Tag: biology

Questions Related to biology

When an endotherms body temperature drops below normal, cold receptors send information to the hypothalamus.

The hypothalamus will send out signals that cause

biology coordination and response control of blood glucose endocrine system and hormone hormones in human reproduction

  1. The organism to seek warmer climate.

  2. The production of brown fat in the neck.

  3. Vasodilation (widening) of blood vessels.

  4. Vasoconstriction (narrowing) of blood vessels.

Show answer
Correct Option: A
Explanation:
  • Endotherms are animals which use internally generated heat to maintain body temperature. For example, birds and mammals.
  • When an endotherms body temperature drops below normal, cold receptors send information to the hypothalamus. The hypothalamus will send out signals that cause the organism to seek a warmer climate.
  • For example, when human body temperature drops below normal, cold receptors present in our body send signals to the hypothalamus. Then the hypothalamus will send out signals that cause us to seek a warmer climate.
  • So, the correct answer is 'The organism to seek warmer climate'.

Pungent odour of faeces is due to

biology coordination and response control of blood glucose endocrine system and hormone hormones in human reproduction

  1. Indole

  2. Scatole

  3. Phenol and hydrogen sulphide

  4. All the above

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Correct Option: D

............... is able to regulate its own body temperature.

biology coordination and response control of blood glucose endocrine system and hormone hormones in human reproduction

  1. Frog

  2. Fish

  3. Snake

  4. Sparrow

  5. Turtle

Show answer
Correct Option: D
Explanation:
Sparrow is able to regulate its own body temperature. A sparrow is the only animal out of that group that is endothermic.
Endothermic animals are those that must generate their own heat to maintain their body temperature. These animals are commonly referred to as "warm-blooded." An animal that is endothermic is categorized as an endotherm, and this includes all mammals. The opposite of an endotherm is an ectotherm.

A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in

biology adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

  1. Polar regions

  2. Deserts

  3. Oceans

  4. Tropical rainforests

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Correct Option: D
Explanation:

Here, the given characteristics depict the features of the tiger. It is one of the topmost predators in the tropical rainforests because its unique adaptation is suitable to live in that environment. One among them is their dark fur coat, blue eyes and black stripes. Here, the black stripes are more than 100 in number and used for identification of tiger. It attacks other animals by surprise so it also knows as ambush predator and tigers are the very fastest animal.

So, the correct answer is option D.

Which option best describes a tropical region?

biology adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

  1. Hot and humid

  2. Moderate temperature, heavy rainfall

  3. Cold and humid

  4. Hot and dry

Show answer
Correct Option: A
Explanation:
Moist tropical climates are known for their high temperatures and a large amount of rain around the year. Due to the high temperature, tropical regions are hot and due to a large amount of rainfall, tropical regions are humid.
So, the answer is A.

Resemblance of one organism to another for protection and hiding is

biology adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

  1. Mimicry

  2. Predation

  3. Adaptation

  4. Camouflage

Show answer
Correct Option: A
Explanation:

  • The ability of an organism to imitate the physiological and morphological characteristics and behavior of an unrelated organism is called as mimicry.

So the correct option is 'Mimicry.'

Which of the following is not a co-enzyme?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. NAD

  2. NADP

  3. FAD

  4. ATP

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Correct Option: D
Explanation:

ATP or adenosine triphosphate is a nucleotide. It is not a co-enzyme.

Select the type of enzyme involved in the above reaction.

$\boxed{S - G + S' \rightarrow S + S' - G}$

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Dehydrogenase

  2. Transferase

  3. Hydrolase

  4. Lyase

  5. Isomerase

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Correct Option: B
Explanation:

Transferases are the enzymes that catalyze group transfer reactions. In the figure, one group G has been transferred to another group S'. It is a classical example of a group transfer reaction.

Who proposed the principle of "Induced fit"?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Jacob

  2. Fischer

  3. Koshland

  4. Laderberg

Show answer
Correct Option: C
Explanation:

The induced-fit model is proposed by Daniel Koshland in 1958. It is the most accepted model for enzyme-substrate complex. It describes the formation of the Enzyme substrate as a result of the interaction between the substrate and a flexible active site which means exposure of an enzyme to a substrate causes the active site of the enzyme to change shape in order to allow the enzyme and substrate to bind. Hence option C is correct.

NADP is

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. A coenzyme

  2. A part of tRNA

  3. An enzyme

  4. A part of rRNA

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Correct Option: A
Explanation:

Coenzymes are organic cofactors which are required for enzymatic action of certain enzymes. NADP is a coenzyme form of vitamin nicotinamide or niacin.