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Frank Frank Class 10 Biology Part 2

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Chapter 6: Photosynthesis

Exercise

Chapter 6: Photosynthesis Exercise Exercise solutions [Page 74]

Exercise | Q 1.01 | Page 74

Answer the following:

Give the overall chemical equation of photosynthesis in green plants.

Exercise | Q 1.02 | Page 74

Answer the following:

Mention two significant advantages of photosynthesis to the living world as a whole.

Exercise | Q 2.01 | Page 74

Define the following:

Plant pigments

Exercise | Q 2.02 | Page 74

Define the following:

Quantum

Exercise | Q 2.03 | Page 74

Define the following:

Organic food

Exercise | Q 2.04 | Page 74

Define the following:

Light reaction

Exercise | Q 2.05 | Page 74

Define the following:

Photolysis in photosynthesis

Exercise | Q 3 | Page 74

Given below is the overall chemical equation of photosynthesis which is incomplete in certain respects.

\[\ce{CO2 + H2O  ->[Chlorophyll] C6H12O6 + H2O + O2} \]

Rewrite the equation in its complete form .

Exercise | Q 4.01 | Page 74

Distinguish between the following:
Hill reaction and NADP reduction in chloroplast.

Exercise | Q 4.02 | Page 74

Distinguish between the following:
Photosynthesis and photophosphorylation.

Exercise | Q 5 | Page 74

An experiment was set up as shown in the figure given below . The twig in the diagram was intact on the plant and it was as such in sunlight for a few hours .

(i) What is the aim of the above experiment ? 
(ii) Why was potassium hydroxide placed inside the conical flask ?
(iii) What test would you perform on the leaf inside the flask?
(iv) What is the expected result of the above test ?
(v) Is it necessary to similarly test on outer leaf also ? Giva a reason .

Exercise | Q 6 | Page 74

The figure given below represents the vertical section of a leaf.
( i) Name the parts labeled 1 to 5.
( ii ) What do the two arrows (dotted and solid) indicate in the daytime and at night?
( iii) Could you add one more arrow in the figure? If yes, what for?
( iv) How many leaf veins have been shown in this section?

Exercise | Q 7 | Page 74
Give any four differences between photosynthesis and respiration.
Exercise | Q 8.01 | Page 74

Define dark reaction.

Exercise | Q 8.02 | Page 74

Describe an experiment to prove that sunlight is necessary for photosynthesis.

Exercise | Q 8.03 | Page 74

Describe an experiment to prove that sunlight is necessary for photosynthesis.

Exercise | Q 8.04 | Page 74

Mention any two points in which photosynthesis and respiration in plants are opposite to each other.

Exercise | Q 9.01 | Page 74

What is meant by photosynthesis? Why is it so important in nature?

Exercise | Q 9.02 | Page 74

Describe fully one experiment with potted green plant to show that starch is not produced in the leaves when carbon dioxide is not available (diagrams essential)

Exercise | Q 9.03 | Page 74

A healthy oat seeding in a pot is transferred from light to any airy but completely dark room. How would it differ from its original condition in appearance after about a week? Explain the difference.

Chapter 6: Photosynthesis Exercise Exercise solutions [Page 75]

Exercise | Q 1 | Page 75

An experiment was set up as shown in the figure alongside. Look at the figure and answer the following questions:
( i) What is the objective of this experiment?
( ii ) Which plant is used in this experiment?
( iii ) Which gas is evolved in this process?
( iv ) What will happen to the rate of evolution of this gas if a pinch of sodium
bicarbonate is added?
(v ) What will happen if the apparatus is kept in dark?

Exercise | Q 2 | Page 75

Two healthy green plants were placed in the dark for 24 hours. They were then set up, as shown in the figure, for 4 hours. Then a leaf was taken from each plant and
the chlorophyll was removed from the leaves:
( i) What is the next and final step in this experiment?
( ii ) What would be the results of the final step?
( iii ) Why was it necessary to grease the glass sheet?
( iv ) What hypothesis is being tested in this experiment?

Exercise | Q 3 | Page 75
What is the effect of light intensity on the rate of photosynthesis in leaves?
Exercise | Q 4.01 | Page 75

Mention two ways in which photosynthesis is useful to life.

Exercise | Q 4.02 | Page 75

Explain why respiration is said to be a reversal of photosynthesis?

Exercise | Q 4.03 | Page 75

What is the role of chlorophyll in green plant?

