All Free Biology MCQs with Answers

• A. Ovary
• B. Uterus
• C. Oviduct
• D. Cervix

Explanation: After fertilization, the fertilized ovum, also known as the zygote, undergoes further development and implantation in the uterus.

• A. 5 ml
• B. 50 ml
• C. 500 ml
• D. 5000 ml

Explanation: The total lung capacity is approximately 5 L. Of this, 1.5 L, the residual volume, remains at the end of forced expiration.

• A. Bicarbonate
• B. COz
• C. Carboxyhemoglobin
• D. Blood plasma protein

Explanation: Explanation:The majority of carbon dioxide molecules are carried as part of the bicarbonate buffer system.This option is not correct.

• A. Carbon dioxide
• B. Temperature
• C. pH
• D. Light

Explanation: Option [A] the greater the carbon dioxide the lesser the capacity to carry oxygen, as Co2 increases more H+ ions are produced in…

• A. Contraction of lungs
• B. Contraction of intercostal membrane
• C. Relaxation of intercostal and diaphragm muscles
• D. Contraction of diaphragm muscles

Explanation: Option [a] Lungs do not contractOption[b] Internal intercostal muscles contractOption [c] During expiration External intercostal muscles…

• A. 6.7 litres
• B. 2.5 litres
• C. 7 litres
• D. 5-6 litres

Explanation: In an adult human being when the lungs are fully inflated the total inside capacity of lungs is about 5-6 litres.

• A. Amino group of haemoglobin
• B. Iron is part of haemoglobin
• C. heme portion of haemoglobin
• D. Plasma proteins

Explanation: Carbaminohemoglobin is a stable complex of carbon dioxide and hemoglobin that forms in red blood cells upon contact with carbon dioxide.

• A. 1.2 cm
• B. 1 cm
• C. 1 mm
• D. 1.2 mm

Explanation: When the smaller bronchi attain a diameter of one mm or less, then they are called bronchioles.

• A. Respiratory distress syndrome
• B. Emphysema
• C. Bronchitis
• D. Asthma

Explanation: The key feature of respiratory distress syndrome (RDS) is the insufficient production of surfactant in the lungs.Emphysema is a lung…

• A. Inspiration is an active process
• B. Expiration is a passive process
• C. Inspiration is a passive process
• D. Both expiration and inspiration are passive processes

Explanation: Inspiration is an active process because it involves the contraction of the diaphragm and intercostal muscles, which results in the…

• A. Trachea
• B. Bronchi
• C. Bronchioles
• D. Alveoli

Explanation: Bronchi are larger airway passages in the respiratory system, and they are primarily lined with cartilage for structural support.

• A. 5-6 liter.
• B. 8-9 liter
• C. 10-11 liter
• D. 12-13 liter

Explanation: The normal lung capacity of an average adult human is about 5 to 6 liters.

• A. Endoskeleton.
• B. Hydrostatic skeleton.
• C. Exoskeleton.
• D. Both A and B.

Explanation: Endoskeleton is an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.

• A. Calcium phosphate
• B. Calcium carbonate
• C. Calcium oxalate
• D. Calcium bicarbonate

Explanation: Explanation:The collagen fibers of bone are hardened by the deposition of calcium phosphate, which forms the mineral component of bone…

• A. Lymph nodes
• B. Red bone marrow
• C. Tonsils
• D. Spleen

Explanation: Option[a] Lymph nodes don't have a role in the production of WBC, they filter substances that travel through the lymphatic fluid.Option…

• A. Chrondrocytes
• B. Osteoblasts
• C. Ostecytes
• D. Osteoclasts

Explanation: Option [A] Chondrocytes are the cell responsible for cartilage formation cell,they are the only cells found in healthy cartilageOption[b]…

• A. Appendicular skeleton
• B. Exoskeleton
• C. Endoskeleton
• D. Hydrostatic skeleton

Explanation: The human skeleton consists of the axial skeleton, which comprises the cranium, backbone, and ribs, and the appendicular skeleton, which…

• A. Sacrum
• B. Cervical vertebrae
• C. Pubis
• D. Coccyx

Explanation: The last 4 vertebrae in humans are fused into a triangular structure known as the coccyx.

• A. 3 bones
• B. 4 bones
• C. 2 bones
• D. 1 bone

Explanation: Each half of the pelvic girdle comprises 3 bones: the ilium, the pubis, and the ischium.

• A. Ulna
• B. Fibula
• C. Tibia
• D. Femur

Explanation: The femur is the strongest and largest bone in the human body, whereas the humerus is the second-largest bone.