All Free Biology MCQs with Answers

• A. Humerus
• B. Pubis
• C. Scapula
• D. Clavicle

Explanation: Small bones are solid. Long bones, such as the humerus and femur, have a cavity, the marrow cavity, at the centre.

• A. Spindle shaped, unbranched, nonstriated, uninucleate and involuntary
• B. Spindle shaped, unbranched, unstriped, multinucleate and involuntary
• C. Cylindrical, unbranched, unstriped, multinucleate and involuntary
• D. Cylindrical, unbranched, striated, multinucleated and voluntary

Explanation: The smooth muscle consists of long, narrow unbranched spindle-shaped fibres.

• A. Thick skin
• B. Dry skin
• C. Smooth skin
• D. Moist skin

Explanation: Mucus helps the frog in forming moist skin as skin is its respiratory organ.

• A. Deposition of bony matter by osteoblasts and resorption by chondroclasts
• B. Deposition of grey matter by osteoclasts
• C. Deposition of bony matter by osteoclasts only
• D. Deposition of bony matter by osteoblasts only

Explanation: The bone is an unusual tissue in that it is continually being reconstructed.

• A. Stratum compactum
• B. Stratum corneum
• C. Stratum malpighii/stratum germinativum
• D. Stratum lucidum

Explanation: Stratum malpighii/stratum germinativum is the innermost layer of the skin consisting of one-celled thick columnar epithelial cells.

• A. Epidermal in origin and made up of dead cells
• B. Epidermal in origin and made up of living cells
• C. Dermal in origin and made up of living cells
• D. Dermal in origin and made up of dead cells

Explanation: Each hair is present in a tubular pit called hair follicle which is made up by sinking of epidermis.

• A. Outer surface of ovary
• B. Inner lining of fallopian tube
• C. Inner lining of stomach
• D. Inner lining of cheeks

Explanation: An epithelial tissue which has thin flat cells, arranged edge to edge so as to appear like closely packed tiles is known as the…

• A. The communication between the pharynx and the tympanic cavity
• B. The external opening of the tympanic cavity which is covered by the tympanic membrane
• C. The air filled cavity of the middle ear
• D. The opening in the auditory capsule which separates the middle ear from the internal ear.

Explanation: The bony partition between the tympanic cavity (cavity of the middle ear) and the auditory capsule (internal ear) is perforated by a small…

• A. Pterygoid
• B. Hyoid apparatus
• C. Parasphenoid
• D. Palatine

Explanation: In an adult frog, gills disappear and their skeletal framework is also reduced to form hyoid apparatus.

• A. Frontoparietal
• B. Orbitosphenoid
• C. Parasphenoid
• D. Alisphenoid

Explanation: Frontoparietals are a pair of long, broad, flattened and membranous bones.

• A. Columnar
• B. Squamous
• C. Cuboidal
• D. Ciliated

Explanation: Stratum germinativum (also stratum basale or basal cell layer) is the layer of keratinocytes that lies at the base of the epidermis…

• A. No cell product of epithelial cell
• B. Epidermal cell only
• C. Endodermal cell
• D. Both (b) and (c)

Explanation: Basement membrane (basal lamina) is a thin sheet of fibrous proteins that underlies and supports the cells of an epithelium, separating…

• A. Cartilagin
• B. Ossein
• C. Chondrin
• D. None of these

Explanation: Chondrin is a protein present in the matrix of cartilage. It forms a constituent of a compound called chondrin sulphate.

• A. Yellow fibrous connective tissue
• B. Modified white fibrous tissue
• C. Areolar tissue
• D. Adipose tissue

Explanation: White fibrous tissue has two forms: cords and sheets. The white fibres run parallel to form cords, called tendons.

• A. Inelastic white fibrous tissue
• B. Modified white fibrous tissue
• C. Modified yellow elastic fibrous tissue
• D. None of the above

Explanation: Ligament occurs in the form of cords in a modified yellow elastic fibrous tissue and connects bone with a bone.

• A. Are arranged indiscriminately
• B. Make a definite layer
• C. Continue to divide and help in organ function
• D. None of the above

Explanation: The simple epithelium consists of a single layer of cells resting on a basement membrane. This makes it a definite layer.

• A. Epithelial cells
• B. Muscle cells
• C. Nerve cells
• D. Gland cells

Explanation: Nerve cells are highly excitable cells specialized for impulse conduction.

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

Explanation: Nasal septum consists of hyaline cartilage. It is bluishgreen and translucent in appearance.

• A. Striated muscle
• B. Areolar tissue
• C. Stratified epithelium
• D. Myelinated nerve fibres

Explanation: In areolar tissue, there is interercellular space, so the quantity of extracellular material is present in this tissue.

• A. Bones with bones
• B. Fat body with muscles
• C. Integument with muscles
• D. Bones with muscles.

Explanation: Areolar tissue is a loose connective tissue comprised of a semifluid ground substance containing several kinds of loosely arranged fibres.