Question

Though the basic unit of both a flower and leaf is cell, they are widely different in their
appearance. Why?

Answer 1

Hii mate here is the answer to your question
we all know, that the basic unit of a flower and leaf is cell but they are different in their appearances mainly due to the absence of the characteristic plastid in them . There are three types of plastids
chloroplastids, chromoplastids and leucoplastids. chloroplastids are the the duouble membraned cytoplasmic cell organelle containing pigment chloroplast which helps in photosynthesis and is present in green parts of the plant in the mesophyll of leaf whereas chromoplastid is responsible for imparting colour other than green to the parts of the plant example fruits, flowers etc.
hope this helps
keep smiling

Answer 2

The basic unit of a flower and leaf is cell but they are different in their appearances mainly due to the absence of the characteristic plastid in them . 3 types of plastids (chloroplastids, chromoplastids and leucoplastids). chloroplastids are the the double membraned cytoplasmic cell organelle containing pigment chloroplast which helps in photosynthesis and is present in green parts of the plant in the mesophyll of leaf whereas chromoplastid is responsible for imparting colour other than green to the parts of the plant example fruits, flowers

Hope it helps you :)