Tag: biology

Questions Related to biology

Choose the correct options from the following.
Advantage of manure

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

  1. It is cheap.

  2. It reduces soil erosion.

  3. It increases soil fertility, water holding capacity and aeration.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganism and used as fertilizers. Advantages of manure are that it is cheap, it reduce soil erosion, it increases soil fertility, water holding capacity and aeration.

Thus, the correct answer is option D.

Nowadays, organic farming and organic products are very popular. Which of the following is the reason for people to prefer this kind of products?

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

  1. Organic foods may have higher nutritional value than conventional food

  2. Consuming organic food may also reduce exposure to artificial chemicals

  3. It reduces air pollution

  4. All the above

Show answer
Correct Option: D
Explanation:
Cultivation of crops by using bio-fertilizers is called Organic farming and the products obtained from organic farming are called Organic products.
Organic foods have gained popularity because people have become aware of their benefits. They contain no chemical pesticides and fertilizers and are grown naturally with manure or compost and only natural pesticides and insecticides are used. Organic products may have more nutrition values, reduce environmental pollution.
So the correct option is ' All the above ' .

Which of the following conditions will give the most benefits? Why?

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

  1. Farmers use high-quality seeds, do not adopt irrigation or use fertilizers.

  2. Farmers use ordinary seeds, adopt irrigation and use fertilizer.

  3. Farmers use quality seeds, adopt irrigation, use fertilizer and use crop protection measures.

  4. None of these

Show answer
Correct Option: C
Explanation:

For more production of crops and to get more benefits from that farmer should use best quality seeds, proper irrigation, use of fertilizer for better supplement of food and best crop protection. These conditions helps in large crop production at the same time. 

Which compositing can pay its own cost by selling manure produced?

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

  1. Pulverization

  2. Pyrolysis

  3. Manual Compositing

  4. Sea Disposal

Show answer
Correct Option: C

Leftover material in secondary treatment is used as

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

  1. Waste

  2. Manure

  3. Disposed Off

  4. All of Above

Show answer
Correct Option: B

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)?

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

  1. Shikha and Ritesh

  2. Ritesh and Abhishek

  3. Abhishek and Shikha

  4. Shikha only

Show answer
Correct Option: B
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.

Which nutrient is not supplied to crops via fertilizer?

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

  1. Phosphorus

  2. Potassium

  3. Iron

  4. Nitrogen

Show answer
Correct Option: C
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. 

Composted manure is produced from________________

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

  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

Show answer
Correct Option: D
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.

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

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

  1. Decrease the amount of phytoplankton

  2. Kill most bacteria

  3. Lower the compensation point

  4. Increase the amount of phytoplankton

Show answer
Correct Option: D
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. 

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

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

  1. Decomposition of microorganisms

  2. Roots holding capacity

  3. Soil binding capacity

  4. Water holding capacity

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 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.