Tag: biology

Questions Related to biology

Potassium nitrate fertilizer contains .......... of nitrogen.

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

  1. 46%

  2. 44%

  3. 21%

  4. 13%

Show answer
Correct Option: D
Explanation:

Potassium nitrate is one of the common fertilizer which is used for the growth of the plants. Potassium nitrate contains about 13% of nitrogen. There is about 44% of potassium in oxide form. The addition of this fertilizer generally results in an increase in the pH. This fertilizer readily supplies nitrogen to the soil which can be taken up by the plants. 

Thus, the correct answer is option D. 

50 kg of superphosphate adds .......... of phosphorus to the soil.

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

  1. 8%

  2. 10%

  3. 13%

  4. 44%

Show answer
Correct Option: A
Explanation:

There are different forms of fertilizers which are used for supplying phosphorus. Superphosphate is the common synthetic form of fertilizer which is used for enriching the soil with phosphate. About 50 kg of superphosphate adds 8% of phosphorus to the soil. Triple phosphate can also be used for adding phosphate to the soil. 

Thus, the correct answer is option A. 

A fertiliser has a formula of three figures $15-9-9$. They stand for percentage of.

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

  1. N, Ca and Mg

  2. Mg, P and K

  3. Ca, N and Fe

  4. N, P and K

Show answer
Correct Option: D
Explanation:

The three numbers on fertilizer represent the value of the three macro-nutrients used by plants. These macro-nutrients are nitrogen (N), phosphorus (P) and potassium (K) or NPK for short. NPK fertilizer is a complex fertilizer comprised primarily of the three primary nutrients required for healthy plant growth. Nitrogen is essential for green plant growth and enables plants to manufacture food from sunlight through photosynthesis. Phosphorus aids the plant in the earliest stages of development and facilitates the reproductive fruiting process. Potassium boosts plant vigour and disease and stress resistance.

So the correct option is ' N, P and K'.

Which of the following is the phosphatic fertilizer?

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

  1. Urea

  2. NPK

  3. Superphosphate

  4. None of the above

Show answer
Correct Option: C
Explanation:
Superphosphate is a phosphatic fertilizer. It is most commonly found as single super phosphate, double super phosphate and triple super phosphate. The main component of this fertilizer is phosphate. It's phosphate part get dissolved in the soil water when it is applied in the field. The dissolved phosphorus is easily taken up by the roots of growing plants. Whereas, urea is a nitrogen fertilizer and NPK is made up of nitrogen, phosphorus and potassium. So, the correct option is C. 

Which of the following is not of the three plant macronutrients included in most fertilizers?

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

  1. O

  2. N

  3. P

  4. K

Show answer
Correct Option: A

The high protein content of legumes(pluses) is correlated with.

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

  1. Application of fertilizers to the soil

  2. Nitrogen content of the soil

  3. Nitrogen-fixing bacteria present in the roots

  4. Their tropical or temperate origin

Show answer
Correct Option: A

"Fish meal" is widely used as which among the following?

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

  1. Cost effective Food

  2. Poultry Feed Additive

  3. Organic Fertilizer

  4. Bird food

Show answer
Correct Option: C

Which one of the following nutrients is not available in fertilizers ?

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

  1. nitrogen

  2. phosphorus

  3. iron

  4. potassium.

Show answer
Correct Option: C
Explanation:

Nitrogen, phosphorus and potassium (NPK) are the major source available in fertilizers. The most common synthetic fertilizers used in India are super phosphate, urea, calcium ammonium nitrate, ammonium sulphate and NPK fertilizers. 

Fertiliser obtained from sea birds along the coast of Chile and Peru is

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

  1. Guano

  2. Bone meal

  3. Dung

  4. Urea

Show answer
Correct Option: A
Explanation:

Guano is the accumulated excrement of seabirds and bats. As a manure, guano is a highly effective fertilizer due to its exceptionally high content of nitrogen, phosphate and potassium: nutrients essential for plant growth.Seabird guano consists of nitrogen-rich ammonium nitrate and urate, phosphates, as well as some earth salts and impurities. Bat guano is faecal excrement from bats. Commercially harvested bat guano is used as an organic fertilizer. All commercially sold bat guano is derived from insect-eating bats.

If the systolic pressure is 120 mm Hg and diastolic pressure is 80 mm Hg, the pulse pressure is ____.

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. 120 x 80 = 9600 mm Hg

  2. 120 + 80 = 200 mm Hg

  3. 120-80 = 40 mm Hg

  4. $\frac {120}{80}$ = 1.5 mm Hg

Show answer
Correct Option: C
Explanation:
The pulse pressure can be defined as the difference between the diastolic and systolic pressure of an individual’s heart. If the normal diastolic and systolic pressure of the adult human heart is 120 mm Hg and 80 mm Hg, respectively then the pulse pressure is 120 - 80 = 40 mm Hg.
Thus, the correct answer is '120-80 = 40 mm Hg.'