Tag: improvement in food resources

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Questions Related to improvement in food resources

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

In compositing, solid waste is converted into;

  1. Ashes

  2. Manure

  3. Clinkers

  4. Fumes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Composting converts organic solid waste into nutrient-rich manure through microbial decomposition. This process recycles waste materials into valuable soil amendments that improve soil structure and fertility. The question contains a typo ('compositing' should be 'composting').

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

A few gram seeds were placed in each of the three pots A, B and C containing soil. The soil in Pot A is mixed some green twigs and leaves. The soil in pot B is mixed with old cow dung while soil of pot C is mixed with urea. Pots are watered regularly. Which of the following will be observed after 10 days?

  1. Lot of growth in A

  2. Not much growth in B

  3. Lot of growth in B but very little growth in C

  4. Very little growth in A but lot of growth in B and C
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 microorganism and used as fertilizers. Thus, the fresh manure contains decomposing bacteria along with active digestive enzymes. These enzymes contribute to the faster heating of the manure which accelerates the decomposition of organic materials by the soil microorganisms. The end result of better decomposition of organic material is faster nutrient release to the plant. When urea is placed on the surface of the soil, a chemical reaction takes place that changes the urea to ammonium bicarbonate. Urea should be mixed in with the soil for maximum effectiveness. For plants that love acidic soils, urea is one of the top fertilizers for acidifying soils. Hence, seeds will grow most in pots B and C.

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

Which of the following rotation of crops will reduce dependence on the use of chemical fertilizers?

  1. Rice and Chilli

  2. Wheat and Potato

  3. Potato and Rice

  4. Gram and Rice
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Crop rotation helps the farmers to maintain the fertility of the fields by growing alternate crops. A particular crop with one type of nutrient sown in one season restricts the cultivator to sow the other crop with another type of nutrient  in the next season, which is most beneficial for the field e.g., gram is nitrogen rich crop and rice is sugar rich crop, so, their alternate cropping can give different nutrients to the field and thus, reduces the use of chemical fertilizers.

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

Fairly good yield of rice can be had over a number of years without adding any nitrogenous manures because

  1. They require very minute quantities of nitrogen.

  2. Their roots have nitrogen-fixing bacterial associated with them.

  3. There are nitrogen-fixing algae in the rice fields.

  4. Rice plant do not require any nitrogen.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The rice paddy field contains the Azolla weeds with the nitrogen-fixing cyanobacteria which can help in the conversion of the atmospheric nitrogen to nitrates. This nitrate can be used for the growth of the plants without the introduction of nitrogenous manures externally. These organisms help increase the yield of the rice plants. 

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

Consider the following microbes

A. Azotobacter
B. Azolla
C. Mycorrhiza
D. Nostoc

The aforementioned microbes are

  1. Manure yielding biofertilizers

  2. Converters of atmospheric nitrogen into ammonia

  3. Capable of improving the elements phosphorus, potassium, zinc etc., in soil

  4. The source of nitrogenous fertilizer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Azotobacter, Azolla, Mycorrhiza, and Nostoc are manure yielding biofertilizers. Biofertilizers are organisms that enrich the nutrient quality of the soil. The main sources of biofertilizers are bacteria, fungi, and cyanobacteria.
  • Azotobacter is bacteria that can fix atmospheric nitrogen while free-living in the soil, thus enriching the nitrogen content of the soil.
  • Azolla is a water fern. It lives in a symbiotic relationship with a cyanobacteria Anabaena azollae which fixes nitrogen. It is used as an excellent fertilizer in the rice field.
  • Mycorrhiza is a symbiotic relationship of fungi with roots of higher plants. The fungal symbiont absorbs phosphorus from soil and passes it to plants. Plants having such associations show resistance to root borne pathogens, tolerance to salinity and drought, and an overall increase in plant growth and development.
  • Nostoc is a cyanobacterium. It can fix atmospheric nitrogen. It also adds organic matter to the soil and increases its fertility. 

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

Different types manures are

  1. Farmyard, compost and green

  2. Green and farmyard

  3. Green and compost

  4. Farmyard and compost
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganism and used as fertilizers. Farmyard manure, compost and green manure are the most important and widely used bulky organic manures. Farmyard manure is the decomposed mixture of excreta of farm animals along with litter and leftover material from fodder fed to the cattle. Green manure and compost are the decomposed substance of crop. It is helpful in maintaining soil form, aeration and hydration. 

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

The distribution of fertilizers by aircraft is widely practised in______________ 

  1. England

  2. France

  3. Germany

  4. New Zealand
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Aerial application, or crop dusting, involves spraying crops with crop protection products from an agricultural aircraft. Agricultural aircraft are highly specialized and used for the application of agricultural materials.
  •  It was used by John Chaytor in 1906 to spread seed over a swamped valley floor in Wairoa, New Zealand. 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

Ignition of manure is possible if__________________

  1. Stored in a very large pile

  2. Stored in small piles

  3. Stored near fodder

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

Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganism and used as fertilizers. Thus, the fresh manure contains decomposing bacteria along with active digestive enzymes. These enzymes contribute to the faster heating of the manure which accelerates the decomposition of organic materials by the soil microorganisms. Manure generates heat as it decomposes, and it is possible for manure to ignite spontaneously if stored in a very large pile. 

Therefore, the correct answer is option A.

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

Fertilizers can cause _________________

  1. Burn in plants

  2. Burn in microorganism

  3. Burn in soil

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

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

The unpleasant odor of manure can be prevented by____________

  1. Adding water to it

  2. By using it fresh

  3. Both A and B

  4. By injecting it in the soil
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 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.