What is correct for monocotyledons?
Important Questions on Anatomy of Flowering Plants
(i) Secondary growth usually occurs in monocotyledons
(ii) Bark refers to all tissues interior to vascular cambium
(iii) Lenticels permit the exchange of gases between the outer atmosphere and the internal tissue of the stem
(iv) Annual rings give an estimate of the age of the tree
Which of the following characters is/are related to dorsiventral leaf?
(a) Stomata are present on adaxial epidermis.
(b) Mesophyll is differentiated into palisade tissue and spongy parenchyma.
(c) Certain adaxial epidermis cells along the vein modify themselves into large empty colorless cells.
Select the incorrect statements from the given below.
(i) The parallel venation in monocot leaves is reflected in the near sizes of vascular bundles except in the main vein.
(ii) Starch sheath is present in root endodermis with Casparian strips on tangential and radial walls.
(iii) Conjunctive tissue is parenchymatous cells, which lie between the xylem and phloem in the dicot root.
(iv) In maize stem, vascular bundles are scattered in ground tissue with smaller towards the center and larger towards the periphery.
Match the following and choose the correct option from below.
| A. Meristem | (i) Photosynthesis, storage |
| B. Parenchyma | (ii) Mechanical support |
| C. Collenchyma | (iii) Actively dividing cells |
| D. Sclerenchyma | (iv) Stomata |
| E. Epidermal tissue | (v) Sclereids |
| (i) | Root hair | Unicellular |
|---|---|---|
| (ii) | Stem hair | Multicellular |
| (iii) | Trichomes | Cause water loss |
| (iv) | Guard cells | Regulate opening and closing of stomata |
Statement 1 Anatomically, all the tissues present on the inner side of endodermis such as pericycle, vascular bundles and pith constitute the stele.
Statement 2 Eustele is the stele in which vascular bundles are arranged in the form of a ring as present in dicot stems.
(i) Multicellular epidermal hair
(ii) Collenchymatous hypodermis
(iii) Pith present
(iv) Vascular bundles present in a ring i.e., eustele
Above given features describe which of the following plant parts?
| Characters | Monocot root | Dicot root | |
|---|---|---|---|
| (i) | Vascular bundle | Polyarch i.e., more than 6 vascular bundles | Diarch to hexarch i.e., 2 - 6 vascular bundles |
| (ii) | Cambium | Absent | Present, so secondary growth occurs |
| (iii) | Pith | Poorly developed | Well developed large pith |
| (iv) | Activity of pericycle | Gives rise to secondary roots and cork cambium | Gives rise to lateral roots only |
Identify the incorrect differences and select the correct option.
