Question

Animals with cleidoic eggs show

• A. External fertilization, internal development
• B. Internal fertilization, internal development
• C. External fertilization, external development
• D. Internal fertilization, external development

Answer 1

The correct option is D Internal fertilization, external development

Cleidoic egg is enclosed by a shell which effectively isolates it from the outside environment and prevents the loss of moisture. In organisms like amphibians fertilization takes place externally (in water) hence their eggs are not cleidoic as due to being present in water, they do not lose moisture. While land-dwelling animals evolved cleidoic eggs which aids in the prevention of eggs from losing moisture. These animals, after internal fertilisation, lay their eggs externally.

So, the correct option is 'Internal fertilization, external development'.