Which one of the following helps in the absorption of phosphorus from soil by plants?   
1. Anabaena
2. Glomus
3. Rhizobium
4. Frankia 

Read the following statement having two blanks (A and B):
“A drug used for _______ (A) ________ patients is obtained from a species of the organism _________ (B) _________.”
The one correct option for the two blanks is:         

Yeast is used in the production of   
1. Bread and beer.
2. Cheese and butter.
3. Citric acid and lactic acid.
4. Lipase and pectinase. 

Read the following four statements (a-d):

How many of the above statements are wrong?

Measuring biochemical oxygen demand (BOD) is a method used for:

Monascus purpureus is a yeast used commercially in the production of 

1. Citric acid
2. Blood cholesterol lowering statins
3. Ethanol
4. Streptokinase for removing clots from the blood vessels.

The domestic sewage in large cities  
1. When treated in STPs does not really require the aeration step as the sewage contains adequate oxygen.
2. Has very high amounts of suspended solids and dissolved salts.
3. Has a high BOD as it contains both aerobic and anaerobic bacteria.
4. Is processed by aerobic and then anaerobic bacteria in the secondary treatment in sewage treatment plants (STPs). 

Besides paddy fields, cyanobacteria are also found inside vegetative part of
1. Pinus
2. Cycas
3. Equisetum
4. Psilotum

A good producer of citric acid is 
1. Aspergillus
2. Pseudomonas
3. Clostridium
4. Saccharomyces 

During sewage treatment, biogases are produced which include :
1. Methane, hydrogen sulphide, carbon dioxide
2. Methane, oxygen, hydrogen sulphide
3. Hydrogen sulphide, methane, sulphur dioxide
4. Hydrogen sulphide, nitrogen, methane