Tag: natural resources and agriculture

Questions Related to natural resources and agriculture

NPK denotes

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. Nitrogen, protein and kinetic

  2. Nitrogen, protein and potassium

  3. Nitrogen, potassium and kinetic

  4. Nitrogen, phosphorus and potassium

Show answer
Correct Option: D
Explanation:

NPK stands for Nitrogen, Phosphorous and Potassium as this abbreviation has three letters representing the names of the respective elements. It is used as a 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.

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. C and D

  2. A and C

  3. A, B and C

  4. A, B, C and D

Show answer
Correct Option: D
Explanation:
  • 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'

Nitrogen content of urea is____________

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. 46%

  2. 36%

  3. 26%

  4. 56%

Show answer
Correct Option: A
Explanation:

  • Urea is also known as nitrogen fertilizer as it contains 46% nitrogen. It is a white crystalline solid powder used in agriculture as a fertilizer to improve the crop yield. 

Thus the correct answer is option A.

Which of the following fertilizer contains insoluble citric acid?

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. Potassium fertilizers

  2. Nitrogen fertilizers

  3. Phosphatic fertilizers

  4. Biofertilizers

Show answer
Correct Option: C
Explanation:

There are different forms of phosphatic fertilizers. There are citrate soluble and insoluble forms of phosphoric fertilizers. rock phosphate and bone meal are the common examples of phosphatic fertilizers. These fertilizers contain the insoluble form of citric acid and does not dissolves in the water.

Thus, the correct answer is option C. 

Which of the following fertilizer is used for the increased production of coffee, corn and soybeans?

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. Phosphatic fertilizer

  2. Nitrogenous fertilizer

  3. Potassium fertilizer

  4. Nitrogen and potassium combined fertlizer

Show answer
Correct Option: D
Explanation:
The increase in fertilizer consumption is a fundamental driver for increasing agricultural productivity. so, for increasing the production of coffee, corn and soyabeans nitrogen and potassium combined fertilizer is used. Nitrogen helps plants grow quickly, while also increasing the production of seed and fruit, and bettering the quality of leaf and forage crops and Potassium, assists in photosynthesis, fruit quality, the building of protein, and the reduction of disease.
So, the correct answer is option D.

Potassium nitrate fertilizer contains .......... of nitrogen.

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. 46%

  2. 44%

  3. 21%

  4. 13%

Show answer
Correct Option: D
Explanation:

Potassium nitrate is one of the common fertilizer which is used for the growth of the plants. Potassium nitrate contains about 13% of nitrogen. There is about 44% of potassium in oxide form. The addition of this fertilizer generally results in an increase in the pH. This fertilizer readily supplies nitrogen to the soil which can be taken up by the plants. 

Thus, the correct answer is option D. 

50 kg of superphosphate adds .......... of phosphorus to the soil.

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. 8%

  2. 10%

  3. 13%

  4. 44%

Show answer
Correct Option: A
Explanation:

There are different forms of fertilizers which are used for supplying phosphorus. Superphosphate is the common synthetic form of fertilizer which is used for enriching the soil with phosphate. About 50 kg of superphosphate adds 8% of phosphorus to the soil. Triple phosphate can also be used for adding phosphate to the soil. 

Thus, the correct answer is option A. 

A fertiliser has a formula of three figures $15-9-9$. They stand for percentage of.

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. N, Ca and Mg

  2. Mg, P and K

  3. Ca, N and Fe

  4. N, P and K

Show answer
Correct Option: D
Explanation:

The three numbers on fertilizer represent the value of the three macro-nutrients used by plants. These macro-nutrients are nitrogen (N), phosphorus (P) and potassium (K) or NPK for short. NPK fertilizer is a complex fertilizer comprised primarily of the three primary nutrients required for healthy plant growth. Nitrogen is essential for green plant growth and enables plants to manufacture food from sunlight through photosynthesis. Phosphorus aids the plant in the earliest stages of development and facilitates the reproductive fruiting process. Potassium boosts plant vigour and disease and stress resistance.

So the correct option is ' N, P and K'.

Which of the following is the phosphatic fertilizer?

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. Urea

  2. NPK

  3. Superphosphate

  4. None of the above

Show answer
Correct Option: C
Explanation:
Superphosphate is a phosphatic fertilizer. It is most commonly found as single super phosphate, double super phosphate and triple super phosphate. The main component of this fertilizer is phosphate. It's phosphate part get dissolved in the soil water when it is applied in the field. The dissolved phosphorus is easily taken up by the roots of growing plants. Whereas, urea is a nitrogen fertilizer and NPK is made up of nitrogen, phosphorus and potassium. So, the correct option is C. 

Which of the following is not of the three plant macronutrients included in most fertilizers?

biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

  1. O

  2. N

  3. P

  4. K

Show answer
Correct Option: A