Unit Test – 2 - 7th General Science (Semi)
Q. A. Fill in the blanks
with proper words from bracket -5
(plastids, stomach, fertilizers,
involuntary, oesophagus, voluntary, mouth)
1. Pushing forward the
food that has been chewed is the function of the oesophagus.
2. Eyelids have voluntary muscles.
3. Garbage is Converted
into fertilizers by
microorganisms.
4. The process of
digestion starts from mouth.
5. The organelle Called
the plastids is present in plant cells only.
B. match the following. -3
A Group (Answers) 'B' Group
1. Cramps ( e
) a. Chewing of movements of jaws
2. Are brought about by
muscles ( d ) b. We never
feel tired
3. skeletal muscles. ( a ) c. Enzymes of gastric
juice
4 Cardial muscles ( b )
d. Always functions in pairs
5. pepsin ( c ) e. Uncontrolled & and painful contraction
of muscles
C. Write right or wrong. -2
1. Tongue test- buds can
tell only a sweet taste. ( Wrong )
2. Lung play an important
role in excretion. ( Wrong )
Q. 2. A. Classify the
following changes. -3
1. Stretching of a Spring –
Physical, reversible.
2. Occurrence of an earthquake
– Physical, chemical, irreversible, natural.
B. Give reasons. -2
1. Intoxicating Substances
should not be consumed.
Answer –
Consuming intoxicating addictive substances can
cause harm to our health. Tobacco, smoking, cigarettes, consuming alcohol are
bad addictive habits. Some of these are also cause cancer of various organs and
disturb functioning of body. Therefore, intoxicating Substances should not be consumed.
2. An iron article should be
given a coat of paint.
Answer - An iron article rusts naturally which is called
corrosion. Corrosion takes place due to oxygen, moisture, vapours of chemicals
in the air. Corrosion makes articles weak and unusable. Therefore, to prevent iron
articles from contact of air, moisture and other chemicals and keep in good
condition, it should be given a coat of paint.
C. Answer the following
questions. -3
1. How are the cells
protected?
Answer-
The plasma membrane does not allow the unwanted
cells to enter in the cells. The cell wall of the plant cell also protects the
cells. Some protective proteins acts against the harmful microbes. In this way
the cells are protected.
2. which are the different types
of micro-organisms.
Answer-
Bacteria, virus, fungi, algae and protozoan are the
different types of micro-organisms.
3. Name the different types of
teeth.
Answer-
There are main four types of teeth. These are
incisors, canines, premolars and molars.
