Algal Bloom and Red Tides — NEET Biology
📚 Practice ConceptFind out what do the terms 'algal bloom' and 'red-tides' signify.
Assertion (A): Red tides occur when the sea appears red due to algal blooms. Reason (R): Rapid multiplication of red dinoflagellates like Gonyaulax causes the sea to appear red.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
Both statements are true from NCERT. Red tides do make the sea appear red (Assertion true). NCERT states “Very often, red dinoflagellates (Example: Gonyaulax) undergo such rapid multiplication that they make the sea appear red (red tides).” The Reason explains the CAUSE of the red tide phenomenon described in the Assertion - the rapid multiplication of red dinoflagellates.
What does NCERT say about Find out what do?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.