corolla-flower

Question 1

second whorl of flower

Answer 1

corolla
unit-petals
attracts insect for pollination

Question 2

aestivation

Answer 2

arrangements of sepals or petals in bud condition w.r.t other member of same whorl
type - valvate , twisted, imbricate

Question 3

valvate aestivation

Answer 3

not overlapped by anyone 
liliaceae
solanacea 
cruciferae
calotropis

Question 4

twisted aestivation

Answer 4

one margin overlapped and the other overlaps other

eg. Malvaceae family (cotton(gossypium), china rose , lady finger )

Question 5

Imbricate aestivation

Answer 5

one completely overlapped, other completely outside , rest twisted

Question 6

type of imbricate aestivation

Answer 6

ascending imbricate

descending imbricate or vexillary

Question 7

Ascending imbricate aestivation and eg.

Answer 7

posterior part is innermost

eg. cassia , gulmohar

Question 8

Descending imbricate aestivation or vexillary

Answer 8

standard/ vexillum(posterior and largest )
wings/alae
carina /keel
eg. pea bean ,pappilonatae / fabaceae