Anatomy of a Leaf MCQ - Practice Questions with Answers

Anatomy of Leaf

Main features of the anatomy of leaf: 

• The epidermis is single layered. There is an upper epidermis and a lower epidermis.
• Cutin is present in the outer cell walls of the epidermal cells.
• Petiole has either sclerenchymatous or collenchymatous hypodermis.
• The ground tissue is made up of parenchymatous cells. These are called mesophyll cells.
• The mesophyll tissue is present between the upper and lower epidermis.
• The vascular bundles are conjoint, collateral and closed.
• Xylem faces the adaxial surface (upper surface).
• Phloem faces the abaxial surface (lower surface).
• In the leaves of xerophytes, the epidermis is multiseriate and stomata are sunken.
• In the C4 plants, bundle sheath is present around the vascular bundles.

Dicot Leaf:

• The dicot leaves are called dorsiventral leaves. 
• Their mesophyll is differentiated into two zones. 
• The upper zone is columnar and compactly arranged cells called palisade parenchyma cells.
• The lower zone is made of loosely arranged cells called spongy parenchyma.
• It is also called bifacial leaf.
• Guard cells are kidney shaped.

Monocot Leaf:

• The monocot leaves are called isobilateral leaves. 
• Their mesophyll is uniform. 
• It is also called unifacial leaf.
• Bulliform cells are seen in some monocot leaves.
• Stomata are present on both sides (amphistomatic).
• Guard cells are dumbbell shaped.