Tag: evs

Questions Related to evs

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

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

  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

Show answer
Correct Option: A

Leghaemoglobin is produced in response to 

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

  1. Respiration

  2. Fatty acid oxidation

  3. Photosynthesis

  4. $N _2$ -fixation

Show answer
Correct Option: D
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.'

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

  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)

Show answer
Correct Option: A
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)'.

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

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

  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.

Show answer
Correct Option: A
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.'

Which of these crops do not require nitrogen fertilizer?

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

  1. Corn

  2. Soyabean

  3. Grass

  4. Oats

Show answer
Correct Option: B
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'.

Leghaemoglobin is formed for

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

  1. Respiration

  2. Photosynthesis

  3. Nitrogen fixation

  4. Fatty acid synthesis

Show answer
Correct Option: C
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). 

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

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

  1. Mustard

  2. Soyabean

  3. Carrot

  4. Radish

Show answer
Correct Option: B
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'

Which of the following can replenish nutrients in the soil?

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

  1. Fertilizer

  2. Manure

  3. Compost

  4. All of the above

Show answer
Correct Option: D
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.'

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

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

  1. 1 and 3

  2. 1 and 2

  3. 2 alone

  4. 1, 2 and 3

Show answer
Correct Option: B
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'

Organisms which can bring about soil nutrient enrichment are known

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

  1. sympathetic bacteria

  2. Biofertilizers

  3. Soil bacteria

  4. Proxy fertilizers

Show answer
Correct Option: B
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).