Question

A dicotyledonous plant showing parallel venation is
A. Dioscorea
B. Smilax
C. Calophyllum
D. Hibiscus

Answer 1

Hint: We need to study about dicots and monocots and the type of venation they possess. Monocotyledons and dicotyledons are distinguished by their roots, stems, leaves, flowers, and seeds. The fundamental distinction between monocotyledons and dicotyledons is that monocotyledons have only one cotyledon in their embryo, whereas dicotyledons have two.

Complete answer:
When all of a leaf's veins are parallel to each other, this is referred to as parallel venation. This is a common feature of monocot leaves, and it corresponds to their stretched leaf shape and wide leaf base. The veins in such leaves typically run parallel to one another from the base to the tip of the leaf. The veins form a parallel structure from the base to the tip of the leaf in parallel venation, resulting in a net-like pattern on both sides of the midrib. Pinnately and palmately are the two forms of parallel venation. The mid leaf part of pinnately parallel venation is varied, whereas the base and tip leaf section of palmately parallel venation is varied. Plants with parallel venation include monocots such as banana and bamboo.
In monocot leaves, the venation is parallel, whereas in dicot leaves, the venation is reticulated. There are a few exceptions, such as the dicot plants Calophyllum and Eryngium, which have parallel venation, and the monocot plant Smilax, which has reticulate venation.

Hence, the correct answer is option C.

Additional information:
Dioscorea has monocot leaves showing reticulate venation.
Hence, option A is incorrect.
Smilax has monocot leaves having reticulate venation.
Hence, option B is incorrect.
Hibiscus has dicot leaves having reticulate venation.
Hence, option D is incorrect.

Note:
Note that Calophyllum is an angiosperm plant belonging to the dicot family. Calophyllum is a genus of plants and shrubs. They create a latex that is colourless, white, or yellow. The leathery blades of the oppositely oriented leaves are often carried on petioles. The leaves have narrow parallel veins that alternate with resin canals, giving them a characteristic appearance.