Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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

Identify typical dental formula of a metatherian.

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Respiratory roots are known as

  1. velamen

  2. pneumatophores

  3. hydathodes

  4. prop roots
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pneumatophores are specialized roots that grow upwards against gravity to facilitate gas exchange in waterlogged or swampy soil. Velamen is a spongy tissue in epiphytic roots, hydathodes are involved in guttation, and prop roots provide structural support.

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

Roots-respire through.

  1. Stomata

  2. Lenticels

  3. Spiracles

  4. Air spaces
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

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?

  1. Imbibition

  2. Exothermic reaction between water and seed coats

  3. Friction among seeds due to swelling

  4. Respiration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Seeds are living organisms that continue to respire even when dormant. Respiration is an exothermic process that releases energy in the form of heat, which causes the temperature increase observed in the sack.

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

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

  1. Root hair

  2. Root tip

  3. Stomata

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. Digestion

  2. Respiration

  3. Transpiration

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.