Tag: manure

Questions Related to manure

A red pigment present in the root nodules of leguminous plants is known as

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

  1. Phycoerythrin

  2. Bacteriochlorophyll

  3. Leghaemoglobin

  4. Bacterioviridin

Show answer
Correct Option: C
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 plants are used as green manure in crop field and in sandy soils?

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

  1. Crotalaria juncea and Alhagi camelorum

  2. Calotropis procera and Phyllanthus niruri

  3. Saccharum munja and Lantana camara

  4. Dichanthium annulatum and Azolla nilotica

Show answer
Correct Option: A
Explanation:

Crotalaria juncea and Alhagi camelorum are used as green manure in crop fields and sandy soils because these plants, when grown, replenish the soil with sufficient nutrients and nitrogen content after its usage by the crop plant.

So, the correct option is 'Crotalaria juncea and Alhagi camelorum'.

Leghaemoglobin functions as

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

  1. Oxygen scavenger

  2. Nitrogen scavenger

  3. $CO _2$ scavenger

  4. Hydrogen carrier

Show answer
Correct Option: A
Explanation:

The root nodules of the leguminous plants contain an oxygen-binding heme protein called leghemoglobin. It is present in the cytoplasm of infected nodule cells at high concentrations. 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. It has a high affinity for oxygen (approximately, ten times higher than the ß chain of human hemoglobin). Thus, it acts as a oxygen scavenger.
Hence, the correct answer is option (A).

Identify the role of lectins in formation of root nodules in legumes.

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

  1. Formation of shepherd's crook

  2. Recognition of compatible Rhizobium by host

  3. Formation of peribacterial membrane

  4. Formation of infection thread

Show answer
Correct Option: B

Function of red pigment leghaemoglobin present in root nodules of leguminous plants is to regulate

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

  1. $CO _2$ supply in cells

  2. Mo supply to cells

  3. $O _2$ supply to cells

  4. Production of phenolic compounds

Show answer
Correct Option: C
Explanation:
The root nodules of the leguminous plants contain an oxygen-binding heme protein called leghemoglobin. It 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). Its function is to help transport oxygen to the respiring symbiotic bacterial cells in a manner analogous to hemoglobin transporting oxygen to respiring tissues in animals. Thus, it regulates oxygen supply to the cells.
Thus, the correct answer is option (C). 

Leghaemoglobin takes part in

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

  1. Energy release

  2. Stimulating growth of rhizobium

  3. $N _2$ absorption

  4. Protecting nitrogenase from $O _2$

  5. Supply of oxygen

Show answer
Correct Option: D
Explanation:

The root nodules contain pink colored pigment contains a protein called leg-hemoglobin.

Leg-haemoglobin acts as an oxygen scavenger and provides anaerobic conditions to the bacteria.
So the correct answer is 'protecting nitrogenase from oxygen'

Leghaemoglobin occurs in

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

  1. Coralloid root

  2. BGA

  3. Around bacterial infections of root nodules

  4. Mycorrhiza

Show answer
Correct Option: C
Explanation:

Leghaemoglobin is an oxygen carrier found in the nitrogen fixing root nodules of leguminous plants. Rhizobium is a free living bacteria that can fix atmospheric nitrogen.

Steps involved in nodule formation are
1.Rhizobium bacteria contact a susceptible root hair.
2.After this they will divide near it.
3.Then Rhizobium infects the root hair causing it to curl.
4.Infected thread carries the bacteria to the inner cortex.
5.The bacteria get modified into rod shaped bacteroids and cause inner cortical and pericycle cells to divide.
6.Division lead to nodule formation.
So the correct answer is 'Around bacterial infections of root nodules'

Rhizobium induced root nodules are internally pinkish due to

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

  1. Carotene

  2. Leghaemoglobin

  3. Haemoglobin

  4. Xanthophyll

Show answer
Correct Option: B
Explanation:

Leghaemoglobin present in plant nodules ,impart a characteristic pink colour to the roots.

Correct answer-B

Apart from bacteria, which of the following microbes help in nutrient replenishment in the soil?

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

  1. Protozoa

  2. Fungi

  3. Virus

  4. Lichens

Show answer
Correct Option: A
Explanation:

Protozoa play a major role in replenishing nutrients in the soil. Protozoa have a lower concentration of nitrogen in their cells than the bacteria they eat. Therefore, they obtain and utilize the amount of nitrogen needed and release the excess in the form of ammonium, thereby making it available for use by plants and other soil organisms.   

So the correct option is 'Protozoa'

Which of the following helps the plant to absorb nitrogen from the environment?

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

  1. Algae

  2. Lichens

  3. Rhizobium

  4. None of the above

Show answer
Correct Option: C
Explanation:

Plants are not capable of fixing nitrogen on their own, but need it in one or the other form to make proteins and amino acids. Legumes form root nodules, when they exist in a symbiotic relationship with 'Rhizobia' and therefore, have high levels of nitrogen available to them. These soil bacteria (e.g., Rhizobium, Mesorhizobium, Sinorhizobium) fix the atmospheric nitrogen or dinitrogen, into inorganic compounds, like ammonium, which is then converted into amino acids, which the plants can utilize.

So the correct option is 'Rhizobium'