Answer:
Translocation
The transport of food from leaves to all plant parts through phloem tissue is
called translocation. (1)
Mechanism
of Translocation in Plants
Translocation
occurs in sieve tubes in upward and downward direction. Energy from ATP is
utilised for this process. Various theories are given to explain the translocation.
But Munch's mass flow hypothesis is the most accepted one. (2)
The
sieve tubes are helped by then- companion cells for translocation. Sieve tubes
are made of living cells. These are stacked one over the other forming a continuous
column with ends covered by sieve plates. (2)
Or
Nutrition
It is the process by which an organism obtains nutrients from food by ingestion,
digestion, absorption, assimilation etc.
Nutrients
These are the substances required by an organism for growth and maintenance of
life and life processes.
Saprophytic
Nutrition
Holozoic Nutrition
Organism
obtains food from dead and decaying matter.
Organism
breakdown complex organic matter in the simple form of food and absorbs it.
e.g.,
fungi, yeast.
e.g.,
Amoeba, human being.
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