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Standard XII
Biology
Rhizome
Rhizomes can ...
Question

Rhizomes can be differentiated from roots by

A
Having scale leaves with axillary buds
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B
Being thinner
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C
Being thicker
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D
Being darker
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Solution

The correct option is D Having scale leaves with axillary buds
Rhizome is a modified stem of a plant that grows horizontally underground. The roots and shoots grow from nodes of rhizomes. They are also called as creeping rootstocks. The nodes of rhizomes have dry scale leaves with axillary buds. They show sympodial growth meaning they have a specialized lateral growth pattern in which the apical meristem is terminated and make it different from the roots.
Therefore, the correct answer is A.

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Q. From the description given below, identify the type of plant modification.
A thick horizontally growing stem which usually stores food material. It has nodes and internodes, scale leaves, axillary buds, adventitious roots and a terminal bud.
Q. Given are some difference between an underground stem and a root. Select the option that identifies the incorrect pair of differences.
Underground stemRoot
(i)It is differentiated into nodes and internodesit is not differentiated in to nodes and internodes.
(ii)Scale leaves are present at the nodes.Scale leaves are absent in roots.
(iii)Axillary buds are present in the axil of scale leaves.Axillary buds are present at root tips.
(iv)Branches arise exogenously.Branches arise endogenously.
(v)Flowers and fruits absent
Flowers and fruits are absent.
(vi)These usually perform the function of food storage.These usually perform the function of food storage.

Q. Match the columns and choose the right option.
1.Pneumatophores(a)Axillary buds
2.Tendrils in pea(b)Roots
3.Thorns in citrus(c)Leaves

Q. Match column I with column II and select the correct option from the given codes.
Column I Column II
A. Vegetative buds i. Buds develop in axils of leaves
B. Floral buds ii. Buds produce leafy shoots
C. Axillary buds iii. Reproductive buds that produce flowers
D. Accessory iv Additional buds borne at leaf bases

Q. Read the following statements.

(i) In Limnophila heterophylla, the lamina of submerged leaves is very much dissected while the lamina of aerial leaves is entire. This variation in the form of lamina is referred to as ___________.
(ii) Patoto tubers, when exposed to light, turn green due to the increased production of a glycoalkaloid named ____________.
(iii) In ___________, ovary arise from the bottom of the cup-shaped thalamus and androperianth arises the rim of the cup-shaped thalamus.
(iv) Underground stems can be differentiated from roots by ___________ of axillary buds on the nodes.
Select the correct fill-ups out of the following for the above statements.

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