Multiple Choice QuestionsSecondary xylem and phloem in dicot stem are produced by
Apical meristems
Vascular cambium
Axillary meristems
Phellogen
The term 'bark' refers to
Phellem, phelloderm and vascular cambium
Periderm and secondary xylem
Cork cambium and cork
Phellogen, phellem, phelloderm and Secondary phloem
What differentiates leaf of dicots from monocots?
Parallel venation
Differentiation of palisade and spongy parenchyma
Stomata only on upper side
Stomata both on upper and lower sides
B.
Differentiation of palisade and spongy parenchyma
Main differences between dicot and monocot leaves are as follows:
| Character | Dicot leaf | Monocot leaf |
| Type of leaf | Dorsiventral | Isobilateral |
| Stomata | Have more stomata on lower epidermis. | Have an equal number of stomata on upper and lower epidermis. |
| Mesophyll | Differentiated into 2 parts: upper palisade and lower spongy. | Undifferentiated |
| Bundle sheath | It is single layered and made up of parenchymatous cells. | It may be single or double layered and made up of sclerenchymatous cells. |
| Bulliform cells | Absent | Present; it helps in rolling and unrolling of leaves. |
| Venation | Reticulate | Parallel |
Duramen is present in
inner region of secondary wood
part of sap wood
outer region of secondary wood
region of pericycle
Meristematic tissue in vascular bundle is
phellem
procambium
interfascicular cambium
fascicular cambium
Quiescent centre is the zone of
least mitotic activity in the root apex
least mitotic activity in the shoot apex
maximum mitotic activity in the root apex
maximum mitotic activity in the shoot apex
Ectophloic siphonostele is found in
Adiantum and Cucurbitaceae
Osmunda and Equisetum
Marsilea and Botrychium
Dicksonia and maiden hair fem
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