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BIOLOGY
Chapter # 10
GASEOUS EXCHANGE
Subjective Type Question
1. Define cellular respiration?
A process in which C-H bonds in food are broken by oxidation reduction
reactions and the energy is transformed into ATP is known as Cellular
Respiration. Respiration involves the mechanical (physical) and bio-chemical
processes.
C
6
H
12
O
6
+ O
2
CO
2
+H
2
O + Energy (ATP)
2. Define Aerobic Respiration?
In aerobic respiration oxygen is used and there is complete oxidation of the
food material. Carbon dioxide and water are also produced in this process.
3. Define gaseous exchange?
Taking in of oxygen and giving out of carbon dioxide is termed as gaseous
exchange.
4. What is breathing?
The process through which animals take air in their bodies to get Oxygen
from it and then give out the air to get rid of carbon dioxide is known as
Breathing.
OR
The physical movements associated with the gaseous exchange are called
breathing.
Phases of Breathing:
There are two phases of breathing i.e
Inhalation
Exhalation
5. What are Stomata?
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The leaves and young stems have ting pores in epidermis called stomata. The
gaseous exchange occur through these stomata. The inner cells of leaves
(mesophyll) and stem also have air spaces among them, which helps in the
exchange of gases.
6. How does gaseous exchange occur in leaves and young stems?
The leaves and young stems have stomata in their epidermis. The gaseous
exchange occur through these stems. The inner cells of leaves (mesophyll)
and stem also have air spaces among them, which helps in the exchange of
gases. In young stems and leaves, some gaseous exchange also occur through
the Cuticle which is present over their epidermis.
7. What is the function of cuticle?
In young stems and leaves, some gaseous exchange also occur through the
Cuticle which is present over their epidermis.
8. Leaf cells faces two situation write their names?
Leaf cells faces two situations are
Day time
Night time
9. Define day time leaf situation?
During the day time, when Mesophyll cell of leaves are carrying out
photosynthesis and respiration side by side. The oxygen produced in
photosynthesis is utilized in cellular respiration. Similarly, the carbon dioxide
produces during cellular respiration is utilized in photosynthesis.
10. Define night time leaf situation?
During night time, when there is not photosynthesis occurring. The leaf cells
get oxygen from the environment and release carbon dioxide.
11. What are Lenticels? Write their function?
In woody stems and mature roots the entire surface is covered by bark which
is impervious to gases or water. However these are certain pores in the layer
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of bark. These are called the lenticels. The lenticels allow air to pass through
them. Lenticels are slightly more raised than general surface of the stem.
12. How does gaseous exchange occur in young roots?
Gases diffuse in and out of the general surface of the young roots. The gases
are found in the soil surrounding the roots.
13. How does gaseous exchange occurs in aquatic roots?
The aquatic plants get the oxygen dissolved in water and release carbon
dioxide in the water.
14. What are air passage ways write their names?
The parts through which the outside air comes in the lungs and after the
exchange of gases it goes out. This passage of air consists of the following
parts:
Nostrils
Nose
Nasal cavity
Pharynx
Larynx
Trachea
Bronchi
Bronchioles
Alveolar
Alveoli
15. What is nasal cavity?
The nose encloses the nasal cavity. It open to the outside through the
openings called nostrils. The nasal cavity is divide into two portions by a wall.
Each portion is lined by fine hairs and mucus which filter the dust particles
from air. The mucus also moistens and warms the incoming air and keeps its
temperature nearly equal to that body.
16. What are the function of Hair & Mucus in the nose?
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Hair and mucus in the nose filter the dust particles from the air. The mucus
also moisten and warms the incoming air and keeps its temperature nearly
equal to that body.
17. What are the role of pharynx in respiration?
The nasal cavity opens into the pharynx by means of two small openings
called Internal nostrils. Pharynx is a muscular passage and it is common to
both food and air. It extends to the opening of oesophagus and the larynx.
The air goes from pharynx into larynx.
18. Define glottis?
A narrow opening at the floor of pharynx which leads into larynx is called
glottis,
It is made up of Hyaline Cartilage.
19. Define epiglottis?
Glottis is guarded by flap of tissue called the epiglottis.
It is made up of Elastic Cartilage.
20. What is larynx or voice box?
The air goes from pharynx into larynx is a box made of cartilage, it is present
between pharynx and trachea. It is also called voice box. Two pairs of fibrous
bands are stretched across the larynx. The vocal cords vibrates when air
passes through them. This vibration produced sound.

