Question

How many of the following plants given possess open(X) and closed vascular bundles (Y) respectively?
Brassica, Tulipa, Capsicum, Gloriosa, Nicotiana, Aloe, Cicer, Asparagus, Petunia, Colchicum, Sesbania, Zea.

• A. $X=6,Y=6$
• B. $X=4,Y=8$
• C. $X=5,Y=7$
• D. $X=9,Y=3$

Answer 1

Answer: (A)

$X=6,Y=6$

The dicotyledons, also known as dicots, are one of the two groups into which all the flowering plants or angiosperms were formerly divided. The name refers to one of the typical characteristics of the group, namely that the seed has two embryonic leaves or cotyledons. The vascular bundle in dicots is conjoint, collateral and open type, meaning there is presence of cambium. Monocotyledons commonly referred to as monocots, are flowering plants (angiosperms) whose seeds typically contain only one embryonic leaf, or cotyledon. The vascular bundle in monocot is conjoint, collateral and closed type. Cambium is absent in monocots. Since plants like Brassica, Capsicum, Nicotiana, Cicer, Petunia, and sesbania are dicots, they posses open type of vascular bundle. Plants like Tulipia, Gloriosa, Aloe, Asparagus, Colchicum, and Zea are monocot in nature. Hence they posses closed type of vascular bundles.

So the correct option is 'X=6,Y=6'.