Question

acse.
SCIENCE
GEMS
Activity Time
1. Test for Starch in a Leaf.
Boil a green leaf in water, then boil it in alcohol remember, never heat alcohol
the test tube in a beaker with water and then heat it on a flame.
directly on a flame, it will catch fire). Put alcohol in a test tube with a leaf and put
This will remove the chlorophyll from the leal. The process of removing green
colour from a leaf is called bleaching
Wash the leaf in cold water.
Put a few drops of iodine on the leaf, it will turn blue-black. Iodine always turns
starch blue-black. This confirms the presence of starch.
2. Make a Wheel and Axle.
Materials required: An unsharpened pencil, small ball of plasticine, cardboard
Cut two circles of 2 cm radius from the cardboard.
Make a hole in the centre.
Pass a pencil through the two circles. Let
the ends of the pencil remain a little out of
the circles. There should be a gap between
the circles. See the given picture.
Put plasticine at both the ends of the
pencil to hold it in place. Leave it for half
O
P
an hour.
3.
Now roll the pencil. The pencil acts as an axle between the two cardboard wheels.
To show that soil is different in different places, collect some soil from your garden, the
playground and the school garden. You will see the difference. The colours, the texture
(feel), the size of particles, etc. will be different.
Observe the different samples and note down what you see in the table given below.
Place of
Texture
Colour
Size of particles
Dry or wet
Collection
(Coarse or fine)
(big or small)
Class 5
31
Signature
Grade:​

Answer 1

Answer:

sorry bro I don't know this answer

Answer 2

Answer:

can u plz explain what to do here