Question

Assertion :Leucosolenia shows ascon type of canal system Reason: In Leucosolenia water passes through ostia$\to$ spongocoel $\to$ osculum.

• A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
• B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
• C. If the assertion is true but the reason is false
• D. If both the assertion and reason are false

Answer 1

The correct option is A If both the assertion and the reason are true and the reason is a correct explanation of the assertion

Leucosolenia shows the simplest (ascon) type of canal system. In this surrounding water enters the canal system through ostia. The sea water then enters into the spongocoel and pushed out readily through osculum. The course is taken by the water current in the body of sponge may be shown as under.
Ingressing $\underset{Ostia}{\overset{Through}{\to }}$ Spongocoel $\underset{Osculum}{\overset{Through}{\to }}$ To outside.

So, the correct answer is 'If both the assertion and the reason are true and the reason is a correct explanation of the assertion'.