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BIOLOGY Chapter # 10 GASEOUS EXCHANGE Subjective Type Question 1. Define cellular respiration? A process in which C-H bonds in food are broken by oxidation reduction reactions and the energy is transformed into ATP is known as Cellular Respiration. Respiration involves the mechanical (physical) and bio-chemical processes. C6H12O6 + O2 → CO2 +H2O + Energy (ATP) 2. Define Aerobic Respiration? In aerobic respiration oxygen is used and there is complete oxidation of the food material. Carbon dioxide and water are also produced in this process. 3. Define gaseous exchange? Taking in of oxygen and giving out of carbon dioxide is termed as gaseous exchange. 4. What is breathing? The process through which animals take air in their bodies to get Oxygen from it and then give out the air to get rid of carbon dioxide is known as Breathing. OR The physical movements associated with the gaseous exchange are called breathing. Phases of Breathing: There are two phases of breathing i.e • Inhalation • Exhalation 5. What are Stomata? The leaves and young stems have ting pores in epidermis called stomata. The gaseous exchange occur through these stomata. The inner cells of leaves (mesophyll) and stem also have air spaces among them, which helps in the exchange of gases. 6. How does gaseous exchange occur in leaves and young stems? The leaves and young stems have stomata in their epidermis. The gaseous exchange occur through these stems. The inner cells of leaves (mesophyll) and stem also have air spaces among them, which helps in the exchange of gases. In young stems and leaves, some gaseous exchange also occur through the Cuticle which is present over their epidermis. 7. What is the function of cuticle? In young stems and leaves, some gaseous exchange also occur through the Cuticle which is present over their epidermis. 8. Leaf cells faces two situation write their names? Leaf cells faces two situations are • Day time • Night time 9. Define day time leaf situation? During the day time, when Mesophyll cell of leaves are carrying out photosynthesis and respiration side by side. The oxygen produced in photosynthesis is utilized in cellular respiration. Similarly, the carbon dioxide produces during cellular respiration is utilized in photosynthesis. 10. Define night time leaf situation? During night time, when there is not photosynthesis occurring. The leaf cells get oxygen from the environment and release carbon dioxide. 11. What are Lenticels? Write their function? In woody stems and mature roots the entire surface is covered by bark which is impervious to gases or water. However these are certain pores in the layer of bark. These are called the lenticels. The lenticels allow air to pass through them. Lenticels are slightly more raised than general surface of the stem. 12. How does gaseous exchange occur in young roots? Gases diffuse in and out of the general surface of the young roots. The gases are found in the soil surrounding the roots. 13. How does gaseous exchange occurs in aquatic roots? The aquatic plants get the oxygen dissolved in water and release carbon dioxide in the water. 14. What are air passage ways write their names? The parts through which the outside air comes in the lungs and after the exchange of gases it goes out. This passage of air consists of the following parts: • Nostrils • Nose • Nasal cavity • Pharynx • Larynx • Trachea • Bronchi • Bronchioles • Alveolar • Alveoli 15.What is nasal cavity? The nose encloses the nasal cavity. It open to the outside through the openings called nostrils. The nasal cavity is divide into two portions by a wall. Each portion is lined by fine hairs and mucus which filter the dust particles from air. The mucus also moistens and warms the incoming air and keeps its temperature nearly equal to that body. 16. What are the function of Hair & Mucus in the nose? Hair and mucus in the nose filter the dust particles from the air. The mucus also moisten and warms the incoming air and keeps its temperature nearly equal to that body. 17.What are the role of pharynx in respiration? The nasal cavity opens into the pharynx by means of two small openings called Internal nostrils. Pharynx is a muscular passage and it is common to both food and air. It extends to the opening of oesophagus and the larynx. The air goes from pharynx into larynx. 18. Define glottis? A narrow opening at the floor of pharynx which leads into larynx is called glottis, It is made up of Hyaline Cartilage. 19.Define epiglottis? Glottis is guarded by flap of tissue called the epiglottis. It is made up of Elastic Cartilage. 20.What is larynx or voice box? The air goes from pharynx into larynx is a box made of cartilage, it is present between pharynx and trachea. It is also called voice box. Two pairs of fibrous bands are stretched across the larynx. The vocal cords vibrates when air passes through them. This vibration produced sound. Name: Description: ...
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