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Practice MCQ Questions and answers on Biology-GK

Learn and practice General Knowledge questions and answers on Biology with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-8 section-8

Each section contains 100 MCQs on Biology .
71
At the time of inspiration the diaphragm
Discuss
Answer & Solution
Answer: Option B
Solution:
When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.
72
Rate of breathing in a minute by man is
Discuss
Answer & Solution
Answer: Option A
Solution:
A normal breathing rate for an adult at rest is 8 to 16 breaths per minute.
73
The C shape of the tracheal cartilage is important because
Discuss
Answer & Solution
Answer: Option B
Solution:
The cartilaginous rings are C-shaped to allow the trachea to collapse slightly at the opening so that food can pass down the esophagus.
74
Alveoli is related to which of the following system of human body?
Discuss
Answer & Solution
Answer: Option D
Solution:
Alveoli are tiny air sacs in your lungs that take up the oxygen you breathe in and keep your body going. Although they're microscopic, alveoli are the workhorses of your respiratory system.
75
Complete oxidation of sucrose in presence of oxygen into CO2, water and energy is called
Discuss
Answer & Solution
Answer: Option A
Solution:
Aerobic respiration takes place in the presence of oxygen and finally degrades glucose to carbon dioxide and water with release of energy in form of ATP.
So, the correct answer is option A.
76
When the diaphragm and external intercostal muscles contract,
Discuss
Answer & Solution
Answer: Option C
Solution:
When the diaphragm and external intercostal muscles contract, the volume of the thorax increases.
77
Blood leaving lungs, is rich in
Discuss
Answer & Solution
Answer: Option A
Solution:
Blood leaving lungs, is rich in oxygen.
78
The organs protected by the thoracic cage include the
Discuss
Answer & Solution
Answer: Option C
Solution:
The thoracic cage encloses and protects the organs of the thoracic cavity, including the heart and lungs.
79
By complete oxidation of glucose number of ATP molecule formed is
Discuss
Answer & Solution
Answer: Option C
Solution:
By complete oxidation of glucose number of ATP molecule formed is 38.
80
If CO2 concentration in the blood increases, the breathing will
Discuss
Answer & Solution
Answer: Option A
Solution:
When CO2 concentration in blood increases, breathing becomes faster and deeper.