Question

Obligate parasites are those organisms which

(a) live only on living host

(b) are essentially parasites but can also become saprophyte

(c) live only on dead and decaying organic matter

(d) are essentially saprophytes but can also becomes parasites.

Answer 1

Correct option (a) live only on living host

Explanation :

Obligate parasites can grow only upon suitable living host tissues. The best examples of obligate parasites are the causal organisms of downy and powdery mildews as Perenospora and Erysiphe.