Question

characteristics of stem​

Answer 1

Answer:

simple and modifyed stem

Answer 2

Answer:

Characteristics of Stem:

• The aerial part of the plant body is collectively described as shoot system
• Main axis of this shoot system is called the stem
• Stem is the ascending part of the plant axis developing from the plumule
• Stem is differentiated into nodes and internodes. Its bears leaves and branches at the nodes
• Its positively phototropic
• Negatively geotropic
• The young stem is green and is performing photosynthesis

• Stem arises as a prolongation of plumule (one end of an embryo).
• The shoot system is heterogeneous and consists of stem, branches, leaves, and flowers.
• The stem is negatively geotropic (moves above the soil), negatively hydrotropic (moves away from the water) and positively phototropic (moves towards the light).
• The stem bears nodes and internodes. The regions of the stem where leaves are born are called nodes while internodes are the portions between two nodes.
• The stem bears vegetative buds which could be terminal (apical bud) for the plant to grow upwards or axillary (bud in the axil of the leaf) which give rise to lateral branches. The stem bears floral buds (terminal or axillary) that grow into flowers
• The young stem is green in colour and thus it is photosynthetic. The mature stem is generally green when young and later often become woody and dark brown.
• Lateral branches of the stem are exogenous in origin.

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Explanation:

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