Tag: improvement in food resources

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

Fertilizers can be classified as__________________

  1. Straight and multinutrient

  2. Inorganic and organic

  3. Synthetic and Inorganic

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice biology improvement in food resources manure manures and fertilisers role of organic manures in soil management

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.

  1. (i) and (iii)

  2. (i) and (ii)

  3. (ii) and (iii)

  4. (iii) and (iv)
Reveal answer Fill a bubble to check yourself
B Correct answer
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.