Secondary sewage treatment is mainly a

(1) mechanical process

(2) chemical process

(3) biological process

(4) physical process

The most common substrate used in distilleries for the production of ethanol is

(1) soya meal

(2) ground gram

(3) molasses

(4) corn meal

Select the correct statement from the following

(1) Biogas is produced by the activity of aerobic bacteria on animal waste

(2) Methanobacterium is an aerobic bacterium found in rumen of cattle.

(3) Biogas, commonly called gobar gas, is pure methane

(4) Activated sludge-sediment in settlement tanks of sewage treatment plant is a right source of aerobic bacteria

A common biocontrol agent for the control of plant disease is 

(1) Baculovirus

(2) Bacillus thuringiensis

(3) Glomus

(d) Trichoderma

Which one of the following is not used in organic farming?

(1) Glomus

(2) Earthworm

(3) Oscillatoria

(4) Snail

Which of the following plant species you would select for the production of bioethanol?

(1) Brassica

(2) Zea mays

(3) Pongamia

(4) Jatropha

Probiotics are:

(1) safe antibiotics

(2) cancer induding microbes

(3) new kind of food allergens

(4) live microbial food supplement

Which one of the following helps in absorption of phosphorus from soil by plants?

1. Rhizobium

2. Anabaena

3. Frankia

4. Glomus

Yeast is used in the production of

(1) citric acid and lactic acid

(2) lipase and pectinase

(3) bread and beer

(4) cheese and butter

Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition?

(1) Azotobacter

(2) Aspergillus

(3) Glomus

(4) Trichoderma