Tag: biology

Questions Related to biology

Which of the methods of ploughing is mostly practised?

biology modern agriculture modern equipments in agriculture soil quality methods of crop production

  1. Outside to inside ploughing

  2. Inside to outside ploughing

  3. Ploughing by putting furrow from one side of field

  4. Ploughing by halai making

Show answer
Correct Option: D
Explanation:

Ploughing is the method of sowing seeds, cutting furrows and turning the soil. It is done by the tool called plough. Ploughing by halai making is the method which is most practiced. It is the easiest method of ploughing.

So, the correct option is 'Ploughing by halai making'.

Conservation tillage is :

biology modern agriculture modern equipments in agriculture soil quality methods of crop production

  1. Terrace tillage

  2. Reduced tillage

  3. No tillage

  4. Both B and C

Show answer
Correct Option: D
Explanation:
Conservation tillage is a tillage system that creates a suitable soil environment for growing a crop and that conserves soil, water and energy resources mainly through the reduction in the intensity of tillage, and retention of plant residues. The most important advantage of conservation tillage systems is significantly less soil erosion due to wind and water.  No tillage farming is a way of growing crops or pasture from year to year without disturbing the soil through tillage. No tillage is an agricultural technique which increases the amount of water that infiltrates into the soil, the soil's retention of organic matter and its cycling of nutrients. Reduced tillage  is a practice of minimising soil disturbance and allowing crop residue or stubble to remain on the ground instead of being thrown away or incorporated into the soil. In terracing, wide steps are cut around the slopes of hills to prevent soil erosion. Since, both reduced and no tillage indulge in soil and water conservation, same as the conservation tillage
So, the correct answer is 'Both B and C'

Which one of the following statements regarding CO gas is correct ?

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. It is produced by the complete combustion of fossil fuels.

  2. It combines with haemoglobin to form carbamino-haemoglobin.

  3. It impairs oxygen transport resulting in giddiness, headache, asphyxia and even death.

  4. All of these

Show answer
Correct Option: C
Explanation:

Carbon monoxide ( CO ) is produced due to incomplete combustion of fossil fuels, metallurgical operations, automobile emission, cigarette smoking. CO combines with haemoglobin, produces carboxyhaemoglobin which impairs oxygen transport resulting in headache, decreased vision, cardiovascular disease, asphyxia.

If the carbon atoms fixed by producers already have passed through three species, the tropic level of the last species would be.

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. Scavenger

  2. Tertiary producer

  3. Tertiary consumer

  4. Secondary consumer

Show answer
Correct Option: C
Explanation:

If the carbon atoms fixed by producer already have passed through three species then the trophic level of the last species(i.e., third species) would be tertiary consumer.
Producers $\rightarrow 1^o$ consumers $\rightarrow 2^o$ consumers $\rightarrow 3^o$ consumers.

Which of the following is the largest reservoir of carbon?

biology ecology carbon cycling mineral coal carbon cycle

  1. Soil

  2. Atmosphere

  3. Ocean

  4. Sedimentary rocks

Show answer
Correct Option: C
Explanation:

In the ocean, there are underwater sediments and sediment rocks of carbonate like in the form of limestone, dolomite etc. Thus, the correct answer is option C.

How does photosynthesis help to maintain the percentage of oxygen and carbon dioxide in the atmosphere?

biology ecology carbon cycling mineral coal carbon cycle

  1. By giving off carbon dioxide and absorbing oxygen

  2. By giving off oxygen and absorbing carbon dioxide

  3. By releasing oxygen and carbon dioxide

  4. By absorbing oxygen and carbon dioxide.

Show answer
Correct Option: B
Explanation:

During photosynthesis, carbon dioxide is fixed to form carbohydrate by the dark reaction. The water molecules are broken down during the light reaction and release oxygen. Thus, the two process helps to maintain the balance of oxygen and carbon dioxide in the atmosphere.

So, the correct answer is option B.

Biochemical cycle with gaseous phase is

biology ecology carbon cycling mineral coal carbon cycle

  1. Carbon

  2. Sodium

  3. Phosphorus

  4. Magnesium

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Correct Option: A

Which of the following gases has role an important in maintaining atmospheric temperature?

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. Nitrogen

  2. Oxygen

  3. Argon

  4. Carbon dioxide

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Correct Option: D

Major 'reservoirs' of $CO _{2}$ are:

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. Land, water, plants

  2. Fossil fuel, soil, , oceans

  3. Volcanic Eruption

  4. Deforestation

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Correct Option: B

Affinity of hemoglobin for CO is two hundred times more considerable than

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. $O _{2}$

  2. $CO _{2}$

  3. Sox

  4. Nox

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Correct Option: A