Tag: biology

Questions Related to biology

Identify typical dental formula of a metatherian.

biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

  1. i 5/4. c 1/1, pm 3/3, m 4/4

  2. i 3/3, c 1/1, pm 4/4, m 3/3

  3. i 4/3, c 1/1, pm 3/3, m 4/4

  4. i 4/5, c 1/1, pm 3/3, m 4/4

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Correct Option: A
Explanation:

There is only one set of teeth functional throughout life with the exception of a milk molar which is replaced by the last premolar. Incisors are more numerous than in placentals. 3 premolars and 4 molars as against 4 P and 3 M in placentals. Dentition in opossum is I 5/4, C 1/1, P 3/3, M 4/4. 


So, the correct option is 'Option A'.

Uvula is part of

biology coordination in life processes buccal cavity digestive system - organs coordination in the process of digestion

  1. Tongue

  2. Soft palate

  3. Hard palate

  4. Epiglottis

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Correct Option: B

Uvula can close the opening of

biology coordination in life processes buccal cavity digestive system - organs coordination in the process of digestion

  1. Larynx

  2. Gullet

  3. Internal nares

  4. Eustachian tubes

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Correct Option: C

The exchange of respiratory gases occur by the .................  in the plants.

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. air pores

  2. stomata

  3. lenticels

  4. diffusion

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Correct Option: A

Respiratory roots are known as

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. velamen

  2. pneumatophores

  3. hydathodes

  4. prop roots

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Correct Option: B

Roots-respire through.

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. Stomata

  2. Lenticels

  3. Spiracles

  4. Air spaces

Show answer
Correct Option: D
Explanation:

  • The roots of a plant take up air from the spaces between the soil particles.
  • Root hairs are in contact with the air in the soil particles. 
  • Oxygen from the air in soil particles diffuse into root hair and reach all the cells of the root where it is utilised in respiration. Hence, roots respire through air spaces.
So, the correct answer is 'air spaces'.

If you dip a sack full of paddy seeds in water over night and then keep it out for a couple of days, it feels warm. What generates this heat?

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. Imbibition

  2. Exothermic reaction between water and seed coats

  3. Friction among seeds due to swelling

  4. Respiration

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Correct Option: D

Cyanide resistant respiration is found in

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. Plants

  2. Bacteria

  3. Viruses

  4. Animals

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Correct Option: A

Which of the following structures helps in the absorption of water from the soil?

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. Root hair

  2. Root tip

  3. Stomata

  4. None of the above

Show answer
Correct Option: A
Explanation:

While plants can absorb water from many sources the best place for this is the root system which is in contact with the soil where most of the water is found. The root system is usually extensive and has root hairs which help increase the surface area for water absorption. Water enters the root hair cells and then moves from cell to cell till it reaches the root cortex it goes on to the xylem vessels to be transported to the leaves.

So, the correct option is 'Root hair'.

C6H12O6 + 6O2 → 6CO2 + 6H2O+ ATP
The given equation indicates which of the following activities in plants?

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. Digestion

  2. Respiration

  3. Transpiration

  4. None of the above

Show answer
Correct Option: B
Explanation:

Aerobic respiration takes place in the mitochondria and requires oxygen and glucose, and produces carbon dioxide, water, and energy. The chemical equation is 

C6H12O6 + 6O2 → 6CO2 + 6H2O+ ATP (glucose + oxygen -> carbon dioxide + water + ATP).
So, the correct option is 'Respiration'.