Chapter Exam

Unit 3A: Musculo-Skeletal System — Online MCQ Test

Q: Which of the following is the main mineral component of bone?

Answer: A. Calcium phosphate — Bones are hardened mainly by calcium phosphate deposited in the bone matrix. This gives bone its strength and rigidity.

Q: The joint present between the atlas and axis vertebrae is a/an:

Answer: B. Pivot joint — The atlanto-axial joint is a pivot joint that allows rotation of the head from side to side.

Q: The sliding filament theory explains muscle contraction by the interaction between:

Answer: A. Actin and myosin filaments — During contraction, actin filaments slide over myosin filaments, shortening the sarcomere.

Q: In the sliding filament theory, the length of which structure remains constant during contraction?

Answer: A. A band — The A band remains constant because the thick myosin filaments do not change in length during contraction.

ZOOLOGY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 3A: Musculo-Skeletal System with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR ZOOLOGY. This chapter covers: Focusing on human movement this chapter details skeletal system architecture bone joints muscle contraction mechanics sliding filament theory and musculoskeletal disorders.. AI-generated questions from basic to board-exam level, with instant results and explanations.

Questions

20m

Time Limit

Attempts Left

10 random questions from this chapter (mixed difficulty)
Questions you've seen before won't repeat until the pool resets
You have 20 minutes — exam auto-submits when time is up
Maximum 3 attempts per chapter
Results and explanations shown immediately after submission

New here? Register free — includes 3 free chapter exams.

Unit 3A: Musculo-Skeletal System — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR ZOOLOGY — Unit 3A: Musculo-Skeletal System, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the main mineral component of bone?

A. Calcium phosphate ✓
B. Sodium chloride
C. Potassium iodide
D. Magnesium sulfate

Answer: A. Calcium phosphate
Bones are hardened mainly by calcium phosphate deposited in the bone matrix. This gives bone its strength and rigidity.

The joint present between the atlas and axis vertebrae is a/an:

A. Hinge joint
B. Pivot joint ✓
C. Ball and socket joint
D. Gliding joint

Answer: B. Pivot joint
The atlanto-axial joint is a pivot joint that allows rotation of the head from side to side.

The sliding filament theory explains muscle contraction by the interaction between:

A. Actin and myosin filaments ✓
B. Calcium and phosphorus
C. Ligaments and tendons
D. Cartilage and bone

Answer: A. Actin and myosin filaments
During contraction, actin filaments slide over myosin filaments, shortening the sarcomere.

In the sliding filament theory, the length of which structure remains constant during contraction?

A. A band ✓
B. I band
C. H zone
D. Sarcomere

Answer: A. A band
The A band remains constant because the thick myosin filaments do not change in length during contraction.

Which one of the following is the most appropriate explanation for osteoporosis?

A. Excess accumulation of calcium in bones leading to stiffness
B. Loss of bone mass and increased fragility of bones ✓
C. Inflammation of skeletal muscles causing cramps
D. Fusion of joints leading to immobility

Answer: B. Loss of bone mass and increased fragility of bones
Osteoporosis is characterized by reduced bone density and increased risk of fractures due to weakened bones.

← Previous Chapter

Unit 2B: Excretory Products and Their Elimination

Next Chapter →

Unit 3B: Neural Control and Coordination