3
Question
Which of the following statements are correct?
A. Ammonia is the major source of nitrogenous fertilizer in plants.
B. Biofertilizer culture of Azotobacter is available in the market and it is highly effective for crops like coconut, tapioca, sugar cane, etc.
C. The special type of cell known as heterocyst present in the blue-green algae is responsible for atmospheric nitrogen fixation in Azolla.
D. Mycorrhizal fungi help the plants receive phosphorus fertilizer.
Which of the following statements are correct?
A. Ammonia is the major source of nitrogenous fertilizer in plants.
B. Biofertilizer culture of Azotobacter is available in the market and it is highly effective for crops like coconut, tapioca, sugar cane, etc.
C. The special type of cell known as heterocyst present in the blue-green algae is responsible for atmospheric nitrogen fixation in Azolla.
D. Mycorrhizal fungi help the plants receive phosphorus fertilizer.
B. Biofertilizer culture of Azotobacter is available in the market and it is highly effective for crops like coconut, tapioca, sugar cane, etc.
C. The special type of cell known as heterocyst present in the blue-green algae is responsible for atmospheric nitrogen fixation in Azolla.
D. Mycorrhizal fungi help the plants receive phosphorus fertilizer.
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Solution
The correct option is D A, B, C and D
- Some ammonia is converted into nitric acid which itself is used in the manufacture of fertilizers and explosives. Ammonia is also a useful ingredient in some cleaning fluids. Ammonia is a vital route by which nitrogen in the air can be made available to plants to enable them to build protein molecules.
Biofertilizers (i) They help in the establishment and growth of crop plants and trees. (ii) They enhance biomass production and grain yields by 10-20 percent. (iii) They are useful in sustainable agriculture. (iv) They are suitable for organic farming.AzotobacterApplication of Azotobacter has been found to increase the yield of coconut, tapioca, sugarcane, wheat, rice, maize, pearl millet and sorghum by 0-30 p.c. over control. Apart from nitrogen, this organism is also capable of producing antifungal and antibacterial compounds, hormones.AzospirillumCertain micro-organisms like bacteria and blue-green algae have the ability to use atmospheric nitrogen and transport this nutrient to the crop plants. Azospirillum is inoculated to maize, barley, oats, sorghum, pearl millet, and forage crops. It increases the grain productivity of cereals by 5-20%, of millets by 30% and fodder by over 50%.Blue-green algae- The utilization of blue-green algae as a biofertilizer for rice is very promising. A judicious use of these algae could provide to the country’s entire rice acreage as much nitrogen as obtained from 15-17 lakh tones of urea. Algae also helps to reduce soil alkalinity.AzollaA small floating water form Azolla is commonly seen in low land fields and in shallow freshwater bodies. This fern harbors a blue-green algae. Anabaena azollae The Azolla – Anabaena association is alive floating nitrogen factory using energy from photosynthesis to fix atmospheric nitrogen accounting to 100-150 kg N/ha/year from about 40 – 60 tones of biomass.Mycorrhizae:It is the symbiotic association of fungi with the roots of vascular plants. It is useful in increasing phosphorus uptake e.g. in fruit crops like citrus, papaya.So, the correct answer is 'A, B, C and D'
- Some ammonia is converted into nitric acid which itself is used in the manufacture of fertilizers and explosives. Ammonia is also a useful ingredient in some cleaning fluids. Ammonia is a vital route by which nitrogen in the air can be made available to plants to enable them to build protein molecules.
Biofertilizers
(i) They help in the establishment and growth of crop plants and trees.
(ii) They enhance biomass production and grain yields by 10-20 percent.
(iii) They are useful in sustainable agriculture.
(iv) They are suitable for organic farming.
Azotobacter
Application of Azotobacter has been found to increase the yield of coconut, tapioca, sugarcane, wheat, rice, maize, pearl millet and sorghum by 0-30 p.c. over control. Apart from nitrogen, this organism is also capable of producing antifungal and antibacterial compounds, hormones.
Azospirillum
Certain micro-organisms like bacteria and blue-green algae have the ability to use atmospheric nitrogen and transport this nutrient to the crop plants. Azospirillum is inoculated to maize, barley, oats, sorghum, pearl millet, and forage crops. It increases the grain productivity of cereals by 5-20%, of millets by 30% and fodder by over 50%.
Blue-green algae
- The utilization of blue-green algae as a biofertilizer for rice is very promising. A judicious use of these algae could provide to the country’s entire rice acreage as much nitrogen as obtained from 15-17 lakh tones of urea. Algae also helps to reduce soil alkalinity.
Azolla
A small floating water form Azolla is commonly seen in low land fields and in shallow freshwater bodies. This fern harbors a blue-green algae. Anabaena azollae The Azolla – Anabaena association is alive floating nitrogen factory using energy from photosynthesis to fix atmospheric nitrogen accounting to 100-150 kg N/ha/year from about 40 – 60 tones of biomass.
Mycorrhizae:
It is the symbiotic association of fungi with the roots of vascular plants. It is useful in increasing phosphorus uptake e.g. in fruit crops like citrus, papaya.
So, the correct answer is 'A, B, C and D'
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