Question 1

Select the group in which all organisms have the same mode of nutrition.
(A) Cuscuta, yeast, legumes, leeches and tapeworm
(B) Cactus, ticks, lice, leeches and cow
(C) Cuscuta, ticks, lice, leeches and tapeworm
(D) Cactus, grass, lice, lion and tapeworm

Answer:

Option C – Cuscuta, ticks, lice, leeches and tapeworm

Explanation:

• Cuscuta → a parasitic plant (depends on host for food).

• Ticks → external parasites (suck blood of animals).

• Lice → parasites on human scalp or body.

• Leeches → suck blood of animals (parasites).

• Tapeworm → internal parasite in the intestine of animals.

👉 All of them obtain food from their host and cannot prepare food themselves.
👉 Hence, they all show heterotrophic – parasitic mode of nutrition.