Tag: manures and fertilisers

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Questions Related to manures and fertilisers

Multiple choice evs economic importance of plants and animals manure manures and fertilisers role of organic manures in soil management

Which of the following plants is used to extract the blue dye?

  1. Trifolium

  2. Indigofera

  3. Lupin

  4. Cassia
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The name of the plant is Indigofera tinctoria , which is under the family fabaceae.  This plant is used to produce blue denim jeans. On average a single pair of blue denim jeans need 3-12 gram of indigo.

This plant is required to do dye wool and silk products. This plant is normally found in tropical area. Indigo is very safe for the human skin and it is also chemical free.
Correct answer is B.
Multiple choice evs economic importance of plants and animals manure manures and fertilisers role of organic manures in soil management

_____________ is a practice of clearing and burning the forest area for cultivation of crops for 3-4 years and shifting.

  1. Jhum cultivation

  2. Horticulture

  3. Taungya cultivation

  4. Agrisilviculture
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Jhum cultivation, also known as slash-and-burn agriculture, involves clearing forest patches by cutting and burning vegetation to create temporary fields for crop cultivation.

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

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

  1. Simple

  2. Complex

  3. Chemical

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice evs agriculture- crops manure manures and fertilisers role of organic manures in soil management

In high yielding `hybrid crop varieties', to exploit hybrid vigour, the farmers need to purchase fresh hybrid seed every year, because

  1. They are not allowed to grow their own seed

  2. The hybrid vigour is lost due to inbreeding depression

  3. The government of India has accepted Dunkel's proposals

  4. It is cheaper to purchase fresh seed
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hybrid seeds are the result of crossing two genetically distinct inbred lines. If seeds from these hybrids are saved and replanted, the offspring show segregation, leading to a loss of the uniform, high-performing traits known as hybrid vigour.

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

NPK denotes

  1. Nitrogen, protein and kinetic

  2. Nitrogen, protein and potassium

  3. Nitrogen, potassium and kinetic

  4. Nitrogen, phosphorus and potassium
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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.

  1. C and D

  2. A and C

  3. A, B and C

  4. A, B, C and D
Reveal answer Fill a bubble to check yourself
D Correct answer
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'