Plant Secondary Growth

State Council of Educational Research and Training, Tamil Nadu (2020) Plant Secondary Growth. [Teaching/Learning Resource]

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We have studied in the previous chapters the primary internal structure of monocots and dicots. If you look at the stem of grass (monocot), it is soft, whereas in the neem (dicot), the stem is very hard and woody, why? It is the secondary growth which Unit IV: Plant Anatomy (Structural Organisation) confers the hardness to wood of dicot stems and roots. In monocots, usually there is no secondary growth and so they are soft. The increase in girth is called secondary growth or growth in girth and we shall discuss the details of secondary growth in this chapter. The plant organs originating from the apical meristems pass through a period of expansion in length and width. The roots and stems grow in length with the help of apical meristems. This is called primary growth or longitudinal growth. The gymnosperms and most angiosperms, including some monocots, show an increase in thickness of stems and roots by means of secondary growth or latitudinal growth.

Item Type: Teaching/Learning Resource
Program: A publication under Free Textbook Programme of Government of Tamil Nadu
Learning outcomes: The students should be able to, • Analyze primary and secondary growth. • Discuss the increase in length and width of the plant. • Explain secondary growth in dicot stems. • Explain secondary growth in dicot roots.
Access: Open
Uncontrolled Keywords: Plant Anatomy
Subjects: Biology
Curriculam Level: 5. Senior Secondary
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Depositing User: COL Staff
Date Deposited: 11 Apr 2021 03:52
Last Modified: 22 Apr 2021 00:22

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