Biological Classification Test 6 – MCQs with Answers and Explanation

Biological classification is an important chapter in Class 11 Biology that deals with the grouping of organisms based on their characteristics. This chapter plays a crucial role in both board exams and competitive exams like NEET. The following test includes important multiple-choice questions based on Mycoplasma, cyanobacteria, diatoms, fungi, and Protista. Practicing these questions will help you strengthen your understanding and improve accuracy in exams.

The first question asks about a correct statement related to Mycoplasma. The correct answer is that Mycoplasma are the smallest living cells known. They are unique because they lack a cell wall and can survive in different environments. The second question focuses on cyanobacteria, and the correct answer is Nostoc, which is a well-known example of nitrogen-fixing cyanobacteria.

The third and fourth questions are based on diatoms. The correct answer is that diatoms have silica-embedded cell walls. These cell walls form beautiful patterns and are made of silica, which is a key identifying feature. Diatoms are also important contributors to marine ecosystems and oxygen production.

The fifth question asks about the type of spore formed by fungi during unfavorable conditions. The correct answer is oospore, which helps fungi survive harsh environmental conditions. The sixth question highlights a distinguishing feature of dinoflagellates. The correct answer is that they have two flagella arranged in different orientations, which helps in movement.

The seventh question asks for an incorrect statement about Mycoplasma. The correct answer is that Mycoplasma contain peptidoglycan in their cell walls, which is incorrect because they do not have a cell wall at all. The eighth question focuses on the gelatinous sheath of cyanobacteria. The correct answer is protection and buoyancy, as it helps them survive in aquatic environments.

The ninth question is about locomotion in certain protists. The correct answer is amoeboids, which use pseudopodia for movement and capturing food. The tenth question again focuses on diatoms, and the correct answer is that they have silica-embedded cell walls.

Overall, this test covers important and frequently asked concepts from biological classification. Regular practice of such MCQs will help you build strong fundamentals and improve your performance in exams. It is always recommended to revise NCERT thoroughly and solve more practice questions for better accuracy and confidence.