Question

cause spoilage of food and
Exercises
(vii)
Snake bites
Nut:
Foc
(viii) ____
CO
(ix)
(i) Botulism
(ii) Bioweapons
12.1
N
All livit
shapes
They
remo
cycle.
of such animal is talks
and on chilling, it clears as straw colour
by producing anti-venom from the
5. Explain the following terms:
6. Explain briefly the role of bacteria in the
7. List three harmful effects of bacteria.
(ii) Why is it dangerous to use contaminated To
(ii) agriculture (i indus.
10. List three harmful effects of fungi.
11. Name two diseases caused in plants by tung
13. Describe the role of bacteria and fungi in rear
14. Describe three common methods of preserva
15. Name three chemicals used as food preservative
Fungi
1. Give one word for each of the following:
(i) Association of fungi with roots of plants.
(ii) Conversion of ammonium compound with
nitrates by bacteria.
2. Find the odd one out, and give reason in support
of your answer :
(i) Formation of curd, leather industry, mushroom
cultivation.
(ii) Baking of bread, mycorrhiza, formation of curd.
3. Define the following terms :
(i) Nitrogen fixation (ii) Nitrification
8. (i) List four uses of bacteria.
(iii) Mycorrhiza
(iv) Biodeterioration
(v) Spawning
(vi) Denitrification
9. Describe the role of bacteria in :
4. Complete the following paragraph by filling in the
(i) medicine
blanks (i) to (ix) with appropriate words :
Serums contain (0)
substance of a
particular (ii)
and they are used
as preventive measure against (iii)
12. List four uses of fungi.
invasions. To prepare serum, a small quantity of
bacterial (iv)
of materials.
is injected into a healthy
The animal body produces
to neutralise the effect of toxin.
of food.
This process is repeated for several rounds and
to th
kind
they
To
rea
)
en
T
с
(vi)​

Answer 1

10. FOOD SPOILAGE

     PLANT DISEASES

     HUMAN DISEASES

I UNDERSTOOD ONLY SOME OF YOUR QUESTIONS BUT I CANNOT ANSWER THEM AND BY THE WAY DO NOT ASK SO MANY QUESTIONS AT A TIME, ASK ONE BY ONE.