Question

ASSERTION: All living species of cycas are dioecious.
REASON: cycas contain male and female cones on same plant
A. If both assertion and reason are true and the reason is correct explanation of the assertion
B. If both assertion and reason are true but the reason is not the correct explanation of assertion
C. if assertion is true but the reason is false
D. If both the assertion and reason are false.

Answer 1

Hint: Diecious – male and female structures are on different plants; Monecious: male and female structures are on the same plant
Cycas is a gymnosperm with narrow smooth leaflets and cones at the ends of branches they are considered as pine trees or conifers because they have cones as their modifications and the leaves of cycas are similar to the pine trees and they live longer. They take a long time to grow as sexual reproduction is mostly seen every 10 years.

Complete answer:
ASSERTION: All the living species of cycas are diecious.
Cycas is a primitive flowering plant belonging to the family cycadaceae, the male and female gametocytes are seen in the form of spores called microsporophyll and megasporophyll they aggregate together in the form of a bunch called cones. In cycas family as both male and female cones on different plants hence all species of cycas are diecious
The assertion is true.
 REASON: cycas contain both male and female cones on the same plant.
As in assertion cycas species shows the diecious condition, not conscious condition then the reason must be male and female on a different plant not on the same plant.
The reason is false
So, the correct answer is “Option C”.

Note:
Cycas species are from the Jurassic and Cretaceous periods and they are distributed all around the world. Cycas revolute is highly prioritized in bonsai which means it can also be considered as the ornamental plant. This plant also holds cultural importance. The ingestion of cycas is toxic to the animal as well as living which could cause liver failure and cirrhosis.