Tag: biology

Questions Related to biology

Fertilizers can cause _________________

biology improvement in food resources manure manures and fertilisers role of organic manures in soil management

  1. Burn in plants

  2. Burn in microorganism

  3. Burn in soil

  4. None of these

Show answer
Correct Option: A
Explanation:

  • Fertilizer can cause burn in the plants when too much fertilizer is applied. It is a chemical compound that can dry out the leaves and damage or even cause the death of the plant. 
  • Fertilizers vary in their tendency to burn roughly in accordance with their salt index. 

Therefore, the correct answer is option A.

The unpleasant odor of manure can be prevented by____________

biology improvement in food resources manure manures and fertilisers role of organic manures in soil management

  1. Adding water to it

  2. By using it fresh

  3. Both A and B

  4. By injecting it in the soil

Show answer
Correct Option: D
Explanation:

  • Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganisms and thus, produces an unpleasant odor. 
  • To prevent such odor they are usually knifed (injected) directly into the soil. Manure from pig and cattle is usually spread on fields using a manure spreader. 

Therefore, the correct answer is option D.

Fertilizers can be classified as__________________

biology improvement in food resources manure manures and fertilisers role of organic manures in soil management

  1. Straight and multinutrient

  2. Inorganic and organic

  3. Synthetic and Inorganic

  4. Both A and B

Show answer
Correct Option: D
Explanation:
  • Fertilizers, chemically synthesized substances that are rich in plant nutrients such as NPK. They are artificially made but have a rapid response. Overuse of fertilizers can cause negative effects such as decreased soil fertility.
  • Fertilizers are classified according to whether they provide a single nutrient (say, N, P, or K), in which case they are classified as straight fertilizers. Multinutrient fertilizers (or complex fertilizers) provide two or more nutrients e.g., N and P. 
  • Fertilizers are also sometimes classified as inorganic and organic on the basis of molecular structure. Organic fertilizers are derived from plant or animal sources, whereas inorganic fertilizers contain minerals and synthetic chemicals.
  • Therefore, the correct answer is option D.

Find out the correct sentence about manure.
i) Manure contains large quantities of organic matter and small quantities of nutrients.
(ii) It increases the water holding capacity of sandy soil.
(iii) It helps in draining out of the excess of water from the clayey soil.
(iv) Its excessive use pollutes the environment because it is made of animal excretory waste.

biology improvement in food resources manure manures and fertilisers role of organic manures in soil management

  1. (i) and (iii)

  2. (i) and (ii)

  3. (ii) and (iii)

  4. (iii) and (iv)

Show answer
Correct Option: B
Explanation:

Bulky organic manure contains large quantities of organic matter and small quantities of nutrients. It increases the water holding capacity of sandy soil. This makes more water available to plants. It prevents the environment pollution, because it recycles the animal excretory waste. Therefore, option B is correct. 

When a fertilizer contains at least two or more nutrients is called as _____ fertilizer.

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

  1. Simple

  2. Complex

  3. Chemical

  4. None of the above

Show answer
Correct Option: B
Explanation:

Complex fertilizers (also known as compound fertlizers) are made from mixing two or more of macro-nutrient type fertilizers. They may also be further blended with elements that provide some of the less-common plant nutrients (known as secondary or trace nutrients, such as sulfur, calcium and magnesium).

Thus, the correct answer is option B.

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.