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11th Standard English Medium Biology (Botany) Subject Secondary Growth Creative 3 Mark Questions with Solution Part - II

Published on: 26/06/2021

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Std: 11th Standard - Biology

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

What is Turpentine?

List the differences between Vascular Cambium and Cork Cambium

What is Haematoxylin?

What are tylosoids?

What is Tyloses?

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Answers Key:

Generic 3

5 x 3 = 15

It is a resin got form the bark of Confiers. It is used as a thinner for oil based paints and organic solvents. Eg: Pinus

	Vascular cambium	Cork cambium
1.	Also called cambium	Also called phellogen
2.	It arises from procambium and interfascicular parenchyma in stems and from conjunctive parenchyma in roots	It arises from epidermis, cortex, phloem, or pericyle in both stems and roots
3.	It comprises long fusiform and short ray initials.	It comprises of homogenous cells.
4.	It produces secondary phloem towards the outer side and secondary xylem towards inner side.	It produces phellem( cork) towards outer side and phellodenn (secondary cortex) towards inner side.

The dye, haematoxylin is obtained from the heart wood of Haematoxylum campechianum used to stain plant materials for observation under microscope, especially the nucleus of the cell.

(i) In gymnosperms, the resin ducts are blocked by tylose like ingrowths from the neighbouring resin producing parenchyamatous cells. Eg: Pinus.
(ii) In angiosperms, the sieve tubes are blocked by tylose- like ingrowths from the neighbouring parenchyamatous cells. Eg: Bombax. These are called tylosoids

(i) In many dicot plants, the lumen of the xylem vessels is blocked by many balloonlike ingrowths from the neighbouring parenchymatous cells. These balloon-like structures are called tyloses.
(ii) Usually, these structures are formed in secondary xylem vessels that have lost their function i.e., in heart wood. In fully developed tyloses, starchy crystals, resins, gums, oils, tannins or coloured substances are found.