Tag: role of organic manures in soil management

Quizzes (0) Questions (75)

Questions Related to role of organic manures in soil management

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

In a classroom discussion, three students made the following statements.

Shikha: Fertilizers are chemical substances that are rich in a particular nutrient.
Ritesh: Fertilizers increase the water holding capacity of the soil.
Abhishek: Fertilizers used in excess provide lots of humus to the soil.

Which student(s) made incorrect statement(s)?

  1. Shikha and Ritesh

  2. Ritesh and Abhishek

  3. Abhishek and Shikha

  4. Shikha only
Reveal answer Fill a bubble to check yourself
B 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. It is applied to soils or to plant tissues to supply one or more plant nutrients essential to the growth of plants. So, the statement given by Shikha is correct.
  • Fertilizers have a low capacity for holding water and nutrients. So, the statement given by Ritesh is incorrect.
  • The excessive use of fertilizers causes damage to the plants. So, the statement given by Abhishek is incorrect.

Thus, the correct answer is option B.

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

Which nutrient is not supplied to crops via fertilizer?

  1. Phosphorus

  2. Potassium

  3. Iron

  4. Nitrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nitrogen, potassium, and phosphorus are required for the growth of plants in more amounts. These nutrients are absorbed in the form of salts from the soil. However, when the supply from soil is inadequate they are added as fertilizers. Iron is obtained from the soil in sufficient amounts as per the requirement of the plants. So, they are generally not added as the fertilizers. However, there are iron fertilizers which can be added when the soil is deficient in iron. 

Thus, the correct answer is option C. 

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

Composted manure is produced from________________

  1. Farmyard manure and green manure

  2. Farm refuse and household refuse

  3. Organic remains of biogas plants

  4. Rotten vegetables and animal fecal refuse
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Composted manure is produced from rotten vegetables and animal fecal refuse. 
  • In this process, green wastes are collected and dumped in an area and microorganisms like bacteria and fungi degrade them into humus. 
  • This process is aided by shredding the plant matter, adding water and ensuring proper aeration by regularly turning the mixture. 
  • It acts as a good and natural fertilizer for plants.
So, the correct answer is option D.

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

The first effect of adding fertiliser to a pond would most likely be to________

  1. Decrease the amount of phytoplankton

  2. Kill most bacteria

  3. Lower the compensation point

  4. Increase the amount of phytoplankton
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • The fertilizers are the rich source of nitrogen and phosphorous used for the growth of plants.
  •  When the fertilizers are introduced in the pond, these nutrients increase the fertility of the pond. 
  • The phytoplanktons are the autotrophic organisms in the aquatic environment that utilize these nutrients and increase in the number. 
Thus, the correct answer is option D. 

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

Apart from soil fertility, manure also enhances .......... of the soil. 

  1. Decomposition of microorganisms

  2. Roots holding capacity

  3. Soil binding capacity

  4. Water holding capacity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganisms and used as fertilizers. It enhances the water holding capacity of the soil. 
  • It also makes the soil porous which makes the exchange of gases easy.

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

Rhizobium fixes atmospheric _____________

  1. Oxygen

  2. Carbon

  3. Nitrogen

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Rhizobium is the symbiotic soil bacteria that fix nitrogen in leguminous plants. They form a symbiotic relationship with legume and resides in the root nodules of legumes. 
  • They cannot independently fix nitrogen. 

Therefore, the correct answer is option C.

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

.......... increases crop productivity only to some extent.

  1. Fertilizer

  2. Manure

  3. Water

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Manure is organic and provides nutrients slowly, often leading to a more gradual increase in crop productivity compared to chemical fertilizers. Fertilizers are typically designed for more rapid and significant yield increases.

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

Which of the following is a synthetic substance?

  1. Manure

  2. Nutrients

  3. Minerals

  4. Fertilizers
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. The overuse of fertilizers can cause negative effects like loose soil fertility.
Multiple choice biology improvement in food resources manure manures and fertilisers role of organic manures in soil management

Name the macronutrients provided by fertilizers.

  1. Nitrogen

  2. Phosphorous

  3. Potassium

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Fertilizers, the chemically synthesized substances which are very rich in the plant nutrients like nitrogen, phosphorous and potassium.
  • Nitrogen (N) required for the leaf growth 
  • Phosphorus (P) required for the development of roots, flowers, seeds, and fruit 
  • Potassium (K) required for strong stem growth, movement of water in plants, promotion of flowering and fruiting. 

Therefore, the correct answer is option D.