Case Study Questions Class 7 Science Chapter 10 Respiration in Organisms
CBSE Class 7 Case Study Questions Science Respiration in Organisms. Important Case Study Questions for Class 7 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Respiration in Organisms.
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CBSE Case Study Questions Class 7 Science Respiration in Organisms
Case study 1
A cell is the smallest structural and functional unit of an organism. Each cell of an organism performs certain functions such as nutrition, transport, excretion and reproduction. To perform these functions, the cell needs energy. Even when we are eating, sleeping or reading we require energy. The food has stored energy, which is released during respiration.Therefore, all living organisms respire to get energy from food. During breathing, we breathe in air.
Air contains oxygen. We breathe out air which is rich in carbon dioxide. The air we breathe in is transported to all parts of the body and ultimately to each cell. In the cells, oxygen in the air helps in the breakdown of food. The process of breakdown of food in the cell with the release of energy is called cellular respiration. Cellular respiration takes place in the cells of all organisms. In the cell, the food (glucose) is broken down into carbon dioxide and water using oxygen. When breakdown of glucose occurs with the use of oxygen it is called aerobic respiration. Food can also be broken down, without using oxygen. This is called anaerobic respiration. Breakdown of food releases energy.
Que. 1) What is the smallest structural and functional unit of an organism?
(a) Tissue
(b) Organ
(c) Cell
(d) All of the above
Que. 2) All living organisms derive their energy form which of the following?
(a) Carbon
(b) Nutrient
(c) Food
(d) None
Que. 3) The breakdown of glucose in the presence of oxygen is called as…………………………………………………………………………………………………..
(a) Aerobic respiration.
(b) Anaerobic respiration.
(c) Respiration.
(d) All of the above.
Que. 4) What is cellular respiration?
Que. 5) What is the function performed by each cell of the organisms?
Answer Key
Que. 1)(c) Cell.
Que. 2) (c) Food.
Que. 3) (a) Aerobic respiration.
Que. 4) Answer: The process of breakdown of food or breakdown of complex food particle into simpler form with the release of energy within the cell is called as cellular respiration.
Que. 5) Answer: The function performed by each cell are: Nutrition, absorption of food, transport, excretion of waste materials and reproduction etc.
Case study 2
Our muscle cells can also respireanaerobically, but only for a short time,when there is a temporary deficiency ofoxygen. During heavy exercise, fast
running, cycling, walking formany hours or heavy weight lifting, the
Demand for energy is high. But thesupply of oxygen to produce the energy
Is limited. Then anaerobic respirationtakes places in the muscle cells to fulfil
The demand of energy:
Glucose ____ (in muscle) in the absence of oxygen______>lactic acid + energy
The cramps occur when muscle cells respire anaerobically. The partial breakdown of glucose produces lactic acid. The accumulation of lactic acid causes muscle cramps. We get relief from cramps after ahot water bath or a massage. Hot water bath or massage improves circulation of blood.As a result, the supply of oxygen to themuscle cells increases. The increase in
the supply of oxygen results in thecomplete breakdown of lactic acid into
carbon dioxide and water.
Que. 1) Can muscle cells respire anaerobically?
(a) True
(b) False
(c) None
Que. 2) Which substance causes muscle cramps during strenuous workout or any other hardcore training?
(a) Lactose acid
(b) Glucose
(c) Lactic acid
(d) None
Que. 3) We get relief form cramps after………………………..……………………………………………..………………………and………………………………………………………………………………………….
(a) Hot water bath and massage.
(b) Cold water bath.
(c) Massage.
(d) All of the above.
Que. 4) When is the demand of energy is high in human body?
Que. 5) How is lactic acid broken down?
Answer Key
Que. 1)(a) True.
Que. 2)(c) Lactic acid.
Que. 3) (a) Hot water bath and massage.
Que. 4) Answer: The demand of energy is high in the human body when the body put into a lot of physical stress like walking, hiking, cycling, swimming, and running.
Que. 5) Answer: When the supply of oxygen is increased the lactic acid is broken down into carbon dioxide and water.
Case study 3
Breathing means taking in air rich in oxygen and giving out air rich incarbon dioxide with the help of respiratory organs. The taking in of airrich in oxygen into the body is called inhalation and giving out of air rich in carbon dioxide is known as exhalation. It is a continuous process which goes on all the time and throughout the life of an organism.The number of times a personbreathes in a minute is termed as thebreathing rate. During breathing inhalation and exhalation take place alternately.
