1) What will happen ifa) The plant leaves are devoid of stomata?
b) All the plants perish from the Earth.
2) How can you say photosynthesis maintain a balance between Oxygen and Carbon
dioxide in the atmosphere?
3) How is ruminant's stomach different from human stomach?
4) Which structure in Amoeba can be compared to the mouth of humans?
5) Animal activists are against the silk production. Why?
6) Why is water not used instead of mercury in thermometer when it is easily available to
us?
7) A person has a white and black shirt which shirt will make him more comfortable in
(a)winters, (b) summers? Give reasons for your answer.
8) Why do mud houses with thached roofs keep cool in summers and warm in winters?
9) How acids are helpful in maintaining our good health?
10) Why is making of tubewells prohibited in residential areas?
11) Why is distribution of water uneven in our country?
12) Explain, How deforestation can lead to depletion of groundwater?
Note: a) make a separate and slim notebook for the vacation work of science.
b) Write all the keywords or tough words (5 times each) in the same notebook.
c) Learn and prepare all the chapters for half yearly examination.
Answers
Answer:
a) plant is not survive
B) No
c) yes
d) no
e) yeak is production doll
f) yes
g) black winter and white summer
h)brcouse envarment is cool in winter and hot in summer
I) no
j) because all people waste water
k) b) is right answer
Answer:
a) If the plants leaves loss its stomata the air and sunlight wouldn't be able to reach inside of the leaves and though it will not be able to make its food...
b) If plants perish from the earth , we will also get vanished as no one can live without oxygen and that oxygen named thing we get from plants.
3) Yes photosynthesis maintains a balance between oxygen and carbon dyoxide as plants take carbon dioxide and gives oxygen in thiscway the medium between them is balanced.
4) Ruminants stomach differentiats from human stomach as ruminants have four chambers while human have only one.