Quiz

Question: Smoking mainly damages which of the following organs?
Options:
A.Kidney
B.Brain
C.Lungs  
D.Liver 
Answer: Option C
: C

Lungs get seriously damaged by smoking. Cigarette smoke contains chemicals such as tar and nicotine which heavily damage the alveoli. Long term smoking also increases the riskof cardiovascular diseases.

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More Questions on This Topic :

Question 1. Our body needs food to produce ______.
  1.    carbon dioxde
  2.    water   
  3.    energy
  4.    oxygen 
Answer: Option C
: C

The food we eat is digested into smaller particles. The nutrients like carbohydrates, proteins, fats, vitamins and minerals are absorbed into the blood which transports it to all parts of the body. Of these nutrients,glucose is taken up by cells and broken down to produce carbon dioxide and water with the release of energy. This energy is used to carry out all life processes. Carbon dioxide that is produced during this process is expelled out of the body during exhalation.
Question 2. Roots take up air
from air spaces present between soil particles.
  1.    True
  2.    False
  3.    breathing
  4.    respiration
Answer: Option A
: A

In plants, each part can independently take in oxygen from the air and give out carbon dioxide. Like all other living cells of the plants, the root cells take up air from the air spaces present between the soil particles.
Question 3. Lactic acid produced during anaerobic respiration can be broken down completely when ________ is supplied.
  1.    carbon dioxide
  2.    water
  3.    glucose
  4.    oxygen
Answer: Option D
: D

During anaerobic respiration, lactic acid is produced. This happens when the demand for energy is more and supply of oxygen is less, mainly during heavy exercise. The lactic acid thus formed is broken down by the supply of oxygen.

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