What Are Methanogens

Q. Which of the following statements about methanogens is not correct?

1. They can be used to produce biogas
2. They are found in the rumen of cattle and their excreta
3. They grow aerobically and breakdown cellulose-rich food
4. They produce methane gas

Q. Cow dung and water is mixed and this slurry is fed into the biogas plant for digestion by microbes. The person performing the process shares that there is no need to provide inoculum for it, why? What is the role of microbes at the source? Under which condition will they be most active and effective? [3]

Q. Group of bacteria used in biogas production is

1. Eubacteria
2. Methanotrophs
3. Organotrophs
4. Methanogens

Q. Methanogens, growing anaerobically on cellulosic material, produce

1. methane
2. methane and carbon dioxide
3. methane and hydrogen
4. methane, carbon dioxide and hydrogen

Q. Biogas production from waste biomass with the help of methanogenic bacteria is

1. One step process
2. Two step process
3. Three step process
4. Multistep process

Q. Fucus, the brown alga has a diplontic life cycle.

1. True
2. False

Q. Read the following statements (A - D) and select the true (T) and false (F) ones regarding physiological barriers.

A.Lysozyme present in saliva and tears kills viruses by destroying their cell walls.
B.Acid in the stomach destroys bacteria.
C.A rise in body temperature is a natural defence mechanism to destroy pathogens.
D.The sweat and oil secreted make the skin surface alkaline.

1. A - F, B - T, C - T and D - F
2. A - F, B - T, C - T and D - T
3. A - F, B - T, C - F and D - F
4. A - T, B - T, C - T and D - F

Q. The ruminant stomach has four parts ; but camel lacks one part i.e., .............

1. Abomasum
2. Omasum
3. Rumen
4. Reticulum

Q.

Most living organisms cannot survive at temperature above 45°C°. How are some microbes able to live in habitats with temperatures exceeding 100°C?

Q. Assertion :Methanogens are present in the gut of several ruminant animals. Reason: Methanogens help in the production of methane from dung of ruminants.

1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true but reason is not the correct explanation of assertion.
3. If assertion is true but reason is false.
4. If both assertion and reason are false.

Q. Which of the following statements about methanogens is not correct?

1. They can be used to produce biogas
2. They are found in the rumen of cattle and their excreta
3. They grow aerobically and breakdown cellulose-rich food
4. They produce methane gas

Q.

Organisms called Methanogens are most abundant in a:

1. Polluted stream

2. Hot spring

3. Cattleyard

4. Sulphur rock

Q. What are methanogens? Name the animals they are present in and the role they play there.

Q. The true stomach in cows is called as

1. Abomasum
2. Rumen
3. Lumen
4. None of the above

Q. The number of chambers in the stomach of ruminants is

1. 3
2. 2
3. 4
4. 1

Q. Methanogens, growing anaerobically on cellulosic material, produce

1. methane
2. methane and carbon dioxide
3. methane and hydrogen
4. methane, carbon dioxide and hydrogen

Q. The stomach of ruminants is mainly divided into four parts, but in camel which one part is missing?

1. Rumen
2. Abomasum
3. Omasum
4. Recticulum

Q. Process of biogas production is:

1. Passive process
2. Active process
3. Aerobic process
4. Anaerobic process

Q. Biogas produced through anaerobic fermentation of organic material is primarily

1. $C{H}_3$
2. $O_2$
3. $C{H}_4$
4. $CO$

Q. Which is correctly paired?

1. Aspergillus niger - Production of lactic acid
2. Trichoderma polysporum - Lowers blood cholesterol
3. Saccharomyces cerevisiae - Production of citric acid
4. Methanogenic bacteria - Gobar gas formation

Q. Biogas produced by anaerobic fermentation of water biomass consists of

1. $C{O}_2$
2. Methane
3. Traces of $H_2,H_{2}Sand{N}_2$
4. All of the above

Q. Which of the following bacteria is utilized in gobar gas plant?

1. Ammonifying bacteria
2. Methanogens
3. Nitrifying bacteria
4. Denitrifying bacteria

Q. Methanogens, growing anaerobically on cellulosic material produce.

1. Methane and carbon dioxide
2. Methane
3. Methane and hydrqgen
4. Methane, carbon dioxide and hydrogen

Q. Which one is used in biogas generation?

1. Methanobacterium
2. Rhizobium
3. Agrobacterium
4. Azotobacter

Q. Methanogens belong to

1. Slime moulds
2. Eubacteria
3. Archaebacteria
4. Dinoflagellates

Q. Last step in biogas production is carried out by

1. Fermentative microbes
2. Decomposer microbes
3. Methanogens
4. Thermoacidophiles

Q. Group of bacteria used in biogas production is

1. Eubacteria
2. Organotrophs
3. Methanotrophs
4. Methanogens

Q.

1. Anabolism
2. Respiration
3. Both A and B
4. None of the above