Respiration & Gas Exchange Quiz

Plants also respire to survive and take in oxygen by the following structures except:

1. Lenticels
2. Mesophyll cells
3. Roots
4. Stomata

Answer: (b) Mesophyll cells

Select the option that correctly matches the structure i, ii , and iii with their common names and description. Structure Common Name Description A Alveoli Air sacs Tiny sacs where gas exchange occurs B Bronchi Windpipe Primary airway leading to the lungs C Trachea Voice box Connects the throat to the lungs D Epiglottis Windpipe Prevents food and liquid from entering the airway

1. A
2. B
3. C
4. D

Answer: (a) A

Thomas has been overwatering his plants in the hopes of promoting better growth, but he discovered that the plants died after a few weeks. What could be the most likely reasons for his plants’ death?

1. Amount of oxygen available to the plant's roots is reduced
2. Water is leaking and not available to plants
3. Stomates are unable to transpire too much water
4. Carbon dioxide availability is reduced

Answer: (a) Amount of oxygen available to the plant's roots is reduced

The following equation is associated with the process of respiration in organisms. Which organism is most likely to switch to a different form of respiration when oxygen is absent?

1. Plants
2. Yeast
3. Insects
4. Aquatic animals

Answer: (b) Yeast

When yeast respire in absence of oxygen and break down glucose, the resulting products are valuable for various industries. If yeast respire using oxygen, in which process would it still be useful?

1. Wine production
2. Beer production
3. Baking bread
4. Chocolate production

Answer: (c) Baking bread

Which image correctly represents the gaseous exchange in plants through tiny pores on leaves called stomata?

Answer: (d)

The AQI (Air Quality Index) in a given region has remained elevated for a week, causing many outdoor workers to experience chronic coughing, wheezing, and throat discomfort with prolonged exposure. These symptoms indicate:

1. Inflammation of throat only
2. Inflammation of nasal cavity only
3. Infection in lungs only
4. Irritation and inflammation of the respiratory system

Answer: (d) Irritation and inflammation of the respiratory system

Carefully read through the passage and answer the following questions. Lactic acid accumulation During intense exercise, when oxygen is insufficient, the body switches to anaerobic respiration, converting glucose into lactic acid, which accumulates in muscles. Despite breathing in oxygen, the intake may not meet the demand, creating an oxygen deficit. Anaerobic respiration allows quick ATP production for high-energy activities, such as sprinting, though lactic acid buildup is a waste byproduct. In sports, energy needs are met through two forms of respiration: anaerobic (high-intensity, short-duration) and aerobic (low-intensity, long-duration) exercises. You experience temporary fatigue and muscle cramps during high-intensity workouts but not during low-intensity exercises like walking. Which of the following statements correctly explain why?

1. Demand for energy exceeds the available oxygen while walking.
2. Extra energy is not required during walking.
3. Body can balance the supply of oxygen with the demand for energy during a walk.
4. Sufficient glucose is present in muscles for walk.

Answer: (c) Body can balance the supply of oxygen with the demand for energy during a walk.

Carefully read through the passage and answer the following questions Lactic acid accumulation During intense exercise, when oxygen is insufficient, the body switches to anaerobic respiration, converting glucose into lactic acid, which accumulates in muscles and can lead to cramps and fatigue. Despite breathing in oxygen, the intake may not meet the demand, creating an oxygen deficit. Anaerobic respiration allows quick ATP production for high-energy activities, such as sprinting, though lactic acid buildup is a waste byproduct. In sports, energy needs are met through two forms of respiration: anaerobic (high-intensity, short-duration) and aerobic (low-intensity, long-duration) exercises. Select the correct option regarding the given statements. Statement 1(S1): Fermentation produces ATP rapidly but in smaller amounts compared to aerobic respiration. Statement 2 (S2): It is quick and partial breakdown of glucose.

1. Both the statements are correct and S2 is the correct explanation for S1.
2. S1 is correct but S2 is incorrect.
3. S1 in incorrect but S2 is correct.
4. Both the statements are correct but S2 is not the correct explanation of S1.

Answer: (a) Both the statements are correct and S2 is the correct explanation for S1.

Carefully read through the passage and answer the following questions. Gas exchange in the Lungs Air enters the body through the mouth or nose, moving quickly to the pharynx (throat) and then through the larynx (voice box) into the trachea, a strong tube with cartilage rings that keep it open. The trachea divides into the left and right bronchi, which further branch into smaller bronchioles within the lungs. At the ends of the smallest bronchioles are tiny air sacs called alveoli, which inflate during inhalation and deflate during exhalation. Gas exchange in the lungs involves several steps. First, air moves in and out of the lungs during ventilation. In the alveoli, oxygen diffuses into the capillaries, while carbon dioxide moves from the capillaries into the alveoli, a process that occurs passively. The cardiovascular system, through perfusion, pumps blood throughout the lungs. During exhalation, the body expels carbon dioxide from the alveoli. Finally, oxygen binds to red blood cells, which then return to the heart, carrying oxygen-rich blood throughout the body. Carefully study the given representation of gas exchange in lungs. What is true for letters X and Y.

1. X is always CO2, Y is always O2
2. X is always O2, Y is always CO2
3. X is atmospheric air, Y is CO2
4. X is always O2, Y can be O2 or CO2

Answer: (b) X is always O2, Y is always CO2