Tag: evs

Quizzes (439) Questions (4580)

Questions Related to evs

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)'.

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

Function of leghaemoglobin (a red pigment) in root nodules of leguminous plants is

  1. to regulate $O _2$ supply in cells
  2. to regulate $CO _2$ supply in cells

  3. to regulate production of phenolic compounds

  4. to regulate the Mo supply in cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Leghemoglobin supports the centralization of free oxygen in the cytoplasm of contaminated plant cells to guarantee the best possible capacity of root knobs. Its capacity is to help give oxygen to the breathing harmonious bacterial cells in root nodules of leguminous plants in a way practically equivalent to hemoglobin transporting oxygen to breathing tissues in creatures.

Thus, the correct answer is 'to regulate O$ _2$ supply in cells.'

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

Which of these crops do not require nitrogen fertilizer?

  1. Corn

  2. Soyabean

  3. Grass

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

Soya bean is a legume. Leguminous plants contain root nodules. Nitrogen fixing bacteria rhizobium is present in the root nodules of leguminous plants which fix the nitrogen naturally. So, it does not require an outer supplement for nitrogen or nitrogen fertilizer.

Thus, the correct answer is 'Soyabean'.

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

Leghaemoglobin is formed for

  1. Respiration

  2. Photosynthesis

  3. Nitrogen fixation

  4. Fatty acid synthesis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The root nodules of the leguminous plants contain an oxygen-binding heme protein called leghemoglobin. Leghemoglobin is present in the cytoplasm of infected nodule cells at high concentrations 
This leghemoglobin has a high affinity for oxygen, (approximately, ten times higher than the ß chain of human hemoglobin). The function of leghemoglobin is to help transport oxygen to the respiring symbiotic bacterial cells in a manner analogous to hemoglobin transporting oxygen to respiring tissues in animals which helps in the fixation of nitrogen.
Thus, the correct answer is option (C). 
Multiple choice evs a seeds tells a farmer's story manure manures and fertilisers water absorption organ

Leghaemoglobin (A red colored haemoprotein) having an affinity for oxygen is present in the roots of

  1. Mustard

  2. Soyabean

  3. Carrot

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

Leghaemoglobin is a hemoprotein found in the root nodules of leguminous plants.  In plants colonized by Rhizobium, such as alfalfa or soybeans, the presence of oxygen in the root nodules would reduce the activity of the oxygen-sensitive nitrogenase, an enzyme responsible for the fixation of atmospheric nitrogen.   

So, the correct answer is 'soya bean'

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

Which of the following can replenish nutrients in the soil?

  1. Fertilizer

  2. Manure

  3. Compost

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are different methods by which nutrients in the soil can be replenished. Fertilizers and manures contain plant nutrients such as nitrogen, phosphorus, potassium. Fertilizer can be added to the soil. It helps in replenishing exhausted soils with rich sources of organic nutrients. Manure is environment friendly and replenishes the soil with organic nutrients. Compost is decomposed organic material. It reintroduces living organisms and nutrients in the soil. It improves soil structure and provides a healthy environment for plant roots. 

Thus, the correct answer is 'All of the above.'

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

Which of the following is/are used as blofertillsers?
1. Azolla
2. Blue-green algae
3. Alfalfa

  1. 1 and 3

  2. 1 and 2

  3. 2 alone

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Azolla and BGA are used as biofertilizers in the rice field because they increase the yield of the paddy or rice by supplying the plant with all the nutritional elements

So, the correct option is '1 and 2'

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

Organisms which can bring about soil nutrient enrichment are known

  1. sympathetic bacteria

  2. Biofertilizers

  3. Soil bacteria

  4. Proxy fertilizers
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Through the use of biofertilizers, healthy plants can be grown, while enhancing the sustainability and the health of the soil. ... Biofertilizers such as Rhizobium, Azotobacter, Azospirilium and blue green algae (BGA) have been in use a long time. Rhizobium inoculant is used for leguminous crops. So, the correct option is "B" (Biofertilizers).