Assessments

Answers of the Science Summative Assessment held on 18th August, 2011

**Que. 1) Choose the correct answer: ** (a) Yeast is used in the production of (i) sugar __**(ii) alcohol**__ (iii) hydrochloric acid (iv) oxygen (b) The following is an antibiotic (i) sodium bicarbonate __**(ii) streptomycin**__ (iii) alcohol (iv) yeast (c) Carrier of malaria-causing protozoan is __**(i) female //Anopheles// mosquito**__ (ii) cockroach (iii) housefly (iv) butterfly (d) The most common carrier of communicable diseases is (i) ant **__(ii) housefly__** (iii) dragonfly (iv) spider (e) The bread or //idli// dough rises because of (i) heat (ii) grinding __**(iii) growth of yeast cells**__ (iv) kneading (f) The process of conversion of sugar into alcohol is called (i) nitrogen fixation (ii) moulding __**(iii) fermentation**__ (iv) infection

(g) Which of the following gases is used for providing an inert atmosphere for canned food?

(i) Oxygen (ii) Nitrogen (iii) Hydrogen __**<span style="font-family: 'Times New Roman','serif';">(iv) Carbon dioxide **__ **<span style="color: black; font-family: 'Times New Roman','serif';">Que. 2) True or False: ** <span style="color: black; font-family: 'times new roman','serif';">(i) All fungi and algae are not microscopic; some of them are quite large - **__True__**   <span style="color: black; font-family: 'times new roman','serif';">(ii) Microbes and microorganisms are the same - **__True__**   <span style="color: black; font-family: 'times new roman','serif';">(iii) Most microorganisms live and grow alone and not in colonies - __**False**__   <span style="color: black; font-family: 'times new roman','serif';">(iv)Bacteria are among the smallest and oldest organisms on our planet - **__True__**  <span style="color: black; font-family: 'times new roman','serif';">(v)Viruses are living things - **__False__**

<span style="color: black; font-family: 'times new roman','serif';">(vi) Polio is caused by bacteria - **__False__** <span style="color: black; font-family: 'times new roman','serif';">(vii) Carriers transmit pathogens from an infected person to a healthy person - __**True**__ <span style="color: black; font-family: 'times new roman','serif';">(viii) Fungi and bacteria are responsible for food spoilage - __**True**__ <span style="color: black; font-family: 'times new roman','serif';">(ix) Pasteurization helps in the preservation of milk - **__True__** <span style="color: black; font-family: 'Times New Roman','serif'; font-size: 15px;">(x) Oil and vinegar helps in food preservation -__**T****rue**__ <span style="color: black; font-family: 'Times New Roman','serif'; font-size: 15px;"> <span style="color: black; font-family: 'Times New Roman','serif'; font-size: 15px;"> **<span style="color: black; font-family: 'Times New Roman','serif';">Que. 2) Give the __ONE__ example of the following: ** <span style="color: black; font-family: 'Times New Roman','serif'; font-size: 15px;"> <span style="color: black; font-family: 'times new roman','serif';">(i) Protozoa  <span style="color: black; font-family: 'Times New Roman','serif'; font-size: 15px;">  <span style="color: black; font-family: 'times new roman','serif';">(ii) Fungi  <span style="color: black; font-family: 'Times New Roman','serif'; font-size: 15px;">  <span style="color: black; font-family: 'times new roman','serif';">(iii) Disease caused by bacteria  <span style="color: black; font-family: 'Times New Roman','serif'; font-size: 15px;">  <span style="color: black; font-family: 'times new roman','serif';">(iv) Disease caused by virus   <span style="color: black; font-family: 'times new roman','serif';">(v) Disease caused by protozoa   <span style="color: black; font-family: 'times new roman','serif';">(vi) The habitat of microorganisms <span style="color: black; font-family: 'times new roman','serif';">(vii) A communicable disease <span style="color: black; font-family: 'times new roman','serif';">(viii) Mode of transmission of communicable disease <span style="color: black; font-family: 'Times New Roman','serif'; font-size: 15px;">(ix) A plant disease caused by pathogens

**<span style="color: black; font-family: 'Times New Roman','serif';">Que. 3) Answer the following: **

<span style="color: black; font-family: 'times new roman','serif';">(i) The major groups of microorganisms

<span style="color: black; font-family: 'times new roman','serif';">(ii) The bacteria which is responsible for the curding of milk

<span style="color: black; font-family: 'times new roman','serif';">(iii) The bacteria which is used to produce alcohol

<span style="color: black; font-family: 'times new roman','serif';">(iv) The microorganism which causes measles

<span style="color: black; font-family: 'times new roman','serif';">(v) The microorganism which causes chicken pox

<span style="color: black; font-family: 'times new roman','serif';">(vi) An animal disease caused by pathogens

<span style="color: black; font-family: 'times new roman','serif';">(vii) A plant disease caused by pathogens

<span style="color: black; font-family: 'times new roman','serif';">(viii) An insect which is a common carrier of microbial diseases

<span style="color: black; font-family: 'times new roman','serif';">(ix) A microorganism which is not affected by antibiotics

<span style="color: black; font-family: 'times new roman','serif';">(x) The process of conversion of a sugar into an acid or alcohol by the action on microorganisms **<span style="color: black; font-family: 'times new roman','serif';">Que. 4) **<span style="color: black; font-family: 'Times New Roman','serif';">What do you understand by microorganisms?  **<span style="color: black; font-family: 'times new roman','serif';">Que. 5) **<span style="color: black; font-family: 'Times New Roman','serif';">Write the main conditions required for the growth of microorganisms. **<span style="color: black; font-family: 'times new roman','serif';">Que. 6) **<span style="color: black; font-family: 'Times New Roman','serif';">Write any five useful effects of microorganisms.  **<span style="color: black; font-family: 'times new roman','serif';">Que. 7) **<span style="color: black; font-family: 'Times New Roman','serif';">Write any five harmful effects of microorganisms. **<span style="color: black; font-family: 'times new roman','serif';">Que. 8) **<span style="color: black; font-family: 'Times New Roman','serif';">Name different types of bacteria according to their shapes with proper diagram.  **<span style="color: black; font-family: 'times new roman','serif';">Que. 9) **<span style="color: black; font-family: 'Times New Roman','serif';">Why does curd turn sour more easily in summer than in winter? **<span style="color: black; font-family: 'times new roman','serif';">Que. 4) **<span style="color: black; font-family: 'Times New Roman','serif';">What are antibiotics? What precautions must be taken while taking antibiotics?  **<span style="color: black; font-family: 'times new roman','serif';">Que. 5) **<span style="color: black; font-family: 'Times New Roman','serif';">What is ‘Vaccination’? Name certain diseases which can be prevented by vaccination? **<span style="color: black; font-family: 'times new roman','serif';">Que. 6) **<span style="color: black; font-family: 'Times New Roman','serif';">What is ‘Pasteurization’? Who discovered this process?  **<span style="color: black; font-family: 'times new roman','serif';">Que. 7) **<span style="color: black; font-family: 'Times New Roman','serif';">What are ‘Pathogens’? Give examples. **<span style="color: black; font-family: 'times new roman','serif';">Que. 8) **<span style="color: black; font-family: 'Times New Roman','serif';">What are communicable diseases? Give examples.  **<span style="color: black; font-family: 'times new roman','serif';">Que. 9) **<span style="color: black; font-family: 'Times New Roman','serif';">What are preservatives? Write the common methods of food preservation. <span style="color: black; font-family: 'Times New Roman','serif'; font-size: 15px;">**Que. 10)** Draw a neat labeled diagram of a ‘Microscope’

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