STD 12 - 4. principal of inheritance and variation — NEET STD 11 Science — Question

The secretion of aldosterone by adrenal cortex is directly controlled by

The junction between the axon of one neuron and the dendrite of the next is called

The most important example of point mutation is found in a disease called

When a neuron is stimulated to generate nerve impulse, the electrical potential on the inside of the nerve membrane changes

When an organ is transplanted and is rejected by the body, the lymphocytes are produced by

The main nitrogenous waste of Hydra is

Which of the following glands are present in the brain?

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 :-