Page 27 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

 It is necessary to destarch a plant before performing any experiment on photosynthesis,

because ....
In any experiment on photosynthesis we have to do Iodine test. When we perform iodine
test, if starch is present it may interfered with the result of the experiment.
 We can’t demonstrate respiration in green plants kept in sunlight, because ...

When we kept the plant in sunlight, photosynthesis occurs in plant. The end products of
)
photosynthesis (C H O and O are the raw materials for respiration. So, we can’t
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6
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demonstrate respiration in green plant kept in sunlight.
 If the concentration of CO increases in the air, the rate of photosynthesis also increases
s
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to a certain extent and stands still there itself.
 The end products of the photosynthesis is Glucose. It is utilised in respiration and gives
energy. If respiration overtakes photosynthesis in a plant Glucose is not sufficient for
respiration. Hence, it leads to the death of the plant.
Human Digestive System - Digestion

Ingestion : Intake of food materials through mouth is called ingestion.
Digestion : The large complex food molecules break down into small, simple molecules in
the alimentary canal with the help of enzymes is called digestion.

Absorption : The passage of digested food through the walls of alimentary tract into
circulatory system.
Assimilation :- Digested food materials, which are present in blood enter into cells is
called Assimilation.

Defecation (or) Egestion : The passage of undigested food materials from the body by the
way of anus.
 Human digestive system contains alimentary canal and digestive glands.
 The alimentary canal is a long tube, starts from the mouth and ends with the anus.

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