A learner makes a note: euglena survives in light by photosynthesis but can also absorb nutrients in darkness. The missing scientific idea is:
Correct Answer: D. mixotrophic nutrition
MCQ Collection
Animal Diversity-I (Invertebrates) MCQs
Practice Animal Diversity-I (Invertebrates) questions with answers and explanations.
A lab observation notes that a flattened animal has three germ layers but no body cavity between the gut and body wall. The observation points to:
Correct Answer: B. acoelomate body plan
For semester exam preparation, consider this situation: a roundworm has a fluid-filled cavity that is not completely lined by mesoderm. The correct conclusion is:
Correct Answer: C. pseudocoelom
A diagram in the course handout shows that in a dissected annelid, the body cavity is fully lined with mesodermal tissue. Identify the related structure or process.
Correct Answer: D. coelom
While comparing invertebrate groups, a developing embryo forms ectoderm, mesoderm, and endoderm. The feature being tested is:
Correct Answer: B. triploblastic organization
In museum study, an embryo develops a mouth from or near the blastopore during early development. The specimen or feature is best linked with:
Correct Answer: C. protostome development
A learner makes a note: an echinoderm embryo forms the anus from the blastopore and the mouth later. The missing scientific idea is:
Correct Answer: D. deuterostome development
A syllabus groups Porifera, Cnidaria, Mollusca, Annelida, Arthropoda, and Echinodermata at the same major rank. The best answer is:
Correct Answer: B. phylum
During a Zoology practical, a flatworm shows concentration of nervous tissue and sensory organs at the anterior end. Select the most accurate identification.
Correct Answer: D. cephalization
A student is revising Animal Diversity-I: two animals have appendages with the same evolutionary origin but different present-day functions. What should the student write in the answer sheet?
Correct Answer: C. homologous structures
In a specimen-based viva, the examiner describes this case: insect wings and bird wings both support flight but evolved independently. Choose the concept that fits it best.
Correct Answer: C. analogous structures
A lab observation notes that a zoologist identifies a digestive tract, excretory organs, and reproductive organs working together in one animal. The observation points to:
Correct Answer: D. organ-system level of organization