A breath means one inhalation plus one exhalation On an average, an adult human being at rest breathes in and out 15–18 times in a minute. During heavy exercise, the breathing rate can increase upto 25 times per minute. While we exercise, not only do we breathe fast, we also take deep breaths and thus inhale more oxygen
Que. 1) Breathing means taking in air rich in…………………………………………………………………………………..and giving out…………………………………………………………………………with the help of lungs.
(a) Co2 and O2
(b) O2 and Co2
(c) N2 and C2
(d) None
Que. 2) How much a normal human being breathe during rest?
(a) 15-18 times
(b) 65 times
(c) 100 times
(d) 120 times
Que. 3) What is the breathing rate during heavy exercise?
(a) 30 times
(b) 40 times
(c) 25 times
(d) 100 times
Que. 4) Define inhalation and exhalation?
Que. 5) Define breathing rate?
Answer Key
Que. 1) (b) O2 and Co2.
Que. 2) (a) 15-18 times.
Que. 3) (c) 25 times.
Que. 4) Answer: The intake of air rich in oxygen is called as inhalation and the giving out of air rich in carbon dioxide is called as exhalation.
Que. 5) Answer: Breathing rate is defined as the number of times a person breaths per minute.
Case study 4
Normally we take in air through our nostrils. When we inhaleair, it passes through our nostrils into the nasal cavity. From the nasal cavity,the air reaches our lungs through the windpipe. Lungs are present in the chest cavity. This cavity is surrounded by ribs on the sides. A large, muscular sheet called diaphragm forms the floor of the chest cavity. Breathing involves the movement of the diaphragm and the rib cage. During inhalation, ribs move up andoutwards and diaphragm moves down. This movement increases space in ourchest cavity and air rushes into the lungs. The lungs get filled with air. During exhalation, ribs move down and inwards, while diaphragm moves up to its former position. This reduces the size of the chest cavity and air is pushed out of the lungs Smoking damages lungs. Smoking is also linked to cancer. It must be avoided.
Que. 1) From where does we take in air normally?
(a) Nose
(b) Lungs
(c) Nostrils
(d) None
Que. 2) What is leads to lung cancer?
(a) Smoking
(b) Alcohol
(c) Pollution
(d) All of the above
Que. 3) Where are the lungs present?
(a) Buccal cavity
(b) Chest cavity
(c) Lumen
(d) Heart
Que. 4)During inhalation how does the ribs move?
Que. 5) Who forms the floor of the chest cavity?
Answer Key
Que. 1) (c) Nostrils.
Que. 2) (a) Smoking.
Que. 3) (b) Chest cavity
Que. 4) Answer: During inhalation the ribs move in upwards and outward directions.
Que. 5) Answer: Diaphragm forms the floor of the chest cavity which is a large muscular sheet.
Case study 5
Animals such as elephants, lions, cows, goats, frogs, lizards, snakes, birds, have lungs in their chest cavities like the human beings. Cockroach: A cockroach has small openings on the sides of its body. Other insects also have similar openings. These openings are called spiracles. Insects have a network of air tubes called tracheae for gas exchange. Oxygen rich air rushes through spiracles into the tracheal tubes, diffuses into the body tissue, and reaches every cell of the body.
Similarly, carbon dioxide from the cells goes into the tracheal tubes and moves out through spiracles. These air tubes or tracheae are found only in insects and not in any other group of animals. The skin of an earthworm feels moist and slimy on touching. Gases can easily pass through them. Though frogs have a pair of lungs like human beings, they can also breathe through their skin, which is moist and slippery.
Que. 1) Which of the following animal have lungs like human beings?
(a) Cows
(b) Goat
(c) Snakes
(d) All of the above
Que. 2) The trachea is found only in the……………………………………………………………………………………… and no other group of animals.
(a) Insect
(b) Pest
(c) Cow
(d) Snake
Que. 3)…………………………………………………..………………………….. organism can breathe through their skin.
(a) Snake
(b) Reptiles
(c) Birds
(d) Frog
Que. 4) What are the small openings on the sides of cockroach’s body?
Que. 5) How does the skin of earthworms feel on touching?
Answer Key
Que. 1)(d) All of the above.
Que. 2)(a) Insect.
Que. 3) (d) Frog.
Que. 4) Answer: The small opening on the sides of a cockroach’s body is called as spiracle.
Que. 5) Answer: one touching the skin of the earthworm one would feel it moist and slimy.
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