factors altering of respiration

1. Presented by:
Shatabdi Dhar Bithi
Roll: BKH1819019F
Imran Hossen
Roll: ASH1819017M
Mita Mahmuda
Roll: BKH1819015F
Md. Shahadat Hossain
Roll:ASH1819043M

2. What is Respiration in Plants
Respiration is a process in which complex organic substances
like carbohydrates, proteins, fats are broken down to release
CO2 and water.
C6H12O6 (glucose) + 6O2 (oxygen) --> 6CO2 (carbon dioxide)
+ 6H2O (water) + energy (36 ATP)
All living things both plant and animal cells use the process
of respiration to release energy from glucose

3. Types of Respiration
Aerobic Respiration
Anaerobic Respiration
Aerobic respiration has 3 steps –
I. Glycolysis
II. Krebs cycle
III. Electron transport system

4. Glycolysis
 Glycolysis is the first step in the breakdown of glucose
to extract energy for cellular metabolism.
10 ATP
-2 ATP
6 ATP
2 ATP
2 ATP

5. Krebs Cycle
This cycle occurs in the matrix of mitochondria. The net result is the
production of CO2 when the acetyl group entering the cycle as Acetyl
CoA.
6 ATP
6 ATP
2 ATP
4 ATP
6 ATP

6. Electron transport system
It is 3rd step of respiration. It takes place in inner
mitochondrial membrane.
1 ATP 1 ATP 1 ATP

7. How does plant get energy?
The process photosynthesis to make food .using the
sunlight . break down carbondioxide and form glucose,
the main energy molecule in plant.

8. Usefulness of energy in plant
Produce energy.
Provide cells with oxygen and expel carbondioxide.
Important for plant metabolism, gaseous exchange.
Produced photosynthesis and turn into energy for
growth .
Caring out various life processes.

9. Significance of respiration
It release energy which is consumed in various
metabolic process essential for plant life
It brings about the formation of other necessary
compounds participating as important cell
constituents
It converts insoluble food into soluble from
It liberates CO2 and plays a part actively in
maintaining the balance of carbon cycle

10. Factors altering the rate of respiration
 Temperature
Affecting the activity of enzymes. Q10 = 2 or 3. Optimum
temperature is 20- 30° C. At high temperature the rate of
respiration declines with time and at very low temperature, the
respiration ret is insignificant.
 CO2
Increase in CO2 concentration and absence of O2
adversely affect the of aerobic respiration.
 Light
Control respiration by raising the temperature of an
organism

11. Continue…
 O2- Extinction point
i.e., minimum oxygen concentration at which aerobic
respiration takes place which is 3-100% of oxygen. In some
cases a direct relation between the respiration rate and
oxygen concentration has been reported.
 Water
Very low water content in dry seeds and stored tubers is
responsible for very feeble rate of respiration. In wilted
tissues the stored starch converted into sugars which increase
the rate of respiration while in well hydrated plants the rate
of respiration is not likely to be affected much by slight
changes in the water content.
 Respiratory substrates
Higher availability of respiratory substrates increases the
rate of respiration upto a certain limit.

12. Continue…
 Stimulation
Mechanical disturbance, injury or infection increases
respiration. Hopkins (1927) found that in wounded plant
tissue the sugar content is suddenly increased which is
responsible for temporary increase in the respiration rate.
 Climacteric fruits
Such fruits have high rate of respiration during their ripening
e.g.. Banana, Apple.
 Inhibitors
A number of chemicals inhibit respiration e.g., azide,
cyanide, malonate, carbon, monoxide etc.
 Protoplasmic factor
Young growing cells exhibit high rate of respiration as
compared to mature cells.

13. References
 উদ্ভিদদ্ভিজ্ঞান- আমজাদ আলী খান ও তদ্ভিকুল ইসলাম
 https://www.slideshare.net/FIRDOUS88/respiration-
12818683
 https://byjus.com/biology/plant-respiration/
 https://www.wikipedia.org
 https://www.pthorticulture.com › training-center › basics-
of-plant-respiration
 https://sciencing.com › Science › Nature › Plants &
Mushrooms

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