Question

Select a money-plant. Cut some pieces such that they contain at least one leaf. Cut out some other portions between two leaves. Dip one end of all the pieces in water and observe over the next few days.
(I) The portion of money-plant which grow and give rise to fresh leaves are those which have
(a) buds
(b) spores
(c) flowers
(d) nodes
(II) Which parts of a plant develop into new plants by vegetative propagation?

(III) What conclusions can be drawn from the above activity?
(IV) What are the advantages of vegetative propagation?​

Answer 1

Explanation:

The portion of money-plant having leaves at the node show formation of fresh leaves. It also shows formation of branch from axillary buds present in the exile of the leaf.

2. Green leaves can sysnthesise food and have the ability to grow into a plant, through vegetative propagation.

Answer 2

Answer:

(I) (d) nodes

(II) The parts of a plant that develop into new plants by vegetative propagation are stems, shoot nodes, roots, leaves, tubers, stolons, bulbs, and rhizomes.

• Buds are formed at the nodes of the stems. For example, runners.
• Tubers (swollen modified roots) also give new plants through vegetative propagation. Buds form at the base of the stem.
• Leaves of a few plants separate from the parent plant and give rise to new plants.
• Leaves and flowers produce from the apical bud in the centre of the bulb. The lateral bud produces shoots.

(III) The above activity concludes that fresh leaves produce on that piece in which nodes are present on the stem. The shoot node is the part of the plant which can reproduce through vegetative propagation and give rise to a new plant.

(IV) The advantages of vegetative propagation are -

• It is a rapid method of reproduction.
• A large number of plants can be grown in a short interval of time.
• It is easier and cheaper.
• Seedless plants can be grown by artificial vegetative propagation such as grafting and cutting methods.
• Desirable characters can be preserved through successive generations. Hence, superior quality can be maintained.
• The survival rate is 100% in vegetative propagation.

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