GUJCET 2019 Biology Solved Paper

Which option is correct for the statements 'X', 'Y'
and 'Z' givben below:
Statement-X: A forest in a tropical region like
Equadar has upto 10 times as many species of
vascular plants as a forest of equal area in temperate
region
Statement-Y: Temperate regions subjected to
freuqent glaciations in the past, tropical latitudes
have remainded relatively undisturbed for millions of
years.
Statement-Z: In tropical area, productivity is high.