Algae Classification & Reproduction — NEET Biology
📚 Practice ConceptPlant kingdom includes algae, bryophytes, pteridophytes, gymnosperms and angiosperms. Algae are chlorophyll-bearing simple, thalloid, autotrophic and largely aquatic organisms. Depending on the type of pigment possessed and the type of stored food, algae are classified into three classes, namely Chlorophyceae, Phaeophyceae and Rhodophyceae. Algae usually reproduce vegetatively by fragmentation, asexually by formation of different types of spores and sexually by formation of gametes which may show isogamy, anisogamy or oogamy.
Assertion (A): Algae play a major role in global carbon dioxide fixation. Reason (R): Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic organisms.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
NCERT states “At least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis,” making the Assertion true. NCERT defines “Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic organisms.” The Reason explains WHY algae can fix CO2 - being autotrophic with chlorophyll enables photosynthetic CO2 fixation. This shifts from structural definition to ecological function.
What does NCERT say about Plant kingdom includes algae?
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.