Question

Respiration is a property of all living organisms. It is a process in which food is broken down
in the presence or absence of oxygen. Depending on whether the food is broken down in the
presence or absence of oxygen, respiration is of two types: Aerobic and Anaerobic
respiration.
In aerobic respiration, food molecules are completely broken down into the water, carbon
dioxide and energy is released in the form of ATP in the presence of oxygen. All higher
organisms respire aerobically and this process requires atmospheric oxygen. It is highly
efficient in comparison to anaerobic respiration. One molecule of glucose gives 38 ATP
molecules.
Anaerobic respiration occurs within the cytoplasm of prokaryotic organisms like bacteria and
yeast. In this process, less energy is released due to the incomplete oxidation of food in the
absence of oxygen. Carbon dioxide and Ethyl alcohol are produced during anaerobic
respiration in plants. In animals glucose is broken down to lactic acid .Very less energy is
released during this type of respiration. Only 2 ATP molecules are released from one
molecule of glucose.
Photosynthesis is the process by which plants prepare their own food. This process is
common to all green plants containing chlorophyll pigments. It synthesizes foods. It stores
energy. It is an anabolic process. It comprises products like sugar, oxygen, and water as
products. During Photosynthesis, solar energy is converted into chemical energy. It takes
place only in the presence of sunlight.
Respiration is common to all living things including plants, animals, birds, etc.It oxidizes
foods. It releases energy. It is a catabolic process. It comprises products like water and carbon
dioxide. It takes place continuously throughout the life process from birth to death.
Photosynthesis takes place only in the parts of plants that contain chlorophyll, i.e. only in the
green parts of the plants. The process of photosynthesis is so prominent that it sometimes
masks the process of respiration in plants. However, we must know that respiration in plants
occurs throughout the day while photosynthesis process takes place only in the presence of
light. Therefore, at night the respiration in plants becomes prominent.
Answer the following:
1. Name the following:
a) Complete breakdown of glucose.
b) Breakdown of food in the absence of oxygen.
c) The process that is common in both plants and animals.
d) Pigment required for photosynthesis.
2. Fill in the blanks:
a) Energy is released in the form of _________during respiration.
b) Breakdown down of _______________ takes place during respiration.
c) _________ respiration is more efficient.
d)__________ takes place throughout day and night in plants.
3. Rewrite the given statements by changing the word in bold.
a) Photosynthesis is a catabolic process.
___________________________________________________________________________
b) Yeast produces alcohol during aerobic respiration.
___________________________________________________________________________
c) One glucose molecule releases 2ATP molecules during aerobic respiration.
___________________________________________________________________________
d) Respiration takes place only in plants.
___________________________________________________________________________
4. Differentiate between the following on the basis of words given in brackets.
a) Aerobic and Anaerobic respiration (Oxygen required)
___________________________________________________________________________
b) Respiration and Photosynthesis (Gas released)
___________________________________________________________________________
5. Name the products formed in plants and animals during anaerobic respiration.
___________________________________________________________________________
6.How do respiration and photosynthesis maintain balance in nature?
___________________________________________________________________________
7.Write the chemical equation for photosynthesis and respiration

Answer 1

1 (a) Respiration

b) Anerobic repiration

c) Respiration

d) Chrophyl

2 a) ATP molecules

b) GLUCOSE

c) Aerobic respiration

d) Respiration

3rd one u can do easily

4)

a) Respiration take place in presence of O2 called Anerobic repiration while Respiration take place in absence of O2 called Anerobic repiration

b) in respiration CO2 released In Photosysnthesis O2 released

5) acid and low ATP

6)