
2.
How are alveoli
designed to maximize the diffusion of respiratory gases?
3.
A farmer floods
his field every day thinking that watering in this manner will result a better
yield of his wheat crop. What will be the result of this action of the farmer?
4.
Blood plasma is
yellow, then why is blood red in color?
5.
Two green plants are
kept separately in oxygen free containers, one in dark and the other in continuous
light, which one will live longer? Give reasons.
6.
Plants growing in
arid regions have deep roots and sunken stomata. Why?
7.
To demonstrate
the process of transpiration by the bell jar experiment, Vaseline is applied on
the brim of the bell jar? Explain why?
8.
Which organisms
are called natural purifier of air?
9.
Why is
chlorophyll extracted from the leaf before testing it for the presence of
starch?
10.
Stomata of desert
plants remain closed during the daytime. How do they take up carbon dioxide and
perform photosynthesis?
11.
Leaves of a
healthy potted plant were coated with Vaseline to block the stomata. Will this
plant remain healthy for long? State three reasons for your answer.
12.
Why is freshly
prepared lime water used in an experiment to demonstrate evolution of co2 during
respiration?
13.
White blood corpuscles are called ‘soldiers of
the body’. Why?
14.
Lack of oxygen in
muscles often leads to cramps among cricketers. Explain. Why?
15.
In an activity to
demonstrate that ascent of sap takes through xylem tissue, a student’s placed
an uprooted plant in a beaker filled with colored water. After 4-5 hours, he
cut a section of its stem and observed it under a microscope. What will he see
and what can be concluded from that?
16.
What happens to
rate of breathing during vigorous exercise and why?
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