9th Class Biology: chapter 7 Bioenergetics Short Questions Answer

9th Class Biology: chapter 7 Bioenergetics Short Questions Answer

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Define Light Reactions?

Such reactions which need light for their completion are called light-dependent reactions.
What is Cellular Respiration?

Organisms utilize oxygen for the breakdown of C-H bonds present in the food in their cells. This breakdown yields energy which is transformed into ATP. During this process the C-H are broken by oxidation- reduction reaction and so carbon dioxide and water are also produced. The cellular energy-yielding process is called cellular respiration.
ATP stand for?

ATP stand for adenosine triphosphate.
What is the effect of carbon dioxide concentration on Photosynthesis?

As carbon dioxide concentration rises, the rate o photosynthsisi goes on increasing until limited by other factors. Increase in carbon dioxide concentration beyond a certain level causes the closure of stomata and it decreases the rate of photosynthesis.
Describe the effect of a active site intensity of light on the speed of photosynthesis?

The rate of photosynthesis varies with light intensity. It decreases as the light intensity decreases and increases as the intensity increases. However at much higher light intensity, the rate of photosynthesis becomes constant.
Define aerobic and anaerobic respiration?

Aerobic respiration: They type of respiration which occurs in the presence of oxygen is called Aerobic respiration.
Anaerobic Respiration: That type of respiration which take place in absence of oxygen is called anaerobic respiration.
What is difference between oxidation and reduction?

Oxidation: The loss of electrons is called oxidation.
Reduction: The gain of electrons is called reduction.
Define alcoholic fermentation?

Alcoholic fermentation occurs in bacteria yeast etc. In this type pyruvic acid is further broken down into alcohol and CO2.
What is Photosynthesis? Write its chemical equation?

Photosynthesis is the synthesis of glucose with oxygen as a by-product from carbon dioxide and water in the presence of sunlight and chlorophyll. All life depends on photosynthesis.
Why is ATP considered as the energy currency of the cell?

The major energy currency of all cells is a nucleotide called adenosine triphosphate.
What is ATP and who discover it?

The major energy currency of all cells is a nucleotide called adenosine triphosphate.
Discovery of ATP: ATP was discovered in 1929 by karl lohmann, and was proposed to be the main energy-transfer molecule in the cell by the Nobel prize winner, Fritz Lipmann in 1941.
Give the full name of F.A.D?

Flavin adenine dinucleotide FAD is a co-enzyme.
What is abbreviation of NAD? Where it is used?

NAD stands or Nicotine-amide adenine dinucletide. A co-enzyme used in oxidation-reduction reactions.
What are Pigment and what is its colours in chlorophyll?

Pigment are the substances that absorb visible light. Different pigments absorb light of different wavelengths. The photosynthetic pigments are organized in the form of clusters, called photosystems, in thylakoid membranes of chloroplasts.
What is kreb cycle?

The process in which pyruvic acid molecules are completely oxidized, along with the formation of ATP, NADH and FADH2 is known as kreb cycle.
State the importance of Chlorophyll in plants?

Sun light energy is absorbed by chloroplyll. It is then converted into chemical energy, which drives the photosynthetic process only one percent of light falling on leaf surface is absorbed, the rest is reflected or transmitte.
Light rays of different wave lengths are not only differently absorbed by photosynthetic pigments but are also differently effective in photosynthesis. The blue and red lights carry out more photosynthesis.
Define limiting Factors. Name the limiting factors in photosynthesis?

The environmental factor whose deficiency or absence decrease the rate of metabolic reaction is called limiting factor.
Following are limiting factors in photosynthesis light intensity, temperature and concentration of CO2.
What is glycolysis? Where does this reaction occur?

Bradk down of glucose molecule is called glycolysis.
This process is occur in cytoplasm.
What is the role of pigments in photosynthesis?

Those substance which absorb visible light are called pigments. Photosynthetic pigments are organized in the form of cluster known as photosystems. Chlorophyll is main photosynthetic pigment all these are used to absorb visible light which run the process of photosynthesis.
Which molecule is called energy currency of cell? Write name of its major parts?

ATP is called energy currency of cell. Each ATP molecules has three parts. A adenine a double ringed nitrogenous base. A ribose five carbon sugar and three phosphate group in linear chain.
Define ATP. Write its function in cell?

The major energy currency of all cells is nucleotide called adenosine triphosphate.
It’s main function is to store energy.
What is meant by Dark reaction?

The series of reaction in photosynthesis, which occur in absence of light is called dark reaction.
Write the chemical equation of Aerobic Respiration?

Chemical equation for aerobic respiration is:
C6H12O6+602……………………… 6CO2 + 12H2O+ Energy
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