Exercise | Q 5 | Page 75
Difference between an autotroph and a heterptroph. Give one example of each organism.
Exercise | Q 6 | Page 75
What is the difference between chloroplast and the chlorophyll?
Exercise | Q 7 | Page 75
Name only two plants you are familiar with, which have no chlorophyll.
Exercise | Q 8 | Page 75
Why is the upper surface of broad leaves greener than their lower surface?
Exercise | Q 9.01 | Page 75

Fill in the blanks in the following equations of two chemical reactions:

(a) \[\ce{---+12H2O->[Light energy]C6H12O6 + --- + ----}\]

(b) \[\ce{--- 6O2->[Chlorophyll] 6 --- +6 ---- + Energy}\]

Exercise | Q 9.02 | Page 75

Name the two processes represented by the above two reactions. 

Exercise | Q 9.03 | Page 75

State any two differences in these processes other than those already indicated in the reactions. 

Exercise | Q 9.04 | Page 75

Which one of these two reactions is the supporter of all life on earth? 

Exercise | Q 10 | Page 75

Complete the following statement by choosing the correct alternative given below : 

All animals would die on the earth if there was no ______.

  • chlorophyll

  • haemoglobin

  • penicillin

Exercise | Q 11 | Page 75
Photosynthesis stops to occurs at a temperature above 35oC. (True/False)
  • True

  • False

Exercise | Q 12 | Page 75
Photosynthesis occurs in all the cells of the plant. (True/False)
  • True

  • False

Exercise | Q 13 | Page 75
Explain briefly how during the day transpiration and photosynthesis are interlinked.

Chapter 6: Photosynthesis Exercise Exercise solutions [Page 76]

Exercise | Q 1 | Page 76

A potted destarched plant was taken in order to prove that light is necessary for photosynthesis.
(i) What is meant by 'destarched plant'? How can it be destarched?
(ii) Using the destarched plant describe step by step how you would proceed to prove that in the absence of light the leaf cannot manufacture starch.

Exercise | Q 2.01 | Page 76

Name the following:

The principle site in a green leaf for photosynthesis.

Exercise | Q 2.02 | Page 76

Name the following:

The products that are formed as a result of photosynthesis.

Exercise | Q 2.03 | Page 76

Name the following:

Three organisms that cannot prepare their own food by photosynthesis.

Exercise | Q 2.04 | Page 76

Name the following:

The main reaction by which the molecule of water is broken down by means of light.

Exercise | Q 2.05 | Page 76

Name the following:

The main mineral constituent of chlorophyll.

Exercise | Q 2.06 | Page 76

Name the following:

The cell organelle responsible for photosynthesis.

Exercise | Q 3.01 | Page 76

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

The raw materials for photosynthesis include water and carbon dioxide.

  • True

  • False

Exercise | Q 3.02 | Page 76

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

Land plants obtain their carbon dioxide from the atmosphere.

  • True

  • False

Exercise | Q 3.03 | Page 76

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

Photosynthesis occurs in underground organs as well as in aerial ones.

  • True

  • False

Exercise | Q 3.04 | Page 76

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

 Photosynthesis results in a gain in dry weight.

  • True

  • False

Exercise | Q 3.05 | Page 76

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

A variegated leaf (one that has white as well as green patches) will only photosynthesize in the green areas.

  • True

  • False

Exercise | Q 3.06 | Page 76

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

The source of energy is light.

  • True

  • False

Exercise | Q 3.07 | Page 76

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

Green light is more effective than any other colour.

  • True

  • False

Exercise | Q 3.08 | Page 76

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

The growing tips of stems and roots will be photosynthesizing actively compared with the rest of the plant.

  • True

  • False

Exercise | Q 3.09 | Page 76

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

Photosynthesis produces oxygen.

  • True

  • False

Exercise | Q 4.01 | Page 76

Fill in the blank:
______ is the process which replenishes the atmospheric oxygen which the animal life consumes in respiration.

Exercise | Q 4.02 | Page 76

Fill in the blank:
Land plants obtain their carbon dioxide from the ______.

Exercise | Q 4.03 | Page 76

Fill in the blank:
Photosynthesis produces oxygen and ______.

Exercise | Q 4.04 | Page 76

Fill in the blank:
Xanthophyll is ______ coloured pigment.

Exercise | Q 4.05 | Page 76

Fill in the blank:
Quantasome is the basic unit of ______.

