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HOME WORK -Science– CALSS 7-A ,B,C.
Q.1: Fill in the blanks :
1) When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.
2) The rotting dead matter in the soil is called ________.
3) The number of times a person breathes in a minute is termed as the ________.
4) The blood from the heart is transported to all parts of the body by the__________.
5) The muscular floor of chest cavity is ________.
Q.2: Choose the correct answer:
1) In plants, water is transported through ________
a) Xylem
b) Phloem
c) Stomata
d) root hair
2) The water holding capacity is the highest in
a) Clayey soil
b) Sandy soil
c) Loamy soil
d) Mixture of sand and loam
3) In cockroaches air enters the body through
a) Lungs
b) Spiracles c) Gills d) Skin
4) By which process, plant loose water in the form of water vapors through stomata?
a) Transpiration
b) Transportation
c) Evaporation
d) Translocation
5) During heavy exercise, we get cramps in the legs due to the accumulation of
a) Carbon dioxide
b) alcohol
c) water
d) lactic acid
Q.3: Answer in one sentence
1) Give two examples of physical change.
2) How can you prevent soil erosion?
3) Name the blood vessels of our body?
4) What are the effects of smoking on health?
5) Why do we respire?
Q.4: Answer in short
1) Write the difference between physical and chemical changes?
2) Write down the equation of respiration?
3) Write down the ways to prevent iron from rusting?
4) What is soil? Draw a diagram of soil profile?
Q.5: Answer in brief
1) What is respiration? Name the respiratory organ of the following organisms –
i) Fish ii) Earthworm
iii) cockroach
iv) Birds
2) Write down uses of soil?
3) What is crystallization? Describe how crystals of copper sulphate are prepared.?
4) What are stomata? Write its function?
Q.6: Answer in detail:
1) Draw and label human excretory system?
2) What is excretion?
3) Why is it necessary to excrete waste product?
Hmoe work -2
50 –MCQ”S ( From 5 chapters )