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

What is manure?

  1. It is a natural material obtained by decaying plant and animal waste.

  2. It is a synthetic material prepared in laboratory.

  3. It is a semi synthetic material.

  4. It can be both natural and synthetic.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Manure is a natural material, obtained by decaying plant and animal waste, that can be applied to the soil to enhance its fertility. Manure usually consist of faeces and urine of domestic livestock, with or without accompanying litter such as straw, hay, or bedding. The most common sources of manure are cows, horses, sheep.

So, the correct answer is 'It is a natural material obtained by decaying plant and animal waste '.

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

The organic manure is considered better than fertilisers because

  1. It can be prepared in the factories.

  2. It is less rich in plant nutrient.

  3. It improves the texture of the soil.

  4. It decreases the water holding capacity of the soil.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The organic manure contains a high amount of organic matter which increases the capability of the soil to hold the water. They are prepared by the decomposition of the organic matter by the microbes. They are highly rich in the plant nutrients. They also help to improve the quality and texture of the soil. The gaseous exchange takes place easily in this soil which allows the germination and growth of the plants properly. 

Thus, the correct answer is option C. 

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

The nodules present in the leguminous plants appear pink in colour due to the presence of 

  1. RBC.s

  2. leghaemoglobin

  3. nitrogenase enzyme

  4. bacterial secretion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Leghaemoglobin is an oxygen-binding protein found in the root nodules of leguminous plants. It gives the nodules their characteristic pink or red color.

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

Which of the following statements is incorrect about leghaemoglobin?

  1. It acts as $O _2$ scavenger

  2. It imparts pink or red colour to the nodules
  3. It combines with $O _2$ and protects nitrogenase

  4. It is a Mo-Fe protein.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Leghaemoglobin is an iron-containing protein (a hemoprotein), not a Molybdenum-Iron (Mo-Fe) protein. Nitrogenase is the Mo-Fe protein involved in nitrogen fixation.

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

Read the following statements and select the correct answer: - 


(i) Rhizobium leguminosarum is also known as Bacillus radicicola.
(ii) Nitrifying bacteria (Nitrosomonas, etc) are chemoautotrophs.
(iii) Enzyme nitrogenase fixes $N _2$ under aerobic conditions.
(iv) Leghaemoglobin creates aerobic conditions for the enzyme nitrogenase. 

  1. Statements (i), (ii) and (iii) are correct

  2. Statements (i) and (ii) are correct

  3. Statements (iii) and (iv) are correct

  4. All statements are correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statements I and ii are correct. Rhizobium leguminosarum is also known as Bacillus radicicola. Nitrifying bacteria (Nitrosomonas, etc) are chemoautotrophs. They use inorganic energy sources. However, the enzyme nitrogenase is highly sensitive to oxygen and gets readily oxidised in it's presence and Leghaemoglobin creates anerobic conditions for the enzyme nitrogenase by scavenging the oxygen molecules.

Thus, the correct answer is 'Statements (i) and (ii) are correct.' 

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

Biofertilizers are organisms that enrich the nutrient quality of the soil. Which of the following can be used as biofertilisers ?

  1. Nitrogen fixing cyanobacteria

  2. Nitrogen fixing bacteria

  3. Mycorrhizae

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Nitrogen fixing cyanobacteria, Nitrogen fixing bacteria and mycorrhizae all can be used as biofertilisers as they all enrich the nutrient quality of the soil.
So, the correct option is 'All of these'
Multiple choice evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

If by radiation all nitrogenase enzyme is inactivated, then there will be no.

  1. fixation of nitrogen in legumes

  2. conversion of nitrate into nitrogen

  3. conversion from nitrate to nitrate in legumes

  4. conversion from ammonium to nitrate in soil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitrogenase is the essential enzyme for biological nitrogen fixation. If it is inactivated, the plant cannot convert atmospheric nitrogen into ammonia.

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

Leghaemoglobin is produced in response to 

  1. Respiration

  2. Fatty acid oxidation

  3. Photosynthesis
  4. $N _2$ -fixation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Leghaemoglobin is produced by legumes in response to the roots being colonized by nitrogen-fixing bacteria, termed rhizobia, as part of the symbiotic interaction between plant and bacterium. 
Thus, the correct answer is 'N$ _2$ - fixation.'

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

Match column I with column II and select the correct answer from the given codes. 

Column I    Column II
A. Azolla (i) Symbiotic $N _2$ - fixer
B. Rotenone (ii) Symbiotic association with $N _2$ - fixing cyanobacteria
C. Crotolaria juncea  (iii) Natural insecticide
D. Frankia (iv) Green manure

  1. A-(ii), B-(iii), C-(iv), D-(i)

  2. A-(ii), B-(iv), C-(iii), D-(i)

  3. A-(iii), B-(i), C-(iv), D-(iii)

  4. A-(i), B-(iii), C-(iv), D-(ii)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
 Azolla  Symbiotic association with N2N2 - fixing cyanobacteria
 Rotenone  Natural insecticide
 Crotolaria juncea  Green manure
 Frankia Symbiotic N2N2 - fixerN2

So, the correct option is 'A-(ii), B-(iii), C-(iv), D-(i)'.