Saprophytic organisms feed on decaying organic matter in the environment, obtaining nutrients without harming other organisms. Parasitic organisms feed by living in or on a host organism, belonging to a different species, and obtaining nutrients at the host's expense. Examples of saprophytes include bacteria, fungi, and yeasts that feed on decaying vegetation. Examples of parasites include the fungi Puccinia and the plant dodder, which attaches to and derives nutrients from host plants through specialized structures.

1. Distinguish between saprophytic and
parasitic modes of life.

2. Some bacteria feed on decaying
matter

3. Decay
to become decomposed; rot:
vegetation that was decaying.

4. decaying matter
like rotten trunk or leaves of plants.
We call these plants as host plants

6. • These nitrates are taken up
by plants roots and

7. • These nitrates are taken up by
roots and converted in to new
amino acids and proteins

8. •These saprotrophs
are also called
heterotrophs

9. Heterotrophs
• They are incapable of
manufacturing organic
compounds from simple
inorganic nutrients and so they
obtain organic molecules from
the environment in the form of
food.

10. • 'Sapros' refers to rotten and 'trophic' refers to
food

11. Examples of saprophytes
:
(plants which have saprotrophic
nutrition) are Rhizopus (bread
mould), Mucor (pin
mould), Yeast, Agaricus
(mushroom), many bacteria etc.

12. Parasitic Nutrition
Feeding by
living in an organism
Or
On organism (host)

13. Host
• Belongs to different species

14. • Is called Parasitic Nutrition

15. Examples of parasites
• Puccinia
• Dodder(Cuscuta)

16. • Puccinia is a genus of fungi

18. Dodder (leafless plant)

20. • After a dodder attaches itself to a
plant, it wraps itself around it. If
the host contains food beneficial
to dodder, the dodder produces
haustoria that insert themselves
into the vascular system of the
host.

21. • Dodder is parasitic on a very wide
variety of plants, including a
number of agricultural and
horticultural crop species
• E.g potatoes

22. • Horticulture is the
science, art, technology and business
involved in intensive plant cultivation
for human use. It is practiced from
the individual level in a garden up to
the activities of a multinational
corporation.

24. Why normal nutrition not possible in
parasite plants
• Some of these plants have no
chlorophyll and are entirely
dependent on the host for food
and water
• Others are green and can
produce some or all of their own
food.