Respiratory System — Biology

Home › PYQ Plus › Biology › Respiratory System

Respiratory System

2 questions

All (2) Unattempted (2) Skipped (0) Correct (0) Wrong (0)

Q.1

Based on: WBCS Prelims 2018

Which marine mammal is known to have the longest recorded dive duration, capable of breath-holds exceeding 90 minutes?

A. Bottlenose dolphin

B. Humpback whale

C. Sperm whale

D. Blue whale

Explanation

Why Correct: Sperm whales possess the highest myoglobin concentrations among cetaceans and reinforced airways, enabling dives lasting over 90 minutes to hunt giant squid in deep ocean waters.
Distractor Analysis: Bottlenose dolphins typically dive for 8-10 minutes, though some records reach 12 minutes. Humpback whales usually dive for 15-20 minutes during feeding migrations. Blue whales, despite having the largest lungs, typically dive for 10-20 minutes while feeding on krill.
Takeaway: Cuvier's beaked whale holds the current mammalian dive record at approximately 138 minutes, surpassing even sperm whales in extreme dive capability.

Answer or skip previous question to unlock.

Q.2

Based on: WBCS Prelims 2013

In the human respiratory system, the primary passages that carry air from the trachea to the lungs are called:

A. Bronchioles

B. Branchiostegite

C. Bronchi

D. Alveoli

Explanation

Why Correct: Bronchi are the two main branches of the trachea that conduct air into the left and right lungs. Each bronchus divides into smaller bronchioles.
Distractor Analysis: Bronchioles are smaller airways branching from bronchi, not the primary passages. Branchiostegite is a crustacean gill cover, not a human structure. Alveoli are the tiny air sacs where gas exchange occurs, not conducting passages.
Takeaway: The trachea divides into left and right primary bronchi at the level of the sternal angle (T4/T5). Each bronchus then branches into secondary and tertiary bronchi before forming bronchioles.

Sign in to Papersetters