In the given diagram, the gas X can be:

1.	Hydrogen sulfide	2.	Carbon monoxide
3.	Ammonia	4.	Oxygen

The virus shown here is a causative agent of:

Nitrogen fixation is carried out by:

Which one of the following impurities is easiest to remove from wastewater?

Match the following list of bioactive substances and their roles:
Bioactive Substances: -
(i) Statins (ii) Cyclosporin A (iii) Streptokinase (iv) Lipase

Role-
A. Removal of oil stains
B. Removal of clots from blood vessels
C. Lowering of blood cholesterol
D. Immuno-suppressive agent

Choose the correct match:

1. i B, ii C, iii A, iv D

2. i D, ii B, iii A, iv C

3. i B, ii A, iii D, iv C

4. i C, ii D, iii B, iv A

Match the items in Column ‘A’ and Column ‘B’ and choose correct answer:   

The correct answer is:

1. i B, ii D, iii C, iv A     

2. i C, ii D, iii B, iv A

3. i D, ii A, iii B, iv C         

4. i C, ii D, iii A, iv A

Mycorrhiza does not help the host plant in:

1. Enhancing its phosphorus uptake capacity

2. Increasing its tolerance to drought

3. Enhancing its resistance to root pathogens

4. Increasing its resistance to insects

Biological Pest Control methods are more preferably used because-

1. Chemical pesticides are discriminate

2. Predators work through check and balance

3. Predators are indiscriminate

4. All of above

Which of the following statement is incorrect?

1. Trichoderma is free living fungi, present in root ecosystem acts as biocontrol agent

2. Genus of baculoviruses is species group specific broad spectrum insecticide

3. All harmful insect pests should be kept at manageable level as it furthers biodiversity

4. Ladybird and Dragonflies are used as biocontrol agent

Read the following four statements (I – IV), find out certain mistakes in two of them.
I: In our stomach lactic acid bacteria play beneficial role by checking growth of disease causing microbes.
II: Lactic acid bacteria produce acid that coagulates and completely digests the milk protein.
III: Lactic acid bacteria improve the nutritional quality by increasing the amount of Riboflavin
IV: Lactic acid bacteria require suitable temperature for their multiplication.
Which of the above two statements are not correct?

1. Statements I and II

2. Statement I and III

3. Statement II and III

4. Statements II and IV