Q-7
Describe an experiment to prove that - Plant leaf has starch.
4
Q-8 (A) Draw a labeled diagram.
1. Draw a simple diagram of the flower and label its main parts.
2. Filtration process using filter paper.
6
(B)
Name the place of joint shown in the figure.
3
Q-9(A)
Answers the following questions.
1. What should we do to provide food to each and every person in country?
2. Here is a procedure for separation of substance. Which of the following is used for
separation method?
3. The farmer does not have a fan for the use of the above method. So what other good
option does he have?
3
(B)
Explain the process of separation of substances with the use of more than one method with
an example. (Evaporation and Condensation)
3
Q – 10
(A)
Answer the following questions.
1. What will you do if lot of food is left over that is prepared at your home for a function?
2. An unknown plant has grown on the road next to your house. It’s leaves look very
attractive and fresh. Your friend expresses his desire to taste it. What do you think
about this?
3. We prefer to have a variety of dishes in the diet. What should be the main reason
behind this?
4. You are advised not to be friend with the person because non-vegetarian food is
cooked at his house. You don't want to break this friendship. What argument you will
give for this?
4
(B)
The cell - powered toy car that you got as your birthday gift gets broken by slipping out from
your hand. Now, in this situation that has arisen, mark the following as true against which
you agree with and false against which you disagree with.
1. This toy is broken, it can't be fixed any more.
2. This toy does not need to be repaired. Another new toy can be brought.
3. This is a reversible process. It can be made as it was again.
4. Rebuilding this toy is a scary thing.
5. It is not advisable to take the help of others in your home to recreate this toy.
6. Repairing a broken toy is a waste of time.
7. We don't know the interior design of the toy. So it's not possible to recreate it.
8. Breaking of toy is an auspicious event, it will benefit in the future.
Answers
Answer:
hey mate here is ur answer
Explanation:
Q-7 Describe an experiment to prove that - Plant leaf has starch.
Answer- Starch testing
Iodine solution is used to test leaves for the presence of starch. You need to:
heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions)
heat it in boiling ethanol for a few minutes (this removes most of its colour)
wash with water and spread onto a white tile
add iodine solution from a dropping pipette
After a few minutes, the parts of the leaf that contain starch turn blue-black.
Note that ethanol is heated using a hot water bath. Ethanol boils at 78°C, so a tube of it boils when placed in a beaker of hot water. This is safer than using a Bunsen burner because ethanol is flammable.
Variegated leaves have green parts (where the cells contain chlorophyll) and white parts (where there is no chlorophyll). Only the parts that were green become blue-black with iodine solution, showing the importance of chlorophyll in photosynthesis.
A plant can be ‘de-starched’ by leaving it in the dark for a few hours. Parts of its leaves are covered with dark paper, and the plant is left in the light for a few hours. Only the uncovered parts become blue-black with iodine solution, showing the importance of light in photosynthesis.
Q-8.b Filtration process using filter paper
Name the place of joint shown in the figure
Answer- Filter paper is a semi-permeable paper barrier placed perpendicular to a liquid or air flow. It is used to separate fine solid particles from liquids or gases.
i hope it will help u out ...!!!
for Question 8.A please refer to the given diagram....
please mark as brainliest answer