What are the different ways in which glucose is oxidized to provide energy in various organisms? - Science

Short Note

What are the different ways in which glucose is oxidized to provide energy in various organisms?


Solution 1

At first glucose (6 carbon molecules) is broken in the cytoplasm of cells of all organisms. This process yields a 3 carbon molecule compound called pyruvate.
Further break down of pyruvate takes place in different manners in different organisms.

→ Anaerobic Respiration: This process takes place in absence of oxygen, e.g. in yeast during fermentation. In this case pyruvate is converted into ethanol and carbon dioxide.
→ Aerobic Respiration: In aerobic respiration, breakdown of pyruvate takes place in presence of oxygen to give rise 3 molecules of carbon dioxide and water. The release of energy in aerobic respiration is much more than anaerobic respiration.
→ Lack of Oxygen: Sometimes, when there is lack of oxygen, especially during vigorous activity, in our muscles, pyruvate is converted into lactic acid (3 carbon molecule compounds). Formation of lactic acid in muscles causes cramp.

Solution 2

Glucose is oxidised in two ways to provide energy.

(a) Aerobic respiration: Glucose is completely oxidised to carbon dioxide and water in the presence of oxygen, with the release of a considerable amount of energy. This type of oxidation occurs in most of the living organisms such as human beings, birds, snakes, frogs, fish, etc.

b) Anaerobic respiration: This type of respiration occurs in the absence of oxygen. In this type of oxidation, glucose is partially oxidised to ethanol and carbon dioxide (yeast and other bacteria) or lactic acid (muscles during physical exercise and some bacteria) with the release of a small amount of energy

Concept: Respiration
  Is there an error in this question or solution?
Chapter 1: Life Processes - Exercise 2 [Page 47]


Lakhmir Singh Class 10 Biology (Science)
Chapter 1 Life Processes
Exercise 2 | Q 33 | Page 47
NCERT Science Class 10
Chapter 6 Life Processes
Intext Questions | Q 2 | Page 105


What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.

If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer.

What is the name of the extensions of the epidermal cells of a root which help in respiration?

There are five animals P, Q, R, S and T. The animal P always lives in water and has gills for breathing. The animal Q can stay in water as well as on land and can breathe both, through moist skin and lungs. The animal R lives in soil and breathes only through its skin. The animal S lives on land and breathes through spiracles and tracheae. And animal T lives in water and breathes through its cell membrane.

(a) Which of the animals could be Amoeba?
(b) Which of the animals could be frog?
(c) Which animal could be fish?
(d) Which animal could be grasshopper?
(e) Which animal could be earthworm?

Some sugar solution is taken in a test-tube and a little of substance X in powder form is added to it. The mouth of test-tube is closed with a cork and allowed to stand for sometime. On opening the cork, a characteristic smell of substance Y is obtained and a gas Z is also observed to be formed. The gas Z extinguishes a burning matchstick.

(a) What could be (i) X, (ii) Y, and (iii) Z?

(b) What is the process of converting sugar into substance Y by the action of X known as?

(c) What type of respiration is exhibited by X in the above process?

When a person breathes in the air, the air enters into his body through an organ A having two holes B in it. The air then passes through the pharynx and larynx and enters into tube C. The tube C divides into two smaller tubes D at its lower end. The two smaller tubes are attached to two respiratory organs E. Each smaller tube divides inside the organs E to form a large number of still smaller tubes called F. The smallest tubes F have air-sacs G at their ends in which gaseous exchange takes place in the body of the person. What are A, B, C, D, E, F, and G?

What is the name of tissues which transport:

water and minerals in a plant?

Veins and arteries carry blood. Which of these carry blood away from the heart?

Answer this question.

Name the organ of respiration in fishes.

Answer this question.

What are the holes on the sides of the body of insects called?

Answer the following in one word.  

What is the muscular sheet below the lungs called?

Tick the most appropriate answer. 

 The products of respiration are :

Differentiate between 

External respiration and Internal respiration 

Answer the following in short.

Define respiration. 

Answer the following in detail.

How is the process of cellular respiration different from breathing?

Answer the following in detail.

Explain the process of Cellular Respiration.

Draw a diagram of the human respiratory system and label - pharynx, trachea, lungs, diaphragm and alveolar sac on it.

Answer the following question.
How is O2 and CO2 transported in human beings?

____________ refers to a biochemical process of oxidation of organic compounds in an orderly manner for the liberation of chemical energy in the form of ATP.

Respiration refers to ____________.

Identify the CORRECT sequence of events for the transport of respiratory gases.

Complete the analogy.

Transport of CO2 by plasma : 7% :: Transport of CO2 by bicarbonate ions: ____________.

The major fraction of CO2 released during cellular respiration is transported by the blood to the lung capillaries ______

____________ is the maximum amount of air that the lungs can hold after a maximum forceful inspiration.

term 'respiration' includes

What percent of oxygen is transported in a dissolved state by the plasma?

With which of the following haemoglobin combines to form carboxyhaemoglobin?

What is the ppCO2 in alveolar air?

______ refers to the physical process by which gaseous exchange takes place between the atmosphere and the lungs.

The partial pressure of oxygen of blood in pulmonary capillaries is i ______  mrnHg while in alveolar air it is ii ______ mmHg.

How much percent of C02 is transported in a dissolved form as carbonic acid?

Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?

Yeast is used in wine and beer industries because it respires

During the process of exhalation, the ribs move

Mark the following statement as True or False. Correct the false statement.

Exhaled air has more percentage of CO2 than inhaled air

Observe Figure 10.2 carefully and answer the following questions.

  1. Which process is being tested in the activity?
  2. What is the result of the activity? Give reasons.

The oxygen dissociation curve is a sigmoid curve and it shifts towards the right due to ______.

Match the correct answers with the type of respiration and respiratory substances.

Respiration Types of Substrates
A. Floating respiration I. Proteins
B. Cytoplasmic respiration II. Glucose
C. Protoplasmic respiration III. Carbohydrates and fats


      Forgot password?
Use app×