Which one of the following is most appropriately defined ?

Examine the figures (A-D) given below and select the right option out of (a – d), in which all the four structures A, B, C and D are identified correctly.

Study the pathway given below: In which of the following options correct words for all the three blanks A, B and C are indicated?

Aestivation of petals in the flower of cotton is correctly shown in