Tag: biology

Questions Related to biology

Killing of animals disturbs

biology animal world oviparous and viviparous diversity and classification in animals adaptations in animals

  1. Good for eco system

  2. Good for man

  3. The balance of nature

  4. None

Show answer
Correct Option: C

Polar bears live at

biology animal world oviparous and viviparous diversity and classification in animals adaptations in animals

  1. Both North and South Poles

  2. South Pole only

  3. North Pole only

  4. Both Polar regions as well as several forests

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Correct Option: C
Explanation:

Polar bears are large, white bears that like cold climates, fatty meals and long days of hunting. No matter how adorable polar bears look, these animals are not cuddly. In fact, polar bears are ferocious hunters, and they are the biggest carnivores among land animals. Polar bears live in countries that ring the Arctic Circle: Canada, Russia, the United States (in Alaska), Greenland and Norway.  In the winter, temperatures in the Arctic are usually around minus 29 degrees Fahrenheit (minus 34 degrees Celsius) and can reach as low as minus 92 F (minus 69 C). The temperature of the water is frigid, as well, reaching as low as 28 F (minus 2 C), the freezing point of seawater. 

So the correct option is 'north pole only'.

In which plant heterophyllous development does not occur due to environment?

biology animal world oviparous and viviparous diversity and classification in animals adaptations in animals

  1. Coriander

  2. Cotton

  3. Larkspur

  4. Buttercup

  5. Canary grass

Show answer
Correct Option: E
Explanation:
Plants shows different kinds of structure in response to the environment during their development. This is called as plasticity. For example, heterophyllous development occurs in cotton, coriander and larkspur. In these plants, leaves of the young plants are different in shape than the leaves of mature plants. Buttercup also shows plasticity. In this, the shape of leaves is different in air and in water.
Thus, the correct answer is option E.

The seral communities developing on a water body are known as

biology animal world oviparous and viviparous diversity and classification in animals adaptations in animals

  1. Hydrosere

  2. Hydrophyte

  3. Hydrosphere

  4. Hydrologic cycle

Show answer
Correct Option: A
Explanation:

A;Hydrosere - Plant succession occurs in water bodies is called Hydrosere.

B.Hydrophyte - Plants grow in water related areas.
C.Hydrosphere - The area, in which water is present.
D.Hydrological cycle - Cyclic movement of water in nature is called Hydrological cycle
So, the correct option is 'Hydrosere'.

.......... plants are responsible for fixing of nitrogen.

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

  1. Root

  2. Legume

  3. Tomato

  4. Algae

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Correct Option: B
Explanation:
  • In leguminous plants, the nitrogen-fixing bacteria live symbiotically in root nodules. Within these nodules, nitrogen fixation is done by them, and the $NH _3$ produced is absorbed by the plant. 

Manure helps in

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

  1. Enriching soil with nutrients

  2. Organic matter

  3. Increasing soil fertility

  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 because it contains nutrients such as nitrogen, that is trapped by bacteria in the soil. Manure helps in enriching the soil with nutrients and organic matter and increasing soil fertility.

Thus, the correct answer is option D.

Choose the correct options from the following.
Advantage of fertilizers is/are

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

  1. They are nutrient specific and required in small amounts.

  2. They are water soluble and absorbed by the plant easily.

  3. They are easy to store and transport.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Fertilizers are chemically synthesized substances which are rich in plant nutrients such as NPK. They have a rapid response on application. Overuse of fertilizers can cause negative effects like decreased soil fertility, bioaccumulation etc.Although, it is very advantageous as they are nutrient specific and are required in small amounts, they are water soluble and absorbed by the plant easily and are easy to store and transport.

Thus, the correct answer is option D.

Choose the correct options from the following that describe the disadvantage of using manure

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

  1. They have less amount of nutrients as compared to fertilizers.

  2. Manures are bulky and can't be easily stored or transported.

  3. Both A and B

  4. None of the above

Show answer
Correct Option: C
Explanation:

Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganism and used as fertilizers. Disadvantages of a manure are that they have less amount of nutrients as compared to fertilizers, manures are bulky and not easy to store and transport.

Thus, the correct answer is option C.

Fertilizers contain a much higher amount of ___________ in comparison to what they use.

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

  1. Nutrients

  2. Micro-organisms

  3. Earthworms

  4. All of the above

Show answer
Correct Option: A
Explanation:

Fertilizers, chemically synthesized substances which are rich in plant nutrients such as NPK. These artificially used substances are used in very small amount but have a rapid response. But, overuse of fertilizers can cause negative effects such as decreased soil fertility. 

Thus, the correct answer is option A.

Fertilizers supply

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

  1. Nitrogen

  2. Phosphorus

  3. Potassium

  4. All of the above

Show answer
Correct Option: D
Explanation:

Fertilisers, chemically synthesized substances which are rich in plant nutrients such as NPK. Fertilizers supply nitrogen, phosphorus and potassium. They are artificially made but have a rapid response. Overuse of fertilisers can cause negative effects like loose soil fertility.