CBSE Class 7 Science Respiration in Organisms Worksheet with Solution by Expert Science Mam. Students of 7th Grade can solve this worksheet for extra preparation before exam. Private Teacher or Guardians of the Students can copy all the questions of this chapter and will match after solve their students.
Respiration in Organisms Class 7 Worksheet
Worksheet for Chapter No.10): – Respiration in Organisms
The following questions are important for your exams for 1 mark 2 mark or 5 marks. First solve the questions on your own and then saw the solution for understanding it better.
Practice worksheet for class 7
Section A
Q 1.) Define cellular organisms and where it takes place ?
→ The process of breakdown of food in the cell with the release of energy is called cellular respiration. The cellular respiration takes place in the cells of all organisms.
Q 2.) Write the types of cellular respiration ?
→ The cellular respiration is of two types :-
1.) Aerobic respiration
2.) Anaerobic respiration
Q.3.) Define anaerobes give example ?
→ The organisms that can survive in the absence of air called as anaerobes.
Example – Yeast.
Q.4.) Differentiate between aerobic respiration in muscles cells and yeast ?
→ The difference between anaerobic respiration in muscle cells and that in Yeast are as follows:-
Anaerobic Respiration in Muscle cell |
Anaerobic Respiration in yeast |
Occurs in insufficient supply of air |
Occurs in insufficient or absence of air |
Produces Lactic Acid |
Produces Ethanol |
It can cause muscle cramps |
It causes fermentation of sugar – rich substances to alcohol |
Q.5.) Write the composition of inhaled and exhaled air?
→ 1.) The composition of air is :- the oxygen content of inhale air is 21% and the carbon dioxide content is 0.04%.
2.) Exhaled air has 16.4% of Oxygen and 4.4% of carbon dioxide in it.
Q.6.) Write the difference between inhalation and exhalation?
→
Inhalation |
Exhalation |
The intake of air from the environment into the body |
Air is expelled from the body and into the environment |
The oxygen content of inhaled air is high |
Carbon dioxide is abundant in exhaled air |
The rib cage rises upwards and outwards during inhaling |
Exhalation causes the rib cage to shift inward and downward |
The diaphragm contracts and flattens during inhaling |
The diaphragm relaxes and returns to a dome from during exhale |
Q.7.) What is the difference between respiration and breathing?
→ Breathing is the process of inhalation and acceleration air by the organs design for gaseous exchange while respiration is entire process of gases exchange occurring at the cellular level.
Q.8.) Why does an athlete breath faster during running?
→ Athlete needs to supply extra energy to his muscle cells which have worked hard during running. for this he breaths faster and deeper, so that more oxygen is supplied to the cells these splits up The breakdown of food and other result more energy is released.
Q.9.) State the difference between aerobic respiration and anaerobic respiration .
Aerobic respiration |
Anaerobic respiration |
It is the process of breakdown of food in the presence of oxygen. |
It is the process of breakdown of food in the absence of oxygen. |
Its end products are CO2 and H2O. |
End products of anaerobic respiration can be lactic acid or CO2 and alcohol. |
It takes longer time to release energy. |
It is a fast process as compared to aerobic respiration. |
It produces large amount of energy. |
It produces small amount of energy as compared to aerobic respiration. |
Examples: It occurs in most plants and animals. |
Examples : Yeast, bacteria, human muscle cells, etc. respire anaerobically. |
Q.10.) What is the organ for breathing in humans and fishes?
→ In humans , breathing is done with the help of lungs and In dishes it is done with the help of gills.
Q.11.) Define the term diffusion ?
→ Diffusion is the process of movement of molecules from the area of its lower concentration to the area of its higher concentration without application of energy.
Q.12.) Write the components of respiratory system in humans?
1.) Nasal Chamber
2.) Pharynx
3.) Larynx
4.) Trachea
5.) Bronchi
6.) Lungs
7.) Diaphragm
Q.13.) How does breathing takes place in earthworm?
→ The skin of an earthworm feels moist and slimy on touching. Gases can easily pass through them. Han’s earthworm respires through their skin.
Q.14.) How does cockroach breathe ?
→ Cockroach has small openings on the sides of its body these openings are called spiracles. Insects have a network of air tubes called trachea for gas exchange. Oxygen reach air rushes through spiracles into the tracheal tubes diffuses into the body tissue and reaches every cell of the body.
Q.15.) How our respiration system protects from inhaling unwanted particles from the air ?
→ The air around us has types of unwanted particle like smoke, dust, and pollens . When we inhale the particles get trapped in the hair present in our nasal cavity. Sometimes this particle may get past the hair in the nasal cavity. This may irritate the lining of cavity as a result of which we sneeze.
Q.16.) What is the rate of breathing in adult human being ?
1.) An adult human being breathes in an out 15 to 18 times in a minute.
2.) During heavy exercise the breathing rate can increases up to 25 times per minute. While we exercise not only do we breathe fast we also take deep breathes and does inhale more oxygen.
Q 17.) What is breathing rate?
→ The number of times a person breeds in a minute each termed as breathing rate. During breathing inhalation and exhalation takes place alternately.
Q.18.) What is cellular respiration ?
→ Cellular respiration is a set of metabolic reactions occurring inside the cells to convert biochemical energy obtained from food into chemical compound called adenosine triphosphate. Metabolism refers to chemical reactions carried out for maintaining the living state of cells in an organism.
Q.19.) What is metabolism and define ATP ?
→ Metabolism refers to a set of chemical reactions carried out for maintaining the living state of cells in an organism this can be divided into two categories.
1.) Catabolism- the process of breaking molecules to obtain energy.
2.) Anabolism – the process of synthesizing all compounds required by the cells.
ATP is at innocence triphosphate is the energy currency of cells. It is produced during cellular respiration and utilized for various endergonic process.
Q.20.) Why do we respire ?
1.) Every living organism requires energy for its survival. Even when we are eating or sleeping, we need energy.
2.) The energy comes from food and it is the process of respiration that Converts the food into energy.
3.) While breathing we breathe in air that contains Oxygen and we breathe out air reach in carbon dioxide.
4.) As we breathe the oxygen reach air transported to all parts of our body and ultimately to each cell
5.) Inside the cell the food present in the form of glucose broken down into carbon dioxide and water with the help of oxygen. The process of breakdown of glucose to release energy which can be utilized by our body to perform daily activities like walking sitting or even thinking it is known as respiration.