What is a remnant structure?

Observe the diagram (a) Copy this diagram in your answer sheet and mark the following parts. Intine ,exine ,vegetative nucleus, generative cell . (b) What is this structure ? What is the ploidy of the given structure ?

What is the structure of BeCl_(2) ?

What are the structures present in the membranous labyrinth?

What are the structures involved in the protection of brain?

What are bond line structures? Give one example.

What are the structures involved in the excretory system of human? Write the structure of kidney with neat diagram.