Answer:
(a)P hotosynthesis
It is a process by which green plants having chlorophyll synthesize simple
sugar (glucose) from water and CO2using the energy of sunlight. The light
energy is used in splitting of water molecules into hydrogen and oxygen (i.e., chemical
energy).
(b) Autotrophs
Those organisms which can make their own food from inorganic substances present
in the environment, e.g., green plants, autotrophic bacteria etc. are called
autotrophs.
(c)
Chloroplasts Chlorophyll is the green pigment capable of trapping light
energy, required for photosynthesis. This pigment is present in chloroplast
present in the leaves.
(d) Guard
cells Each stomatal pore is surrounded by a pair of guard cells, that control
their opening and closing by the inflow and outflow of water.
(e)
Heterotrophs Those organisms which cannot make their own food from inorganic
substances and depend on other organisms for their food. e.g., al! animals,
yeast, etc.
(f)
Pepsin It is a protein digesting enzyme secreted from gastric glands
present in the wall of the stomach.
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