Question

1. Plasmodium is a ___________ which causes ____________ in humans.

2. _____________ changes nitrogen of air into ammonia.

3. A drug that kills bacteria._______________

Level 2

4. Why viruses lie in the borderline of living and non-living? 5. Streptococcus, Lactobacillus, Vibrio Cholerae

How are these microorganisms a) similar and b) different? 6. Find the odd one out and give a reason for your choice. a) amoeba, volvox, paramoecium, euglena

b) i. Mushrooms are eaten as food.

ii. Used in fermentation of alcohol

iii. Grows on leather footwear.

7. Why does milk take longer time to form curd in winter than in summer? 8. Why should buildings be painted before rainy season?

Level 3

9. Microorganisms are found in the intestine of certain animals.

Name the microorganisms. _________________

Which component of food is digested by them? ________________

10. We make pickles at home. Do we use any natural preservative in it? ______ Which are the preservatives used? ___________________________________ 11. Why do AIDS patients have low immunity?

12. My mother forgot to keep the extra idli dough in the refrigerator after use on a summer day. At noon she found that the dough was overflowing and had become very sour. How did this happen?

Answer 1

1. parasite - infections in red blood cells

2. The Haber process

3. Antibiotic

4. They do not share all characteristics of living things, however they have a genetic material.

5.

6)

a> Amoeba. A pseudopod that has no definite shape.

b> iii. Grows on leather footwear.