Worksheets With Solutions: Respiration in Organisms Class 7 Worksheet Science Chapter 6

Section A: Multiple Choice Questions

Correct Answer is Option (d)
The heart is not a respiratory organ, it is a muscular organ that pumps blood throughout the body.

Q.2. During aerobic respiration, what is the final waste product?
(a) Carbon dioxide
(b) Water
(c) Lactic acid
(d) Ethanol

Correct Answer is Option (b)

During aerobic respiration, glucose is broken down in the presence of oxygen to produce energy, carbon dioxide, and water.

Q.3. Which of the following is NOT a function of the respiratory system in humans?
(a) Gas exchange
(b) Regulation of blood pH
(c) Production of red blood cells
(d) Sense of smell

Correct Answer is Option (c)
Red blood cells are produced in the bone marrow, not in the respiratory system.

Q.4. In which type of respiration is oxygen not required?
(a) Aerobic respiration
(b) Anaerobic respiration
(c) Photosynthesis
(d) None of the above

Correct Answer is Option (b)
Anaerobic respiration does not require oxygen and occurs in the absence of oxygen.

Q.5. Which of the following is NOT a respiratory structure in plants?
(a) Stomata
(b) Lenticels
(c) Roots
(d) Leaves

Correct Answer is Option (c)
 Roots do not play a role in the respiratory system of plants. Stomata, lenticels, and leaves are all respiratory structures in plants.

Section B: Short Questions

Respiration is the process by which organisms exchange gases with the environment. It involves the uptake of oxygen and release of carbon dioxide.

Q.2. What is the difference between aerobic and anaerobic respiration?

Aerobic respiration requires oxygen and occurs in the presence of oxygen. Anaerobic respiration does not require oxygen and occurs in the absence of oxygen.

Q.3. How does the respiratory system in humans help regulate blood pH?

The respiratory system in humans helps regulate blood pH by controlling the amount of carbon dioxide in the blood. When carbon dioxide levels increase, the respiratory system increases breathing rate to remove excess carbon dioxide.

Q.4. What is the function of stomata in plants?

Stomata are small openings on the surface of leaves that allow for gas exchange in plants. They allow for the uptake of carbon dioxide and release of oxygen during photosynthesis, as well as the release of oxygen and uptake of carbon dioxide during respiration.

Q.5. What is the role of gills in aquatic animals?

Gills in aquatic animals are respiratory structures that allow for gas exchange between the animal and the water. They extract oxygen from the water and release carbon dioxide, allowing the animal to breathe underwater.

Section C: Fill in the Blanks

The process of breathing in oxygen and breathing out carbon dioxide is called respiration.

Q.2. The respiratory system in humans consists of the  ______,  ______,  _______, _____, and  _______.

The respiratory system in humans consists of the nose, pharynx, larynx, trachea, and lungs.
(i) The nose is the primary organ of the respiratory system that warms, moistens, and filters the air we breathe in.
(ii) The pharynx is a muscular tube that connects the nasal cavity to the larynx and helps in swallowing.
(iii) The larynx is commonly known as the voice box and plays a crucial role in speech production.
(iv) The trachea, also known as the windpipe, is a tube that carries the air from the larynx to the lungs.
(v) The lungs are the primary organs of respiration where the exchange of gases occurs.

Q.3. The process of breaking down glucose to release energy in the absence of oxygen is called ______ respiration.

The process of breaking down glucose to release energy in the absence of oxygen is called anaerobic respiration.

Q.4. The process of breaking down glucose to release energy in the presence of oxygen is called _______ respiration.

The process of breaking down glucose to release energy in the presence of oxygen is called aerobic respiration.

Q.5. The respiratory system in plants takes place through tiny openings on the surface called _______.

The respiratory system in plants takes place through tiny openings on the surface called stomata.
Stomata are present on the leaves, stems, and other parts of the plant and allow for the exchange of gases, including oxygen and carbon dioxide.

Section D: Match the Column

1. The organs in the chest that are responsible for breathing. The lungs are the primary organs of the respiratory system, responsible for taking in oxygen and expelling carbon dioxide.

2. A large airway that leads to the lungs. The trachea, also known as the windpipe, is a tube that connects the larynx (voice box) to the bronchi of the lungs.

3. Two tubes that branch off from the trachea and lead to each lung. The bronchi are the main airways that lead from the trachea to each lung, where they further divide into smaller bronchioles.

4. A muscular organ that pumps blood throughout the body. The heart is a vital organ of the circulatory system, responsible for pumping blood to all parts of the body.

5. The process of breathing in oxygen and breathing out carbon dioxide. Respiration refers to the exchange of gases (oxygen and carbon dioxide) between the body and the environment, which occurs through breathing.

Section E: True or False

True

The respiratory system varies across different animal species, depending on their specific needs and adaptations. For example, fish have gills for breathing underwater, while birds have air sacs that help them extract oxygen more efficiently at high altitudes.

Q.2. The process of respiration takes place only in animals.

False
Respiration is a fundamental process that occurs in all living organisms, including plants, animals, and even bacteria. It involves the exchange of gases, typically oxygen and carbon dioxide, with the environment.

Q.3. Plants also have a respiratory system. 

True
Plants also have a respiratory system, which involves the uptake of oxygen through small pores called stomata and the release of carbon dioxide during photosynthesis. However, plants do not have lungs like animals do.

Q.4. Aerobic respiration requires oxygen, while anaerobic respiration does not.

True
Aerobic respiration is the process by which cells use oxygen to break down glucose and produce energy in the form of ATP. Anaerobic respiration, on the other hand, occurs in the absence of oxygen and is less efficient, producing less ATP and some byproducts like lactic acid.

Q.5. The respiratory system in humans consists of the nose, trachea, lungs, and liver. 

False
The respiratory system in humans consists of several organs, including the nose, pharynx, larynx, trachea, bronchi, bronchioles, and lungs. The liver is not part of the respiratory system but plays an important role in metabolism and detoxification.