Exercise | Q 4.06 | Page 76

Fill in the blanks:
The end products of photosynthesis are ______ and ______.

Exercise | Q 4.07 | Page 76

Fill in the blank:
CO2 enters the leaf through ______.

Exercise | Q 5 | Page 76

Match the terms of column I with those in column II: 

Column I  Column II 
(i) Stomata closed  (a) decomposers 
(ii) Autotrophs  (b) light reaction 
(iii) By-products of photosynthesis  (c) animals 
(iv) Photolysis  (d) during night 
(v) Bacteria and fungi  (e) green plants 
  ( f) oxygen 
Exercise | Q 6 | Page 76
Fill in the blank with the function:
Chloroplasts ______.
Exercise | Q 7 | Page 76
Mention any three adaptations found in plants to favour the process of photosynthesis.
Exercise | Q 8 | Page 76
Write a short note on carbon cycle.
Exercise | Q 9 | Page 76
How does the carbon cycle maintain the balance of nature?
Exercise | Q 10 | Page 76
"Human activities are harmful to the balance of nature." Comment.
Exercise | Q 11 | Page 76
How is carbon dioxide removed from the atmosphere? Explain.

Chapter 6: Photosynthesis Exercise Exercise solutions [Page 77]

Exercise | Q 1 | Page 77

How does carbon dioxide return to the atmosphere? Explain.
A student in order to study the importance of certain factors of photosynthesis took a potted plant and kept it in the dark for over 24 hours. Then in the early hours of the morning the student covered one of the leaves with black paper in the centre only. Student placed the potted plant in the sunlight for a few hours, and then tested the leaf which was covered with black paper for starch.
(i) What aspect of photosynthesis was being investigated?
(ii) Is there any control in this experiment? If so, state the name.
(iii) Why was the plant kept in the dark before the experiment?
(iv) Describe step by step how the candidate proceeded to test the leaf for the presence of starch.

Exercise | Q 2 | Page 77

The diagram is set up to demonstrate an experiment. Pond weed was placed in five water-filled tubes. The experiment was set up as shown in the diagram. The tubes were then left for 24 hours. Write the correct answer out of the five available choices: 

(i) In which tube would you except to find the plant with the least amount of starch? 
(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5 

(ii) The tube in which most oxygen would be found is 
(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5 

(iii) The tube in which least carbon dioxide would be found is 
(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5 

(iv) The tube in which the plant would survive for the shortest length of time is 
(a ) 1 (b) 2 (c) 3 (d) 4 (e) 5 

Exercise | Q 3 | Page 77

Complete the following by filling in the blanks numbered 1 to 10 with the appropriate word/term:

Photosynthesis involves light reaction and dark reaction. During light reaction, the chlorophyll present in the (1) ______ gets activated by absorbing light energy. This energy splits (2) ______ molecules to (3) ______ and oxygen and releases two electrons. This process is called (4) ______. The (5) ______ ions are picked up by NADP to form (6) ______. The ADP is converted to (7) ______. This process is called (8) ______. During the dark phase, the compound produced at the end of the light reaction reacts with carbon dioxide to form (9) ______. This product is converted to starch. The process is called (10) ______.

Exercise | Q 4 | Page 77

The diagram alongside refers to an experiment in which the apparatus was set up with the light source 10 cm away from the plant. After 15 minutes the number of bubbles evolved per minute from the cut stem was recorded. The light source was moved to 20 cm away from the plant, left for 15 minutes and the number of bubbles evolved per minute was again recorded. The experiment was repeated with the light source at distances of 40, 60, 80 and 100 cm away from the plant. Plot a graph for the results obtained and answer the following questions.

(i) From the graph it seems likely that the rate of bubbling per minute at 50 cm would have been
(a) 2.0 (b) 2.5 (c) 3.0 (d) 3.5
(ii) The gas produced by the plant during the experiment was
(a) air (b) oxygen (c) carbon dioxide (d) nitrogen (e) hydrogen
(iii)    The gas collected comes due to the breakdown of
(a) glucose (b) starch (c) water (d) air (e) ATP
(iv) If ice cubes were added to the water, the rate of bubble formation would
(a) Stay the same.
(b) Increase because more water is added.
(c) Decrease because the temperature drops.
(d) Decrease because water freezes.
(e) Cannot tell from the information given.
(v) If some sodium bicarbonate is added to the water the rate of bubble formation
(a) Increases because more respiration occurs.
(b) Increases because more photosynthesis occurs.
(c) Increases because the gas becomes less soluble.
(d) Decreases because carbon dioxide acts as a limiting factor.
(e) Decreases because respiration decreases.

