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karthikmns
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eval_testing_mns

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indica(neem) Seeds, Barks, Leaves. Antiseptic
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Scopolamine Datura stramonium Fruit, flower Sedative
Pyrethroids Chrysanthemum sps Flower Insecticides
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Papaver Rauwolfia Coffea arabica Tobacco Datura
fig-12: Plants which produce Alkaloids
Name the alkaloids which are harmful to us?
Free distribution by T.S. Government 2019-20 87
Tannins:: Tannins are carbon compounds. These are stored in different
parts of the plant and are deep brown in colour. Tannins are used in tanning
of leather and in medicines e.g. Cassia, Acacia.
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Resin:: Occur mostly in Gymnosperms in specialized passages called resin
passages. These are used in varnishes- e.g.Pinus.
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fig-13(a): Cassia fig-13(b): Acacia fig-13(c): Pinus
Gums:: Plants like Neem, Acacia oozes out a sticky substance called gum
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when branches are cut. The gum swells by absorbing water and helps in the
healing of damaged parts of a plant. Gums are economically valuable and
used as adhesives and binding agents, in the preparation of the medicines,
food, etc.
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Latex:: Latex is a sticky, milky white substance secreted by plants. Latex
is stored in latex cells or latex vessels. From the latex of Hevea
braziliensis (Rubber plant) rubber is prepared. Latex from Jatropa is the
source of bio-diesel. Do you know which part of jatropa used in production
of bio diesel.
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fig-14(a): Neem fig-14(b): Jatropa fig-14(c): Rubber plant
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Do you know?
Chewing gum is a type of sticky for chewing made dates back 5000 years. Modern
chewing gum originally made of natural latex from plants like chicle, sapota etc.
Whenever pollen grains enter in our body they cause allergy due to the presence of
nitrogenous substances. These allergens cause skin allergy and asthma. Ex: Parthenium.
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88 X Class Excretion The wastage disposing system
Do roots secrete?
‘Brugman’ a botanist proved from his experiments that the roots not
only absorb fluid from soil, but returns a portion of their peculiar secretions
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back into it. We can see such instances in plants like apple where a single
apple crop for 4 or 5 years continuously in the same soil, that fail to produce
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fruits. It will not give proper yield even if you use lot of fertilizers.
Do you think there is any relation between reduction in yielding
and root secretions?
Why do we get peculiar smell when you shift the potted plants?
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Excretion Vs Secretion
Excretion and secretion are the same in nature. Since both are involved
in passage or movement of materials. Both processes move and eliminate
unwanted components from the body. Excretion is the removal of materials
from a living being, while secretion is movement of material from one
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point to other point. So secretion is active while excretion is passive in
nature. Humans excrete materials such as tears, urine, Carbon dioxide,
and sweat while secretion on other hand, includes enzymes, hormones,
and saliva. In plants too we find excretion through roots into its surroundings
and falling off leaves and bark. Secretions occur in the plant body in form
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