The least porous soil among the following is a

Analogy type question:
$(1)$ Initial growth : Lag phase :: Rapid growth : .........
$(2)$ $IAA$ : Indole compounds :: Abscisic acid : .......

In which of the following respects do plant hormones differ from enzymes?

One hormone hastens the maturity period in juvenile conifers,a second hormone controls xylem differentiation,while the third increases the tolerance of plants to various stresses. They are respectively:

Where are the following hormones synthesized in plants?
$(a)$ $IAA$
$(b)$ Gibberellins
$(c)$ Cytokinins

Identify the partial parasite and total parasite plants,respectively,from the following.