Tag: a seeds tells a farmer's story

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Questions Related to a seeds tells a farmer's story

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

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

  1. Fertilizer

  2. Compost

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

Biofertilizers are preferred over chemical fertilisers because

  1. They are cheap

  2. They do not cause pollution

  3. They are harmful

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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' .
Multiple choice evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

Biofertilizers increase the _________ content of the soil.

  1. Nutrient

  2. Humus

  3. Water

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Insecticides.

  2. Pesticides.

  3. Biofertilizers.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Which of the following microorganism is used to prepare biofertilizers? 

  1. Algae

  2. Protozoa

  3. Virus

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Anthocyanin

  2. Phycocyanin

  3. Phycoerythrin

  4. Leghaemoglobin
Reveal answer Fill a bubble to check yourself
D Correct answer
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.'

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

Which of the following is correct about legumes?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.'

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

In root nodules of legumes, the role of leghemoglobin is

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.'