plants and information

2. Spirogyra, which is a filamentous green algae
reproduces rapidly by this asexual mode of
nutrients in water. The filaments breaks up
into a number of short segments, due to
force of water current or friction. Each
segment then develops into a complete
organism and the process continues. You
might have noticed such green algae covering
ditches or ponds as slimy green scum over
large areas.

4. The spores are asexual reproductive bodies
found in plant groups like fungi, mosses and
ferns. If a piece of bread is kept in a warm
and moist place, mass of fine thread – like
structures which are the hyphae grow form
the spores after they have settled on it.
Spores are produced in large number and are
very light and minute. Under favorable
condition of moisture and temperature, they
germinate in suitable medium into a new
individual.

6. This type of reproduction is observe is higher
plant groups. New plants are produced from
vegetative parts of the parent plant like
roots, stem or leaves. Thus there is no
involvement of flower, the reproductive part.
These specialized organs of propagation
often have vegetative buds which develop
into shoots. Some of these like potato and
ginger also store food and are means of
survival is adverse cold and drought
conditions.

8. The runner arises as an axillary bud. It creeps
horizontally some distance away form the
mother plant, then strikes roots at the nodes
and grows into a new plant. It may break off
form the mother plant and grow as
independent plant. The most common
example is grass.

10. Tuber is the swollen end of a special under
ground stem. It arises for the axil of a lower
leaf becomes swollen with heavy store of
food material. It has on its surface a number
of ‘eyes’ that grow into buds. A potato is an
example of tuber.

12. Rhizome is horizontally growing underground
stem, swollen with stored food. A rhizome
bears distinct nodes, internodes, scaly leaves
and adventitious roots. It has buds on its
surface from which grow new plants. Ginger
and turmeric are examples.

14. In Bryophyllum, rows of foliar buds are
produced on the notch at the end of leaf
margins. These buds may drop from the leaf
and grow up into mew plants.

16. Root tubers are swollen adventitious roots.
Examples are dahlia and sweet potato. These
roots have food stored in them. If root tuber
of sweet potato is cut into pieces and sown in
well prepared soil, a new plant can be
produced.

18. ☻ New plants are produced in less time
☻ The plants produced are exact copies of the
parent plant
☻ Plants propagated vegetatively usually need
less attention than plants grown from seeds

19. Man has taken advantage of the vegetative
mode of propagation in plants and adapter
them to his use in gardens and nurseries.
These man-made methods are called artificial
propagation. They are Cutting, Grafting and
Layering.

20. Cutting is a simple procedure in which a
healthy, young branch of a plant like rose and
sugar cane having nodes and internodes is
cut off and planted in moist soil. It produces
roots and grows in to a new plant.

22. This method used in horticulture, to develop
new varieties of fruits plants. In this
method, a healthy stem of one plant with
oblique cut surface is inserted over the cut
stem of another rooted plant. It is then tied
together. After some days, new braches
develop that show combined feature of the
two plants.

24. In this method, a branch of the plant is bent
towards the ground and covered by moist
soil. After sometime, roots develop form the
covered part. The bent branch is later cut and
made to grow into a new plant. Plants like
jasmine and bougainvilleas are developed by
this method.

27.  Keep it cool… by that I mean NO FIGHTING!!!
 You have 1min to discuss amongst your
group
 Each team will get 1 Question
 The person asked should answer the question