STD 12 - 7. human health and disease — NEET STD 11 Science — Question

The vertebratrial canal is present in the vertebrae that are

Big-Bang theory attempts to explain the origin of

Assertion : Cocaine has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy.

Reason : Injecting the microbes intentionally during immunisation or infectious organisms gaining access into body during natural infection induces active immunity.

Primary treatment is the

The cerebral cortex is referred to as the grey matter due to its greyish appearance. The ........... are concentrated here giving the colour.

Mark the given statements True (T) or False (F).
(i) The process of exchange of O₂ from the atmosphere with CO₂ produced by cells is called breathing.
(ii) Mechanisms of breathing vary among different groups of animals depending mainly on their habitat and level of organisation.
(iii) Earthworm use their moist skin for breathing.
(iv) The nasal chamber opens into the pharynx, a portion of which is common passage for food and air
(v) Larynx is a bony box which helps in sound production and hence called sound box.
(vi) During swallowing, glottis can be converted into a thick cartilaginous flap called epiglottis to prevent entry of food into larynx.
(vii) Trachea is a straight tube extending up to the mid-thoracic cavity, which divides at the level of 5-thoracic vertebra into right and left primary bronchi.
(viii) Humans have two lungs which are covered by a single layered pleura, with pleural fluid between them.
(ix) The part starting with external nostrils up to terminal bronchioles constitute conducting part whereas the alveoli and their ducts form respiratory or exchange part of respiratory system.
(x) The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs and on the lower side by dome-shaped diaphragm.
Choose the correct option given below :-

The major constituent of connective tissue is