Question

Exercises
1
Fill in the blanks.
Microorganisms can be seen with the help of a
Blue green algae fix
directly from air and enhance fertility
of soil
fo
Alcohol is produced with the help of
Cholera is caused by
(d)
mentioned
Tick the correct answer
organisms are too small and
de to the unaiced eye.
can live in all kinds of en
ng from fee cold climate to hot
ganisms are found in air Wate
dies of plants and animals
ay be unicellular or multicellulos
anisms include bacterialune
algae. Viruses the
are considered mierobes
are quite different from oth
isms. They reproduce only the
ganism: bacterium plant or an
oorganisms are useful for
production of medicines and
unisms decompose the organe
plants and animals into simple
I clean up the environment
use serious diseases like
misms reside in the root
serts to marshy lands
and some
from the above
alaria.
nisoning
Yeast is used in the production of
(i) sugar (11) alcohol (ui) hydrochloric acid (iv) oxygen
The following is an antibiotic
Sodium bicarbonate (u) Streptomycin (ii) Alcohol (iv) Yeast
Carrier of malaria-causing protozoan is
(1) female Anopheles mosquito (ii) cockroach
(iii) housefly
(iv) butterfly
(d)
The most common carrier of communicable diseases is
organisms grow on our fond
(i) ant (ii) housefly (ii) dragonfly (iv) spider
(e) The bread or idli dough rises because of
(i) heat
(li) grinding (ii) growth of yeast cells (iv) kneading
The process of conversion of sugar into alcohol is called
(i) nitrogen fixation (ii) moulding (iii) fermentation (iv) infection
Match the organisms in Column A with their action in
Column B
3
nous plants. They can
anto soil and increase the
А
B
(i) Bacteria
-nt in the soil fix nitrogen
ere and convert into
(ii) Rhizobium
(ii) Lactobacillus
(iv) Yeast
(a) Fixing nitrogen
(b) Setting of curd
(c) Baking of bread
(d) Causing malaria
lel Causing cholera
(1) Causing AIDS
(g) Producing antibodies
ert compounds of nutro
nto nitrogen gas which
sphere.
(v) A protozoan
(vi) A virus
Con mirroanisms be seen with the naked eveIf not how they be​

Answer 1

Answer:

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