Which of the following cannot multiply outside
the living cells:
[2013-14]
(a) Bacteria
(b) Protozoa
(c) Viruses
(d) Fungi
11d Suicide
Answers
Answer: c) Viruses
Explanation: Viruses are in an Inactive state outside the living cell, it attaches to the living cell in order to multiply in number by hijacking the Genetic material of host cell.
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Q1. Answer in one word.
1. Name two typical habitats of micro-organisms
Answer: Commonly found everywhere – in air, in water, inside the bodies of living organisms.
2. Name a disease caused by bacteria
Answer: Tuberculosis, Pneumonia
3. Name the microorganism that is used for obtaining alcohol from sugar.
Answer: Yeast.
4. Name one carrier of disease – causing microorganisms.
Answer: House Fly which causes many diseases like cholera, typhoid, diarrhoea.
5. Where do the external parasites of animals live?
Answer: External parasites like lice, flies, ticks, grubs etc. live on the skins of the animals.
Q2. Short- Answer Questions (10-15 words)
1. Name the four major groups of microorganisms.
Answer:
Bacteria: Baccili, Cooci
Fungi: Prencillium, Bread Mould
Algae: Chlamydomonas, Nostoc
Protozoa: Amoeba, Paramecium
2. How do the blue –green algae and symbiotic bacteria convert atmospheric nitrogen into nitrogen compounds?
Answer: Rizobium bacteria con take atmospheric nitrogen and convert it into nitrates soluble in soil.
3. Name the modes of transmission of communicable disease.
Answer:
Direct Transmission: By direct contact, By droplet infection, sharing infected needles, syringes and razors, infected blood transfusion.
Indirect Transmission: Infected food, water or air, Through carriers like house fly, mosquitoes, rats etc., Through dirty hands.
4. What are the symptoms of food poisoning?
Answer: Headache, Fever, Vomiting, Diarrhoea