MCQ
Collenchyma is
- ✓Living and contains protoplasm
- BDead and hollow
- CDead and filled with reserve food
- DLiving and lack nucleus
✓
Answer
Correct option: A.
Living and contains protoplasm
a
Collenchyma is a specialised supporting simple permanent tissue of living cells filled with protoplasm and characteristically possessing unevenly distributed thickenings of cellulose, pectin and hemicellulose on their wall.
Collenchyma is a specialised supporting simple permanent tissue of living cells filled with protoplasm and characteristically possessing unevenly distributed thickenings of cellulose, pectin and hemicellulose on their wall.
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(A) The outer walls of guard cells are thick and the inner walls are highly thickened.
(B) The stomatal aperture, guard cells and the surroundings subsidiary cells are together called stomatal apparatus.
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(D) All tissues except epidermis and vascular bundles constitute the ground tissues.
(E) In leaves, the ground tissue consists of thick- walled chloroplast containing cells and is called mesophyll.
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(G) Vascular bundles having close vascular bundles that possess the ability to form secondary xylem and phloem.
(H) In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissue they are referred as closed.
(I) In conjoint type of vascular bundles, the xylem. and phloem are situated at the same radius of vascular bundles.
(J) The conjoint vascular bundles usually have the phloem located only on the inner side of xylem.
(K) Endodermis is a multiple layers of barrel- shaped cells without any intercellular spaces in cortex in roots.
(L) The tangential as well as radial walls of the endodermal cells in cortex have a deposition of water impermeable, waxy material suberin in the form of casparian strips.
(M) The parenchymatous cells which lie between the xylem and phloem are called conjuctive tissue.
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