Tag: manure

Questions Related to manure

______ is manufactured artificially in the industrial units by the use of chemicals and are used for commercial purpose.

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. Fertilizer

  2. Compost

  3. Both A and B

  4. None of the above

Show answer
Correct Option: A
Explanation:

A chemical fertilizer/artificial fertilizer is defined as any inorganic material of wholly or partially synthetic origin that is added to soil to sustain plant growth. Organic fertilizers are substances that are derived from the remains or byproducts of natural organisms which contain the essential nutrients for plant growth.

Thus, the correct answer is option A.

The function of leghaemoglobin during biological nitrogen fixation, in root nodules of legumes is to

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. Convert atmospheric N$ _2$ to NH$ _3$

  2. Convert ammonia to nitrite

  3. Transport oxygen for activity of nitrogenase

  4. Protect nitrogenase from oxygen

Show answer
Correct Option: D
Explanation:

Leghaemoglobin is an oxygen scavanger. It combines with oxygen and protects nitrogenase, which catalyses the fixation of nitrogen under anaerobic conditions.

Biofertilizers are preferred over chemical fertilisers because

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. They are cheap

  2. They do not cause pollution

  3. They are harmful

  4. None of the above

Show answer
Correct Option: B
Explanation:
Biofertiliser are preferred over chemical fertilisers because they contain organic materials while fertilisers contain chemical substances that when used in excess become harmful to the consumers. Continuous application of fertilisers to the soil decreases its fertility and also leads to increase in the acidity of the soil. Also the fertiliser runoff from the fields also causes water pollution. Cyanobacteria such as Anabaena and Nostoc also fix atmospheric nitrogen and act as bio-fertilisers especially in paddy fields.
So the correct option is 'They do not cause pollution' .

Biofertilizers are made up by

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. Microorganism

  2. Decomposed materials

  3. Plants

  4. None of the above

Show answer
Correct Option: A

Biofertilizers increase the _________ content of the soil.

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. Nutrient

  2. Humus

  3. Water

  4. None of the above

Show answer
Correct Option: A
Explanation:

Biofertilizer is a substance that contains living organisms which is used to increase the fertility of the soil. It improves the growth of plant by increasing the content of the soil and thereby increasing the availability of nutrients to the host plant. Also, it does not allow pathogens to flourish. Various biofertilizers are Rhizobium, Azotobacter, blue green algae (BGA). They live in symbiotic association with the plants and provides nitrogen to the plant. 

Thus, the correct answer is option A.

Cow dung that is used as a fertilizer can be replaced by 

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. Insecticides.

  2. Pesticides.

  3. Biofertilizers.

  4. None of the above.

Show answer
Correct Option: C
Explanation:

Traditionally, cowdung is used as a fertilizer. It provides growing medium for plants. It is nutrient-rich fertilizer. It is either mixed into the soil or used as top dressing. However, methane (greenhouse gas) is emitted from cowdung when it is processed. Hence, it is replaced by biofertilizers. Biofertilizers are substances which contains live organisms and are used to increase fertilizer of the soil. Examples of biofertilizers include rhizobium, azotobacter, azospirillum and blue green algae(BGA).

Thus, the correct answer is option C.

Which of the following microorganism is used to prepare biofertilizers? 

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. Algae

  2. Protozoa

  3. Virus

  4. None of the above

Show answer
Correct Option: A
Explanation:

Biofertilizer is a substance that contains living organisms which is used to increase the fertility of the soil. It improves the growth of plant by increasing the availability of nutrients to the host plant. Various biofertilizers are Rhizobium, Azotobacter, blue green algae (BGA). Algae have ability of nitrogen fixation, therefore adding organic matter and extra nitrogen to the soil. This increases the soil fertility. 

Thus, the correct answer is option A.

Which of the following is essential for nitrogen fixation in legumes?

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. Anthocyanin

  2. Phycocyanin

  3. Phycoerythrin

  4. Leghaemoglobin

Show answer
Correct Option: D
Explanation:

Leguminous plants are in symbiotic association with nitrogen-fixing bacteria like Rhizobium. These bacteria invade root hairs of leguminous plants and forms root nodules in which they fix nitrogen. A red pigment present in the root nodules of leguminous plants is known as leghaemoglobin. Leghaemoglobin is an oxygen-carrier molecule.  It protects nitrogen-fixing enzyme nitrogenase from the side effect of oxygen as the enzyme is highly sensitive to oxygen.

Thus, the correct answer is 'Leghaemoglobin.'

Which of the following is correct about legumes?

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. They are incapable of fixing nitrogen

  2. They fix nitrogen with the help of bacteria that live in their leaves

  3. They fix nitrogen with the help of bacteria that live in their roots

  4. They fix nitrogen independent of bacteria

Show answer
Correct Option: C
Explanation:

Legumes are in symbiotic association with nitrogen-fixing bacteria like Rhizobium. They fix nitrogen with the help of bacteria that live in their roots. These bacteria invade root hairs of leguminous plants and forms root nodules in which they fix nitrogen. Rood nodules are found in some other plants also apart from leguminous plants. A red pigment present in the root nodules of leguminous plants is known as leghaemoglobin. 

Thus, the correct answer is 'They fix nitrogen with the help of bacteria that live in their roots.'

In root nodules of legumes, the role of leghemoglobin is

evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

  1. To transports oxygen to root nodules

  2. To act as an oxygen scavanger

  3. To act as a catalyst in transamination

  4. To provide energy to nitrogen fixing bacteria

Show answer
Correct Option: B
Explanation:

Atmospheric nitrogen is not available to the plants. Nitrogen fixing bacteria converts atmospheric nitrogen into ammonium compounds and make it available to the plants. There are two types of bacteria, free-living and symbiotic. Example of free living nitrogen fixing bacteria include Azotobacter. The example of symbiotic nitrogen fixing bacteria includes Rhizobium. Rhizobium lives in symbiotic association with the legume plants in the root nodules and fixes atmospheric nitrogen. Root nodules of legume plants contains leghaemoglobin. This acts as an oxygen scavanger. 

Thus, the correct answer is 'Acts as an oxygen scavanger.'