Question

In Pinus, needle vascular bundles are

• A. Conjoint collateral and open
• B. Collateral and closed bicollateral
• C. Amphicribal
• D. Radial

Answer 1

The correct option is B Collateral and closed bicollateral

Cuticle is very thick. Epidermis is single layered. Pinus needle has well-developed sclerenchymatous hypodermis to check transpiration. Mesophyll cells are called armed parenchyma. Endodermis is single layered with casparian strips. Pericycle is large and located inside the endodermis. There are two conjoint and closed vascular bundles lying in the center of the pericycle. Hence, the correct answer is option B.