Structure and Characteristics of Algae

Q. Which among the following are algae?

1. Spirulina
2. Oedogonium
3. Ceratium
4. Daphnia

Q.

What is the antibiotic resistance gene?

Q.

Are all protists photosynthetic?

Q. Female $Anopheles$ mosquito: 'X' :: Female $Aedes$ mosquito : 'Y'.

Identify the diseases 'X' and 'Y'.

1. X - Dengue, Y - Measles
2. X - Malaria, Y - Polio
3. X - Malaria, Y - Dengue
4. X - Typhoid, Y - Chicken pox

Q. Which among the following organisms is an algae?

1. Amoeba
2. Paramecium
3. Plasmodium
4. Vorticella

Q.

Why antibiotics have no effect on viruses?

Q. Rhizobium helps in atmospheric _________ fixation.[0.5 marks]

A) oxygen
B) water
C) nitrogen
D) carbon dioxide

Q. Miss, is Anabaena name of (cyanobacteria) blue -green algae only ??

Q. What are communicable diseases? Briefly explain their modes of transmission.​

Q.

Name the microbe against which antibiotics are nearly ineffective.

Q. Sam's mother was undergoing treatment for severe cold and bacterial infection. He had lunch with his mother and used her hand towel for wiping off his hands. When he returned home, he found himself suffering from the same disease. What could be the possible reason of his sudden infection and what was the type of diseases he got infected with?

1. Transfer of pathogens through hand towel, Communicable disease.
2. Transfer of pathogens through hand towel, Non-communicable disease.
3. Transfer of pathogens through genes, Non-communicable disease.
4. Transfer of pathogens through genes, Communicable disease.

Q. This section contains 1 Assertion-Reason type question, which has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (a), (b), (c) तथा (d) दिये गये हैं, जिनमें से केवल एक सही है।

A : If a person is having common cold, then it can be cured by taking antibiotics.
A : यदि एक व्यक्ति खाँसी-जुकाम से ग्रसित है, तो इसे एंटीबायोटिक लेकर ठीक किया जा सकता है।

R : In bacterial infection, taking antibiotics reduces the severity or the duration of the disease.
R : बैक्टीरिया संक्रमण में, एंटीबायोटिक लेने से रोग की तीव्रता अथवा उसकी समय अवधि कम होती है।

1. Both (A) and (R) are true and (R) is the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं लेकिन (R), (A) का सही स्पष्टीकरण नहीं है
3. (A) is true but (R) is false
   
   (A) सही है लेकिन (R) गलत है
4. (A) is false but (R) is true
   
   (A) गलत है लेकिन (R) सही है

Q. Identify the given images and give the most appropriate title.

1. 
2. 
3. 
4. 

Q.

Which of the following is correct about microorganisms?

i. Microorganisms are used as food preservatives.
ii. Microorganisms increase soil fertility.
iii. Microorganisms are used to make antibiotics.
iv. Some Microorganisms clean the environment.

1. (i) and (iii)

2. (ii), (iii) and (iv)

3. (ii) and (iii)

4. (i) and (iv)

Q.

Can viruses be killed by antibiotics?

Q. Algae are eukaryotic.

1. False
2. True

Q. Algae can be found in fresh water.

1. False
2. True

Q. Spirogyra is an example of a/an ______ .

1. algae
2. fungi
3. virus
4. protozoa

Q.

Which of the following is Chlamydomonas?

1. 

2. 

3. 

4. 

Q. are produced by the immune system to fight against pathogens.

1. Antigens
2. Antidotes
3. Antibodies

Q. Study the classification chart carefully and fill in the blanks with the correct words.
Figure

Q. During the process of bread making, dough rises up due to the formation of ___.

1. carbon monoxide
2. nitrous oxide
3. carbon dioxide
4. calcium hydroxide

Q. Sam's mother was undergoing treatment for severe cold and bacterial infection. He had lunch with his mother and used her hand towel for wiping off his hands. When he returned home, he found himself suffering from the same disease. What could be the possible reason of his sudden infection and what was the type of diseases he got infected with?

1. Transfer of pathogens through hand towel, Non-communicable disease.
2. Transfer of pathogens through genes, Non-communicable disease.
3. Transfer of pathogens through genes, Communicable disease.
4. Transfer of pathogens through hand towel, Communicable disease.