(1) How would you check the presence of starch in leaves?
(2) Nehabhabhi takes two types of fiber, natural and synthetic. She does not know
which one is natural fiber and which is synthetic fiber. Which activity you will suggest
to identify the fibers?
(3) You are given three solutions A, B and C acid, base and neutral respectively. It is
not possible to identify them just by looking how will you identify the type of solution.
Q:- 5 Do as directed. (10)
(1) Why there are holes on hoardings as well as clothes or plastic banners of
advertisements hanged freely?
(2) Sandy soil is not suitable for cultivation. Give reason.
(3) What kind of clothes would you like to wear in the summer season? Why?
(4) How do elephants adapt to the equatorial rainforest region? Explain.
(5) A monkey can easily live on tree. Give reason.
Q:- 6 Do as directed.
(1) Blue coloured solution is given in the figure. Which solution is it? What causes the
colour change in this solution. Explain.
(03)
(2) A flag near the check post furls in the direction of sea. Is it midnight or afternoon?
Why?
(03)
(3) Describe the experiment showing the conduction of heat in solid substance with
diagram.
(04)
Q:- 7 Complete the equation (04)
1.
Sunlight
Carbon dioxide + Water ___________ + ____________
Chlorophyll
2. Acid + Base _______________ + _____________
Blue colour solution
Iron nail
green colour solution
Radish iron nail
3
Q:- 8 While doing the experiment of percolation in your field you found that 400ml water takes
10 minutes time then what is the percolation rate of the land?
(05)
Q:- 9 Draw the diagram of the digestive system of ruminating animal and write down the
names of any two organs.
(05)
Q:- 10 Do as directed.
(1) How will you make China rose (jasudpatra) using materials found around you? (03)
(2)How will you make anemometer using materials found around you? How will you use it? (03)
Q:- 11 Do as directed. (10)
(1) Explain the usefulness of chemical changes in everyday life.
(2) Which effective safety measures will you take during cyclone
Answers
Answer:
There are two types of fibres – One is natural fibres which are obtained from natural sources e.g. Cotton, silk, wool and other is synthetic fibres which are man-made for example – rayon, nylon, acrylic etc.
An acid–base reaction is a chemical reaction that occurs between an acid and a base. It can be used to determine pH
Acid–base equilibrium
The reaction of a strong acid with a strong base is essentially a quantitative reaction. For example, HCl(aq) + Na(OH)(aq) → H2O + NaCl.
Acids and bases are important in living things because most enzymes can do their job only at a certain level of acidity. Cells secrete acids and bases to maintain the proper pH for enzymes to work. For example, every time you digest food, acids and bases are at work in your digestive system.
Answer:
(2) Nehabhabhi takes two types of fiber, natural and synthetic. She does not know
which one is natural fiber and which is synthetic fiber. Which activity you will suggest
to identify the fibers?
(3) You are given three solutions A, B and C acid, base and neutral respectively. It is
not possible to identify them just by looking how will you identify the type of solution.
Q:- 5 Do as directed. (10)
(1) Why there are holes on hoardings as well as clothes or plastic banners of
advertisements hanged freely?
(2) Sandy soil is not suitable for cultivation. Give reason.
(3) What kind of clothes would you like to wear in the summer season? Why?
(4) How do elephants adapt to the equatorial rainforest region? Explain.
(5) A monkey can easily live on tree. Give reason.
Q:- 6 Do as directed.
(1) Blue coloured solution is given in the figure. Which solution is it? What causes the
colour change in this solution. Explain.
(03)
(2) A flag near the check post furls in the direction of sea. Is it midnight or afternoon?
Why?
(03)
(3) Describe the experiment showing the conduction of heat in solid substance with
diagram.
(04)
Q:- 7 Complete the equation (04)
1.
Sunlight
Carbon dioxide + Water ___________ + ____________
Chlorophyll
2. Acid + Base _______________ + _____________
Blue colour solution
Iron nail
green colour solution
Radish iron nail
3
Q:- 8 While doing the experiment of percolation in your field you found that 400ml water takes
10 minutes time then what is the percolation rate of the land?
(05)
Q:- 9 Draw the diagram of the digestive system of ruminating animal and write down the
names of any two organs.
(05)
Q:- 10 Do as directed.
(1) How will you make China rose (jasudpatra) using materials found around you? (03)
(2)How will you make anemometer using materials found around you? How will you use it? (03)
Q:- 11 Do as directed. (10)
(1) Explain the usefulness of chemical changes in everyday life.
(2) Which effective safety measures will you take during cyclone
1
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Answer:
There are two types of fibres – One is natural fibres which are obtained from natural sources e.g. Cotton, silk, wool and other is synthetic fibres which are man-made for example – rayon, nylon, acrylic etc.
An acid–base reaction is a chemical reaction that occurs between an acid and a base. It can be used to determine pH
Acid–base equilibrium
The reaction of a strong acid with a strong base is essentially a quantitative reaction. For example, HCl(aq) + Na(OH)(aq) → H2O + NaCl.
Acids and bases are important in living things because most enzymes can do their job only at a certain level of acidity. Cells secrete acids and bases to maintain the proper pH for enzymes to work. For example, every time you digest food, acids and bases are at work in your digestive system.
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