All Free Biology MCQs with Answers

• A. 30-40
• B. 30-35
• C. 40-45
• D. 50-60

Explanation: Osteopenia is a clinical term used to describe a decrease in bone mineral density (BMD) below normal reference values.

• A. Chondrocytes
• B. Osteocytes
• C. Osteoblasts
• D. Osteoclasts

Explanation: Cartilage, a type of connective tissue, contains specialized cells known as chondrocytes.

• A. Maxilla
• B. Frontal bone
• C. Mandible
• D. Zygomatic

Explanation: The correct answer is the mandible. It is the only bone in the skull that moves, allowing for the opening and closing of the mouth, which…

• A. Cartilage
• B. Bone
• C. Muscles
• D. All of the above

Explanation: In animals, support is provided by a combination of cartilage, bones, and muscles.

• A. Osteoblasts
• B. Osteocytes
• C. Osteoclast
• D. Chondocytes

Explanation: In bones, there are different types of cells involved in bone formation and maintenance.

• A. No blood circulation
• B. mostly contain type li collagen
• C. They can be shaped
• D. No inorganic salts

Explanation: Cartilage does contain inorganic salts, particularly calcium salts, which contribute to its hardness and rigidity.

• A. Maxilla
• B. Lacrimal
• C. Mandible
• D. Palatine

Explanation: The mandible is the correct answer. It is the only unpaired facial bone and forms the lower jaw

• A. Calcium carbonate
• B. Calcium phosphate
• C. Potassium hydroxide
• D. Calcium chloride

Explanation: The major inorganic component of vertebrate bone is hydroxyapatite, which is a crystalline structure made primarily of calcium phosphate.

• A. Long bones
• B. Appendicular skeleton
• C. Trabeculae
• D. Axial Skeleton

Explanation: The bones in the long axis of the body, which include the skull, vertebral column, and ribcage, collectively make up the axial skeleton.

• A. Sternum
• B. Clavicle
• C. Pelvic bone
• D. Hyoid bone

Explanation: The pectoral girdle, also known as the shoulder girdle, is the set of bones that connect the upper limbs (arms) to the axial skeleton.

• A. Myocardium
• B. Cartilage
• C. Bone
• D. Periosteum

Explanation: Option B is correct. The connective tissue that consists of cells known as chondrocytes is cartilage.

• A. Calcified
• B. Elastic
• C. Fibrous
• D. Hyaline

Explanation: At the beginning of the menstrual phase, the levels of ovarian hormones, specifically estrogen and progesterone, are at their lowest.

• A. Tendons
• B. Smooth muscles
• C. Ligaments
• D. Nerves

Explanation: Bones are held together at joints by ligaments. Ligaments are fibrous connective tissues that connect bones to other bones, providing…

• A. Fibrous joint
• B. Cartilaginous joint /sliding joint
• C. Hinge joint
• D. Ball and socket joint

Explanation: Option B is correct. The joint between wrist bones is a cartilaginous joint.

• A. Cartilaginous joints
• B. Synovial joint
• C. Hinge joint
• D. Ball and socket joint

Explanation: Hip and shoulder joints are examples of ball and socket joints, while ball and socket joints and hinge joints are examples of synovial…

• A. Excess of water
• B. Deficiency of minerals.
• C. Deficiency of Minerals
• D. Dehydration

Explanation: Sometimes whole sentence is just for distracting the student, but you have to figure out which is important point.

• A. Proximal convoluted tubule cof Nephron
• B. Distal convoluted tubule of Nephron
• C. Glomerulus
• D. Bowman\s capsule

Explanation: Glucose is a polar molecule that dissolves in water and blood plasma. It easily passes through the glomerular basement membrane.

• A. Remove kidney stones without surgery
• B. Remove kidney stones with surgery
• C. Treat kidney with medicines
• D. Remove appendix

Explanation: Lithotripsy involves the treatment of stones in the kidneys or ureters by using high-energy shock waves, breaking the stones which can…

• A. Proximal convoluted tubule of nephron
• B. Distal convoluted tubule of nephron
• C. Glomerulus
• D. Bowman capsule

Explanation: The correct option is A. Glucose reabsorption primarily occurs in the proximal convoluted tubule (PCT) of the nephron in the kidney.

• A. Lithotipser
• B. Heamometer
• C. Dialyzer
• D. None of the above

Explanation: A dialyzer is a machine that functions similarly to a kidney in removing nitrogenous waste from the blood.