CBSE Class 7 Science Respiration in Organisms Assignment

Question. In the arrangement shown, which of the following substances will make lime water turn milky when kept in the round-bottomed flask for a few days? 

a) damp boiled rice
b) dry wood pieces
c) roasted peanuts
d) charcoal

Answer : A

Question. Study the model shown here. It is made from a cut plastic bottle, 2 balloons, a tube, a stopper and a cut balloon. This model corresponds to the human lung model as shown. What will happen when the stretched band is pulled downwards?

a) the balloons will expand
b) the balloons will contract
c) the balloons will be unchanged
d) the bottle will contract

Answer : A

Question. Which among the following is not an organ system in the human body?
a) Digestive system
b) Respiratory system
c) Brain system
d) Circulatory system

Answer : C

Question. The organ shown here is a part of which of these organ systems?

a) Nervous System
b) Respiratory System
c) Digestive System
d) None of these

Answer : B

Question. In the figure given of the human lungs, which arrow points to the bronchioles?

a) A
b) B
c) C
d) D

Answer : B

Question. Presence of carbon dioxide turns limewater milky. Applying this fact and observing the following chart, identify the correct statement below.

a) Sample 2 contains more carbon dioxide than sample 3.
b) Sample 3 contains more carbon dioxide than sample 1.
c) Sample 1 and 2 both contain carbon dioxide.
d) Sample 4 does not contain carbon dioxide.

Answer : D

Question. Blood glucose levels are expressed in terms of mass per unit volume. Which of the following would be the MOST appropriate unit to measure blood glucose level?
a) gram/decimetre
b) micron/degrees C
c) litre/gram
d) milligram/decilitre

Answer : D

Question. The blood pressure in various arteries and veins in the body is not the same. The pressure is higher in arteries closer to the heart and lower in veins which are far away from the heart. This is shown in the graph here. Which of these statements is likely to be correct about these types of blood vessels?

a) Blood will flow out fastest if a LARGE VEIN is accidentally cut.
b) LARGE ARTERIES will have the thickest and most muscular walls.
c) When the blood leaves the heart, it first enters CAPILLARIES.
d) A SMALL ARTERY is likely to get divided into many LARGE ARTERIES.

Answer : B

Question. Which of these does NOT affect the amount we sweat?
a) Surrounding temperature
b) Surrounding humidity
c) Individual characteristics
d) Amount of water we drink

Answer : D

Question. The chamber of the heart that has the thickest muscles is one that_______.
a) pumps oxygenated blood to all parts of the body..
b) pumps deoxygenated blood to the lungs
c) receives oxygenated blood from the lungs.
d) receives deoxygenated blood from all parts of the body

Answer : A

Question. Given below is a diagrammatic representation of a process taking place in a specific region of the human body. Which region/organ is this?

a) The heart
b) The lungs
c) The liver
d) Bones

Answer : B

Question. Which of these units could blood flow be expressed in?
The question is related to this table showing the amount of blood flowing through the various organs at different times in the human body (in appropriate units.)

a) litres per kilogram
b) millilitres per minute
c) metres per second
d) seconds per cubic centimetre

Answer : B

Question. What can be concluded from the given data?
The question is related to this table showing the amount of blood flowing through the various organs at different times in the human body (in appropriate units.)

a) The total volume of blood in the human body increases during strenuous exercise.
b) The blood flow in different organs changes in response to the changing needs of the body.
c) The kidneys and some other organs stop functioning during strenuous exercise.
d) Anything which increases blood flow to various parts of the body is harmful.

Answer : B

Question. Shown here is the set up for an experiment in which plants were planted in 2 pots, watered regularly and observed after 2 days. What can you answer from the above experimental results?

a) Can plants grow in bottles?
b) Can we grow plants in water alone?
c) What is the function of the roots of a plant?
d) Can we grow a plant without roots?

Answer : D

Question. In the representation of the circulatory system below, identify the artery that carries deoxygenated blood.

a) A
b) B
c) C
d) D

Answer : A
 

Q.1 Fill in the blanks :

1. The process of breaking down of food in the cell with the release of energy is called _______________ respiration. (Cellular / Anaerobic)

2. The taking in of air rich in exygen into the body is called ________________. (Inhalation / Exhalation).

3. The openings in a cockroach’s body through which it takes in air in its body for respiration are called ________________. (Nostrils / Spiracles)

4. The large muscular sheet which forms the floor of the chest cavity is called ____________. (Diaphragm / Lungs).

5. The number of times a person breathes in a minute is termed as the _______________ rate. (Breathing / Running)

Q.2 Correct the following statements by replacing the highlighted word :

1. Lungs are located in the buccal cavity : (Chest / Nasal)

Ans. ______________________________________________________________

2. The type of respiration in which food is broken down without the use of oxygen is called aerobic respiration. (Cellular / Anaerobic)

Ans. ______________________________________________________________

3. Humans are anaerobes. (Yeast / Dogs)

Ans. ______________________________________________________________

4. Yeast respires anaerobically and yields water. (Fruit Juice / Alcohol)

Ans. ______________________________________________________________

5. When we feel drowsy, our breathing rate increases. (Remains same / Slows Down)

Ans. ______________________________________________________________

Q.3. Match the following :

            Column I                                         Column II

1. Glucose (with oxygen)              a. 21% Oxygen, 0.04% Carbon Dioxide

2. Glucose (Without Oxygen)       b. 16.4% Oxygen, 4.4% Carbon Dioxide

3. Glucose in muscles (In the       c. Carbon Dioxide + water + energy absence of oxygen)
4. Inhaled air                                d. Carbon Dioxide + Alcohol + Energy
5. Exhaled air                               e. Lactic acid + Energy