Chapter 6: Photosynthesis Exercise Exercise solutions [Page 78]

Exercise | Q 1 | Page 78

The diagram alongside represents an experiment conducted to prove the importance of a factor in photosynthesis. 

Study the same and then answer the questions that follow: 
(i) Name the factor being studied in his experiment. 
(ii) Why was the plant kept in a dark room before conducting the experiment? 
(iii}Why was the experimental leaf then kept in 
1. boiling water 2. methylated spirit? 
(iv) Name the solution used to test for the presence of starch in the leaf. 
(v) What will we observe in the experimental leaf at the end of the starch test? 
(vi) Give a balanced chemical equation to represent the process of photosynthesis. 

Exercise | Q 2.01 | Page 78

Choose the correct answer:
Which one of the following is the best reason for leaving a plant in a dark place before carrying out experiments on photosynthesis?

  • To remove chlorophyll from the leaves.

  • To increase the release of CO2 by the leaves.

  • To remove starch from the leaves.

  • To stop synthesis process in the leaves.

Exercise | Q 2.02 | Page 78

Choose the correct answer:
Which one of the following features of plant leaves plays an important part in photosynthesis?

  • Thick cuticle

  •  Spongy mesophyll

  • Chloroplasts 

  • Stomata

Exercise | Q 2.03 | Page 78

Choose the correct answer:
The specific function of light energy in the process of photosynthesis is to ___________

  • Reduce carbon dioxide

  • synthesize glucose

  • Activate chlorophyll

  • split water

Exercise | Q 2.04 | Page 78

Choose the correct answer:
In a typical leaf, photosynthesis occurs mainly in ___________

  • Cuticle

  • epidermis

  • Palisade mesophyll

  • spongy Mesophyll

Exercise | Q 2.05 | Page 78

Choose the correct answer:
Energy is transformed from the light reaction to the dark reaction by _______________

  • Chlorophyll

  • ADP

  • ATP

  • RuDP

Exercise | Q 2.06 | Page 78

Choose the correct answer:
A cell that lacks chloroplast does not ______________

  • Evolve CO2

  • liberate O2

  • Require water

  • utilize carbohydrates

Exercise | Q 2.07 | Page 78

Choose the correct answer:
Light reaction takes place in ____________

  • Grana

  • stroma

  • Chloroplast membrane

  • endoplasmic reticulum

Exercise | Q 2.08 | Page 78

Choose the correct answer:
Photosynthesis is more active in ___________

  • green light

  • red light

  • Yellow light

  • violet light

Exercise | Q 2.09 | Page 78

Choose the correct answer:
Which of the following gas is used in photosynthesis?

  • Oxygen

  • Hydrogen

  • Nitrogen

  •  Carbon dioxide

Exercise | Q 2.1 | Page 78

Choose the correct answer:
The process of photosynthesis occurs by _________

  • carbon dioxide and water

  • carbon dioxide, chlorophyll and water

  • water, chlorophyll, sunlight

  • water, carbon dioxide, chlorophyll and sunlight

Chapter 6: Photosynthesis

Exercise

Frank Frank Class 10 Biology Part 2

Frank Class 10 Biology Part 2 - Shaalaa.com

Frank solutions for Class 10 Biology chapter 6 - Photosynthesis

Frank solutions for Class 10 Biology chapter 6 (Photosynthesis) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Frank Class 10 Biology Part 2 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Frank textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 10 Biology chapter 6 Photosynthesis are Concept of Photosynthesis, Experiments - Show the Necessity of Light, Carbon Dioxide and Chlorophyll, Emphasis on Destarching and the Steps Involved in Starch Test., Carbon Cycle, The Internal Structure of Chloroplast, Opening and Closing of Stomata Based on Potassium Ion Exchange Theory., Overall Balanced Chemical Equation to Represent Photosynthesis., Introduction of the Terms "Photochemical" for Light Phase, "Biosynthetic" for Dark Phases., Light Reaction, Dark Reaction, Experiments with Regard to the Factors Essential for Photosynthesis.

Using Frank Class 10 solutions Photosynthesis exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Frank Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 10 prefer Frank Textbook Solutions to score more in exam.

Get the free view of chapter 6 Photosynthesis Class 10 extra questions for Biology and can use Shaalaa.com to keep it handy for your exam preparation

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