Assertion  :      The development in cockroach is heterometabolous metamorphosis.

Reason     :      Young ones resemble the adults in all characters.

Assertion    :       Muscle fibres are said to be contractile in nature.

 Reason      :       Cells of muscle tissues can shorten forcefully and again return to the relaxed state.

Assertion   :       Blood can be coagulated by adding oxalate (Sodium or Potassium Oxalate) to it.

Reason      :       Oxalate depresses the action of anticoagulant present in the blood.

Assertion   :       Thigh muscles can get tired but not the muscles of ventricle of heart.

Reason      :       Muscles of thigh are voluntary whereas that of heart are involuntary muscles.

Assertion   :       Smooth muscle fibres do not appear to be striated.

Reason      :       This is due to regular alternate arrangement of thick and thin filaments is smooth muscle fibre.

Assertion   :       Intercalated discs are important regions of cardiac muscle cells.

Reason      :       Intercalated discs function as boosters for muscle contraction waves.

Assertion   :       Presence of connective tissue inside the brain is essential for conduction of nerve impulse.

Reason      :       Connective tissue hold together the nerve cells of brain.

Assertion   :       Neurons are said to possess the property of excitability.

Reason      :       Neurons can get excited by a given stimulus.

Assertion   :       Non-myelinated nerve fibres do not possess nodes of Ranvier.

Reason      :       This is due to the absence of nissl’s bodies in node of Ranvier.

Assertion   :       Extracellular materials help in separation of cells.

Reason      :       Cell junctions are formed by extra cellular materials.