Q: The diagram of human Respiratory is given below. Label the diagram. (5 marks)
You may be given diagrams and shall be asked to label the diagrams. Sometimes additional questions along with the diagram may also be asked. In such case, write the answer according to your logic or reasoning.
For example:
Q: What will happen if lungs does not possess alveoli?
A: If the lungs does not possess alveoli, the exchange of gases will not be possible in an easy way like how it happens now.
(Practice other diagrams like Mitochondria and diaphragm given in the lesson. Guess possible questions that can be asked about them and try to answer them).
Q. Distinguish between aerobic and anaerobic respiration. (4 marks)
Aerobic Respiration:
1) This type of respiration takes place in the presence of oxygen.
2) Complete oxidation of glucose takes place in this process.
3) End products are carbon dioxide and water.
4) 38 ATP of energy is liberated in this process.
5) Energy liberated is high.
6) This process occurs in plant and animal cells.
Anaerobic Respiration:
1) This type of respiration takes place in the absence of oxygen.
2) Glucose is incompletely oxidized in this process.
3) End products are either ethyl alcohol or lactic acid and carbon dioxide.
4) 2 ATP of energy is liberated in this process.
5) Energy liberated is low.
6) This process occurs in many bacteria and human muscle cells.
(When you write a table of differences, you should know that you can answer definitions as well as two essays if you were asked the questions separately also. (even if short answers are asked).
Tenth Class Biology Imporant Questions - New Syllabus
Q: Do you know why people who go to high altitudes carry an oxygen cylinder on their back? Blood cannot carry enough oxygen required by the body when we go above the sea level. What are the possible consequences if we don't get enough oxygen supply?
A: At sea level the atmospheric concentration of oxygen is approximated 21% and the barometric pressure averages 760 mmHg. At higher altitudes the 21% remains the same; however the number of oxygen molecules per breath is reduced. At about 5,500 meters (18,000 ft) each breath contains approximately half the normal amount of oxygen (compared to sea level). In order to compensate for the oxygen shortfall the person has to breathe faster and their heart has to beat faster too. Even though breathing faster raises blood oxygen levels, they do not reach sea level concentrations.
Rising to higher altitudes can also cause fluid to leak from tiny blood vessels (capillaries), resulting in potentially dangerous fluid accumulation in the lungs and / or the brain. If a human continues rising to higher altitudes without adequate acclimatization, there is a serious risk of life-threatening illnesses.
(Write the information you collected in tabular form. Put relevant words in columns related to your survey. Write about the experiences you gained while doing your project work.)
A: At sea level the atmospheric concentration of oxygen is approximated 21% and the barometric pressure averages 760 mmHg. At higher altitudes the 21% remains the same; however the number of oxygen molecules per breath is reduced. At about 5,500 meters (18,000 ft) each breath contains approximately half the normal amount of oxygen (compared to sea level). In order to compensate for the oxygen shortfall the person has to breathe faster and their heart has to beat faster too. Even though breathing faster raises blood oxygen levels, they do not reach sea level concentrations.
Rising to higher altitudes can also cause fluid to leak from tiny blood vessels (capillaries), resulting in potentially dangerous fluid accumulation in the lungs and / or the brain. If a human continues rising to higher altitudes without adequate acclimatization, there is a serious risk of life-threatening illnesses.
(Write the information you collected in tabular form. Put relevant words in columns related to your survey. Write about the experiences you gained while doing your project work.)
10th Biology Important Questions from New Syllabus
Q: How do you test the changes during combustion of sugar? Write the experiment you have conducted in your school. (4 Marks)
i) Is heat production always the same in our body?
ii) How are carbon dioxide and water formed in this experiment?
Aim: To observe changes during combustion of sugar.
Apparatus: Wooden stand, test tubes, rubber stopper, delivery tube, glucose or sucrose powder, lime water.
Procedure: Take a small test tube and add a little amount of glucose to it.
Arrange the apparatus as shown in the figure.
Heat the test tube with a Bunsen burner.
Heat until the glucose catches fire.
Observation: When glucose in the test tube starts burning, you will observe that carbon dioxide and water are produced and energy is released as heat.
Glucose is burnt at high temperature so that it liberates energy.
Once the glucose burns, we cannot stop the process easily.
When water is added to the burning sugar, the combustion stops.
The carbon dioxide released in this process changes lime water to milky white.
Inference: From this experiment, we can conclude that during combustion of glucose in the laboratory, carbon dioxide, water and heat are produced.
The carbon dioxide produced changes lime water to milky white in nature.
i) Heat production is not the same always in our body. It is normal when we are at rest. It increases when we do some strenuous work.
ii) When sugar is burned, the bonds holding the atoms together in the oxygen molecules and sugar molecules break and the atoms rearrange themselves to form carbon dioxide and water molecules.
(There are other experiments too in this lesson. See activities 2, 5 and 6 in the textbook and prepare the same type of answers).
i) Is heat production always the same in our body?
ii) How are carbon dioxide and water formed in this experiment?
Aim: To observe changes during combustion of sugar.
Apparatus: Wooden stand, test tubes, rubber stopper, delivery tube, glucose or sucrose powder, lime water.
Procedure: Take a small test tube and add a little amount of glucose to it.
Arrange the apparatus as shown in the figure.
Heat the test tube with a Bunsen burner.
Heat until the glucose catches fire.
Observation: When glucose in the test tube starts burning, you will observe that carbon dioxide and water are produced and energy is released as heat.
Glucose is burnt at high temperature so that it liberates energy.
Once the glucose burns, we cannot stop the process easily.
When water is added to the burning sugar, the combustion stops.
The carbon dioxide released in this process changes lime water to milky white.
Inference: From this experiment, we can conclude that during combustion of glucose in the laboratory, carbon dioxide, water and heat are produced.
The carbon dioxide produced changes lime water to milky white in nature.
i) Heat production is not the same always in our body. It is normal when we are at rest. It increases when we do some strenuous work.
ii) When sugar is burned, the bonds holding the atoms together in the oxygen molecules and sugar molecules break and the atoms rearrange themselves to form carbon dioxide and water molecules.
(There are other experiments too in this lesson. See activities 2, 5 and 6 in the textbook and prepare the same type of answers).
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