AP SSC important questions
1. Explain the structure chloroplast with a
neatly labelled diagram.
Structure
of chloroplast
1) The chloroplast is a membranous structure, consisting of 3 membranes.
2)
The intermediary fluid filled portion called as stroma is responsible for
enzymatic reactions leading to the synthesis of glucose, which in turn join
together to for starch.
3)
Typical chloroplasts are disc shaped and are filled with colourless area called
stroma.
4)
They are covered by two membranes.
5)
Stacks of thylakoid membranes are located in the stroma and are connected by
stroma lamella.
6)
Due to the presence of chlorophyll, chloroplasts are green.
7)
The chlorophyll pigment is fat soluble and is located in the lipid part of the
thylakoid membrane.
8)
Chlorophyll is organized to form the reaction centres called photosystem-1 and
photosystem-11.
2. Write the difference
between light reaction and dark reaction.
|
Light reaction |
Dark
reaction |
|
1) It
occurs in the presence of light. |
1) It
occurs in the presence and absence of light. |
|
2) It
occurs in the green thylakoids. |
2) It
occurs in stroma of chloroplast. |
|
3) In
this reaction, photolysis occurs. |
3)
Carbon fixation takes place here. |
|
4) In
thils reaction ATP and NADPH2 are formed. |
4) In
this reaction ATP and NADPH2 are utilized. |
|
5) It is
oxidative process because electrons are released. |
5) It is
reduction reaction since electrons are accepted. |
3. How would you
demonstrate that plants release oxygen when exposed to light?
AIM: To demonstrate that green plants release oxygen when exposed to light.
MATERIALS REQUIRED: Two identical sets of
test tube, beaker, water, funnel, hydrilla plant.
PROCEDURE:
1)
Arrange
the apparatus as shown in the figure.
2)
Place
some water plant in a beaker containing pond water and cover these by a short
stemmed funnel.
3)
Invert
a test-tube filled with water over the
stem of the funnel. Ensure that the level of water in the beaker is above the
level of stem of the inverted funnel.
4)
Place
one set of apparatus in the sum for atleast 3 days. Keep the other in the dark.
OBSERVATION:
1)
You
would see that in place of water there is air that fills the test tube, which
is kept in the sunlight. It is actually gas that will collect in the test tube.
2)
Test
the gas in the test tube by inserting a glowing incense stick which would burst
into flames.
3)
In
the other set you can find only a little gas.
INFERENCE: This shows the presence
of oxygen.
4. Draw a neatly labelled
diagram of chloroplast found in leaf, and write about its role in
photosynthesis?
During photosynthesis several events occur in the chloroplast like:
1) Conversion of light energy to chemical energy.
2) Splitting of water molecule.
3) Reduction of carbon dioxide to carbohydrates.
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thankyou.
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