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Question
In the diagram of the T.S. of HeIianthus stem given below, certain parts have been indicated by alphabets choose the answer in which these alphabets have been correctly matched with the parts which they indicate.
In the diagram of the T.S. of HeIianthus stem given below, certain parts have been indicated by alphabets choose the answer in which these alphabets have been correctly matched with the parts which they indicate.
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Solution
The correct option is B A - Epidermal hairs, B - Epidermis, C - Hypodermis (Collenchyma), D - Parenchyma, E - Starch sheath, F - Bundle cap, G - Vascular bundle, H - Cambium, I - Medulla or pith
Helianthus is a dicotyledonous stem.
A shows hair like structures i.e. hairs of epidermal cells. Hence called as epidermal hairs. These are multicellular projections of epidermal cells.
B is showing the outermost layer of the dicot stem i.e. epidermis. It has protective function. It is made of single layered, compactly arranged parenchymatous cells.
C is showing layer below the epidermis. It is called as hypodermis which is made of collenchymatous cells. It gives mechanical support to the stem.
D is showing wide layer below hypodermis. It is cortex made of loosely arranged parenchymatous cells. These cells may contain chloroplast or can serve the food storage functions.
E is showing the layer below cortex. It is called as endodermis and is made of parenchymatous cells. These cells are rich in starch hence, called as starch sheath.
F is showing the crescent shaped layer. It is pericycle which is made of partly of parenchymatous and sclerenchymatous cells. These crescent shaped patches are present outside the vascular bundles hence, called as bundle cap.
G is showing vascular bundle. Vascular bundle of HeIianthus is of conjoint, collateral and open type. Vascular bundle has a patch of xylem towards center and a patch of phloem towards periphery.
H is showing the cambium of vascular bundle. Cambium is present in between a patch of xylem and a patch of phloem.
I is showing the central part of the stem i.e. pith. It consists of loosely arranged parenchymatous cells.
Thus, the correct answer is option B.
Helianthus is a dicotyledonous stem.
A shows hair like structures i.e. hairs of epidermal cells. Hence called as epidermal hairs. These are multicellular projections of epidermal cells.
B is showing the outermost layer of the dicot stem i.e. epidermis. It has protective function. It is made of single layered, compactly arranged parenchymatous cells.
C is showing layer below the epidermis. It is called as hypodermis which is made of collenchymatous cells. It gives mechanical support to the stem.
D is showing wide layer below hypodermis. It is cortex made of loosely arranged parenchymatous cells. These cells may contain chloroplast or can serve the food storage functions.
E is showing the layer below cortex. It is called as endodermis and is made of parenchymatous cells. These cells are rich in starch hence, called as starch sheath.
F is showing the crescent shaped layer. It is pericycle which is made of partly of parenchymatous and sclerenchymatous cells. These crescent shaped patches are present outside the vascular bundles hence, called as bundle cap.
G is showing vascular bundle. Vascular bundle of HeIianthus is of conjoint, collateral and open type. Vascular bundle has a patch of xylem towards center and a patch of phloem towards periphery.
H is showing the cambium of vascular bundle. Cambium is present in between a patch of xylem and a patch of phloem.
I is showing the central part of the stem i.e. pith. It consists of loosely arranged parenchymatous cells.
Thus, the correct answer is option B.
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