A.

GA

Gibberellins (GA) were first isolated from the fungus Gibberella fujikuroi the causal organism of foolish seedling disease of rice plants in Japan by kurasawa in 1926.

D.

Mango

In mango, coconut, plum, etc., the fruit is known as drupe (stony fruit).They develop from monocarpellary, superior ovaries and are one seeded. In mango, the pericarp is well differentiated into an outer thin epicarp, a middle fleshy edible mesocarp and an inner stony hard endocarp.

C.

Etiolated

Etiolation is a process in which flowering plants are grown in the parital or complete absence of light. Etiolation is mainly characterised by long and weak steam and smaller, sparse pale yellow colour (chlorosis) leaves due to longer internodes.

A.

Avena coleoptile curvature

Auxin is a phytohormone that is often bioassayed by Avena coleoptile curvature test. The angle of curvature of a decapitated oat coleoptile is measured after placing an agar block containing auxin on one side. The ability of auxin to stimulate shoot growth is then measured.

D.

gibberellin

Gibberellin induces aleurone cells to secrete an enzyme to break stored food in the seed. Cytokinines promote nutrient mobilisation, which helps in the delay of leaf senescence. 
ABA plays an important role in seed development, maturation and dormancy. Ethylene induces fruit ripening, breaks seed dormancy.