Gaseous Exchange

Q.

What is the pathway of oxygen to the lungs?

Q. Name the organs of breathing in fish.

Q.

The small pores on the surface of the stems and roots are called _____.

1. root caps

2. stomata

3. lenticels

4. stem pores

Q. Assertion: $\text{C}{\text{O}}_2$ diffuses only from tissue to alveoli and not in the reverse direction.
Reason: $\text{C}{\text{O}}_2$ is 10 times more soluble than ${\text{O}}_2$.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not a correct explanation of A
3. A is true but R is false
4. A and R are false

Q. RQ of germinating Pisum sativum seed is ____.

1. Zero
2. Unity
3. More than unity
4. Less than unity

Q. The exchange of gases in plants is mainly through ______.

1. stalk
2. pedicel
3. stomata
4. flowers

Q.

The valve present between the right atrium and right ventricle is called

1. Bicuspid valve

2. Mitral valve

3. Semilunar valve

4. Tricuspid valve

Q. What do alveoli, villi and nephrons have in common? Give 2 points

Q.

Give scientific reasons for the following statements:

Blood flows in arteries in spurts and is under pressure.

Q. Exchange of gases between the blood and the tissues of the body takes place by .

1. osmosis
2. diffusion
3. active transport
4. absorption

Q.

The capillaries around the air sacs take in ___and give off___.

Q.

The following circulating system contains colourless fluid, bathes all the tissues and has white blood cells

1. Systemic

2. Pulmonary

3. Blood groups

4. Lymphatic

Q.

Mark the odd one in each of the following series
(i) Purkinje fibers, AV bundle, AV valve, SA node.
(ii) Mitral valve, tricuspid valve, semilunar valve, venous valve.
(iii) Thoracic duct, aorta, pulmonary vein, vena cava.

Q. Sort the steps involved in energy production from food.

1. Digestion
2. Krebs Cycle
3. Glycolysis
4. Ingestion
5. Assimilation

Q. When the volume inside the lungs increases, the intrapulmonary pressure.

1. decreases
2. increases
3. equalises

Q.

How are alveoli designed for maximum exchange of gases ?

Q.

Poriferans have holes or pores all over the body that lead to a system that helps in circulating water to bring in food and oxygen. Name the system.

Q.

State the system in poriferans that helps in circulating water throughout the body to bring in food and oxygen.

Q.

What is the function of large number of alveolis?

Q.

Which of the following is the function of the circulatory system?

1. Ferrying oxygen from lungs to cells

2. Transporting carbon dioxide from cells to lungs

3. Delivering nutrients around the body

4. Carrying wastes from cells to excretory system

Q.

Fill in the blanks.

(xiii) During ventricular contraction, ________ prevents the blood from moving from aorta into left ventricle.

Q. The initial portion of the nasal cavity is the _____________, which is lined with stratified squamous epithelium.

1. nostrils
2. nasal vestibule
3. vibrissae
4. utriculus

Q. Identify the structure shown below:

1. Arteries
2. Capillaries
3. Pharynx
4. Alveoli

Q. The major factor affecting the binding of carbon dioxide to hemoglobin is?

Q.

Give scientific reasons for the following statements.

Blood flows in arteries with spurts and high pressure.

Q. Approximate normal composition of alveolar air is?

1. $14\%O_2,6\%C{O}_2,80\%N_2$
2. $16\%O_2,3\%C{O}_2,81\%N_2$
3. $21\%O_2,2\%C{O}_2,77\%N_2$
4. $10\%O_2,8\%C{O}_2,82\%N_2$

Q. What is the approximate normal composition of alveolar air?

1. 21 % oxygen, 2% carbon dioxide, 77% nitrogen
2. 14% oxygen, 6% carbon dioxide, 80% nitrogen
3. 16% oxygen, 3% carbon dioxide, 81 % nitrogen
4. 10% oxygen, 8% carbon dioxide, 82% nitrogen

Q.

Lungs of a man are highly suitable for respiration.why?

Q. Rishabh told his mother that various pipelines transport gases in our body. Based on his view, describe the transport and mechanism's of gases of gases in our body

Q. Membrane separating air in pulmonary alveoli from blood capillaries.

1. Alveolar epithelium
2. Cardiac epithelium
3. Endothelium of blood capillaries
4. Both ${}^{\prime }{1}^{\prime }$ and ${}^{\prime }{3}^{\prime }$