What is the function of intermediate hosts or vectors in the life cycle of parasites?

What is the function of intermediate hosts or vectors in the life cycle of parasites?
  1. To spread the parasite to other hosts
  2. To reduce the survival, growth, and reproduction of the host
  3. To facilitate parasitisation of the primary host
  4. To make the host physically weak

Solution

Darwin notes that the life cycles of parasites often involve one or two intermediate hosts or vectors to facilitate parasitisation of the primary host.

Asked in: NCERT

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