State reasons for the following:
$(a)$ Bryophytes are called amphibians of the plant kingdom.
$(b)$ Gymnosperms are called so (naked-seeded plants).
$(c)$ Birds have wings and feathers.

(N/A) Bryophytes are called amphibians of the plant kingdom because they live on land but require water for fertilization,as their male gametes are motile and need a water medium to reach the female gametes.
$(b)$ Gymnosperms are called so because the term 'Gymnosperm' is derived from Greek words 'gymnos' meaning naked and 'sperma' meaning seed. They produce seeds that are not enclosed within an ovary or fruit.
$(c)$ Birds have wings and feathers to facilitate flight. Wings provide the necessary surface area for lift,while feathers help in streamlining the body,maintaining body temperature,and providing the aerodynamic structure required for flying.