Question

substance called cytoplası.
contal15.
Oxygen
the presence of sunlight, use carbon
through the tiny pores present on the
surface of leaves. These pores are
surrounded by 'guard cells'. Such pores
are called stomata [Fig. 1.2 (c)].
carbohydrates (Fig. 1.3). The process
can be represented in an equation:
Carbon dioxide + water
chlorophyll
Carbohydrate + oxygen
food from carbon dioxide and
wate
Chlorophyll
Boojho wants to know how water
and minerals absorbed by roots
reach the leaves.
Fig. 1.3 Diagram sho
photosynthesis
During the proces
(
released. The presence
leaves indicates the
photosynthesis. Sta
carbohydrate.
1909
necessary to carry out the process
Stoma
Water and minerals are transported
to the leaves by the vessels which run
like pipes throughout the root, the stem,
the branches and the leaves. They form
a continuous path or passage for the
nutrients to reach the leaf. They are
called vessels. You will learri more about
transport of materials in plants in
Chapter 11.
Guard Cells
(b) Section of a leaf
Boojho has of
plants with de
brown leave
know wheth
also carry
Guard cells
on the earth. The solar energy
captured by the leaves and stored in th.
plant in the form of food. Thus, sun
the ultimate source of energy for a
living organisms.
Can you imagine life on earth in th
absence of photosynthesis!
In the absence of photosynthesis
there would not be any food. The
survival of almost all living organisms
directly or indirectly depends upon the
food made by the plants. Besides,
oxygen which is essential for the survival
(a) Leaf
Paheli wants to know what is so
special about the leaves that they
can synthesise food but other
parts of the plant cannot.
Activity 1.
Stomatal opening Take two pott
Keep one in
for 72 hour
(c) Stoma
Fig. 1.2
SCIENCE
The leaves have a green pigme dioxide and water to synthesise
called chlorophyll. It helps leaves
capture the energy of the sunlight. Th.
energy is used to synthesise (prepar
Since the synthesis of food occurs in tl
presence of sunlight, it is calle
photosynthesis (Photo: light; synthesis
to combine). So we find that chlorophyll
sunlight, carbon dioxide and water an
photosynthesis. It is a unique proces​

Answer 1

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