BS Zoology Semester Exam | Page 71

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanMedium

In a specimen-based viva, the examiner describes this case: a Paramecium population increases by cell division but occasionally exchanges genetic material between paired individuals. Choose the concept that fits it best.

A. spore formation only B. binary fission and conjugation C. fragmentation only D. budding only

Correct Answer: B. binary fission and conjugation

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanHard

A learner makes a note: a large sponge has many flagellated chambers and a highly folded canal system that increases feeding surface area. The missing scientific idea is:

A. leuconoid canal system B. simple sac plan C. radial canal only D. asconoid canal system

Correct Answer: A. leuconoid canal system

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanMedium

For semester exam preparation, consider this situation: a reef-building animal contributes to a hard limestone structure in warm marine water. The correct conclusion is:

A. corals possess radula B. corals use malpighian tubules C. corals have jointed appendages D. corals secrete calcium carbonate skeletons

Correct Answer: D. corals secrete calcium carbonate skeletons

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanHard

During a Zoology practical, a tiny aquatic pseudocoelomate attaches temporarily to surfaces using posterior adhesive structures. Select the most accurate identification.

A. tube feet B. parapodia C. adhesive tubes D. jointed legs

Correct Answer: C. adhesive tubes

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanHard

While comparing invertebrate groups, a minute marine worm has a retractable head bearing spiny structures used in movement through sediment. The feature being tested is:

A. tube feet on arms B. radula on a tongue C. setae on parapodia D. scalids on an introvert

Correct Answer: D. scalids on an introvert

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanEasy

A lab observation notes that freshwater protozoans repeatedly collect and expel excess water from the cell. The observation points to:

A. nucleus B. contractile vacuole C. food vacuole D. pellicle

Correct Answer: B. contractile vacuole

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanMedium

Mobile amoeboid sponge cells digest food, transport nutrients, and can develop into other cell types. The best answer is:

A. archaeocytes B. ommatidia C. cnidocytes D. malpighian cells

Correct Answer: A. archaeocytes

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanMedium

A diagram in the course handout shows that after fertilization in many cnidarians, a ciliated larval stage swims before settlement. Identify the related structure or process.

A. veliger larva B. trochophore larva C. glochidium larva D. planula larva

Correct Answer: D. planula larva

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanHard

A student is revising Animal Diversity-I: a small meiofaunal animal glides across sediment using cilia on its lower surface. What should the student write in the answer sheet?

A. radula B. ciliated ventral surface C. madreporite D. nematocysts

Correct Answer: B. ciliated ventral surface

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanHard

In museum study, a marine meiofaunal animal shows a spiny, ringed trunk under high magnification. The specimen or feature is best linked with:

A. segmented trunk with spines B. colloblasts C. water vascular system D. calcareous shell

Correct Answer: A. segmented trunk with spines

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanEasy

For semester exam preparation, consider this situation: amoeba surrounds a food particle with cytoplasmic extensions and encloses it inside a vacuole. The correct conclusion is:

A. radular scraping B. molting C. filter feeding by choanocytes D. phagocytosis

Correct Answer: D. phagocytosis

BS Zoology Semester Exam Animal Diversity-I (Invertebrates)PakistanMedium

During a Zoology practical, a sponge broken into small pieces can reorganize living cells into a functional individual. Select the most accurate identification.

A. torsion B. cephalization C. regeneration D. metamorphosis

Correct Answer: C. regeneration

BS Zoology Semester Exam MCQs