Correct option is A
Explanation-
A. Two separate enzymes are involved in synthesis of ent-kaurene from GGDP in plants - True
In plants, two separate enzymes (ent-copalyl diphosphate synthase and ent-kaurene synthase) are involved in the conversion of GGDP (geranylgeranyl diphosphate) to ent-kaurene.
B. Only a single bifunctional enzyme catalyzes the synthesis of ent-kaurene from GGDP in fungi - True
In fungi, this reaction is catalyzed by a single bifunctional enzyme that performs both steps.
C. GA-biosynthesis genes are mostly clustered on a single chromosome in fungi - True
In fungi, the GA-biosynthesis genes are mostly clustered together on a single chromosome, often forming a gene cluster.
D. GA-biosynthesis genes are randomly located on chromosomes in fungi- False
This contradicts statement C. In fungi, the genes are not randomly located; they are clustered.
Correct option: a - A, B and C only
