look around in nature is an absolute
treat to our senses. We all enjoy the
colors and fragrance of plants but seem
to forget about their important
contribution plants are an absolute
necessity for life on Earth. it is so
because of the process of photosynthesis
a closer look at a plant shows that it
is firmly held in the soil by the help
of roots these roots absorb water from
the soil and through the tiny tubes
transport it to the stem. After then transport to the
leaves. The stem always holds the leaves in
a way that they absorb maximum energy
from sunlight a leaf is a very important
part of the plant photosynthesis. The
ultimate provider of food and oxygen
occurs in the leaf. A leaf consists of a
flat thin lamina. which is joined to the
stem with the help of petiole. The flattened lamina
provides large surface area for trapping
sunlight
a cross-section of the leaf shows the
upper and lower layers of cells which
are flat and irregular below the upper
layer is the layer of tightly packed
cells these cells have specialized
organelles called chloroplasts
chloroplasts contain the pigment
chlorophyll which gives the green color
to the leaf. The next layer has loosely
arranged cells with large air spaces the
section also shows tubes specific for
transporting the absorbed water into the
leaves the lower layer has many pores
called stomata each stoma is surrounded
by two guard cells which regulate
opening and closing of the stomata a
leaf absorbs carbon dioxide from the
environment through these stomata which
after passing through air spaces enter
into the chlorophyll containing cells
both water and carbon dioxide molecules
are finally absorbed by the chloroplast
these chloroplasts also have the
capacity for trapping energy from
sunlight in this energy is used to
synthesize glucose and oxygen from
carbon dioxide in water these oxygen and
glucose molecules diffuse out of the
chloroplast
the glucose is transported through other
specialized tubes to all parts of the
plant eating in their growth the oxygen
present in these air spaces diffuses out
through the stomata so during
photosynthesis oxygen is given as the
life-sustaining gaseous component of the
atmosphere while glucose or food is
transported to all parts of the plant
and used for growth
to summarize green plants can make their
own food by the process of
photosynthesis plants are held in the
soil with the help of roots these roots
absorb water and send it to the leaves
through specialised tubes the lower
layer has many pores called stomata a
leaf absorbs carbon dioxide from the
environment through these stomata both
water in carbon dioxide molecules are
finally absorbed by the chloroplast
we're in the presence of chlorophyll and
sunlight they synthesize glucose and
release oxygen the oxygen diffuses out
through the stomata. Through other specialized
tubes, the glucose is transported to all parts of the plant which is aiding
in their growth.
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