Assertion (A): Protozoans and diatoms belong to the kingdom Protista.
Reason (R): Protozoans and diatoms are parasitic forms.
Directions: Choose the correct option:Correct answer: (c) Assertion(A) is true and reason(R) is false.
Protozoans usually show heterotrophic nutrition (mostly parasitic) while diatoms show autotrophic nutrition.
Hence, the correct option is (c).