All Free Biology MCQs with Answers

2051. Which one of the following is avascular structure?

• A. A compact bone.
• B. A spongy bone.
• C. Cartilage
• D. All of these

Explanation: Cartilage is avascular, meaning it has no direct blood vessels and receives nutrients by diffusion. The likely distractor is bone, but both compact and spongy bone contain blood vessels within their living tissue.

2052. Which one of the following is an example of a non-elastic connective tissue?

• A. Ligaments.
• B. Tendon
• C. Muscles.
• D. None of these

Explanation: Tendons are dense connective tissues with tightly packed collagen fibres and very little elasticity, allowing them to transmit muscle force to bone. The likely distractor is ligaments, which are also connective tissues but normally contain more elastic fibres and permit limited flexibility.

2053. In which of the following joint muscles are arranged in the same plane as that of joint?

• A. Between radius and ulna.
• B. Between ulna and scapula
• C. Between humerus and scapula
• D. Between femur and tibia.

Explanation: The femur-tibia joint is the knee joint, a synovial hinge-type joint whose principal movements occur mainly in one plane. The radius-ulna and other listed upper-limb articulations have different movement arrangements, so option a may be chosen by confusing forearm rotation with hinge movement.

2054. Fibrous capsule surrounding synovial joints may be thickened at some places to form:

• A. Synovial membrane.
• B. Ligaments.
• C. Muscles.
• D. Tendon

Explanation: The fibrous capsule of a synovial joint may become thickened into strong bands called ligaments, which reinforce and stabilise the joint. A tendon attaches muscle to bone, so option d is the likely mistake caused by confusing joint stabilisers with muscle attachments.

2055. Joint between two parietal bones, which is infact immovable one is an example of_________?

• A. Fibrous joints.
• B. Cartilaginous joints.
• C. Synovial joints.
• D. None of these

Explanation: The suture between the two parietal bones is an immovable fibrous joint in which bones are connected by dense connective tissue. Students may select option c because synovial joints are common in the limbs, but synovial joints are freely movable and have a joint cavity.

2056. A joint formed between humerus, radius and ulna is an example of__________?

• A. Immovable joint.
• B. Slightly movable joint.
• C. Freely movable joint.
• D. Fibrous joint

Explanation: The humerus, radius and ulna form the elbow, a synovial hinge joint that permits substantial movement, especially flexion and extension. It is therefore freely movable, whereas options a and b describe movement categories that do not fit a normal elbow joint.

2057. Joints present in skull are example of_______________?

• A. Fibrous joints
• B. Cartilaginous joints
• C. Synovial Joints
• D. Slightly moveable joints

Explanation: The joints between the bones of the skull are sutures, in which the bones are joined by dense fibrous connective tissue, so they are fibrous joints. Slightly movable joints are a functional category and do not specifically identify the fibrous structure of skull sutures; students may choose d because they confuse joint classification systems.

2058. Haemodialysis means cleaning of____________?

• A. Urine
• B. Blood
• C. Glomerular filterate
• D. Coelomic fluid

Explanation: Haemodialysis passes a patient's blood through a dialysis machine, where wastes and excess salts diffuse across a partially permeable membrane into dialysis fluid. It does not clean urine or glomerular filtrate, so option c is the likely confusion with normal kidney filtration.

2059. All Of the follwing Can Treat kidney Stone Except?

• A. Medicine
• B. Surgery
• C. Lithotripsy
• D. Dialysis

Explanation: Small kidney stones may pass with medicines and larger or persistent stones may be removed surgically or broken by lithotripsy using shock waves. Dialysis removes wastes and excess fluid from blood when kidney function fails, but it does not remove a kidney stone. Students may choose medicine if they think every stone requires a procedure.

2060. Which tube joins kidneys and bladder?

• A. Urethra
• B. Uretar
• C. Inferno Verna Cava
• D. Suprapubic Tube

Explanation: The ureter is a muscular tube that carries urine from each kidney to the urinary bladder. The urethra carries urine from the bladder to the outside, so students may choose it after confusing the two similarly named tubes.