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

Which is incorrect in Mendelian characters ?

Character                dominant                recessive

Select the correct arrangement of neural organization, according to the increasing degree of complexity.

Select the correct group/set of Australian Marsupials exhibiting adaptive radiation.

Which of the following statements are correct for regulation of cardiac activity ?
(i) A special neural centre in the medulla oblongata can moderate the cardiac function through autonomic nervous system.
(ii) Neural signals through the sympathetic nerves can increase the rate of heart beat, the strength of ventricular contraction and thereby the cardiac output.
(iii) Parasympathetic neural signals decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.
(iv) Adrenal medullary hormones can also increase the cardiac output.
(v) Adrenalin or epinephrine increase heart beat.
(vi) Acetylcholine decrease heart beat.

Reptilia are differ from Amphibians in this matter

Assertion : In the descending limb of loop of Henle, the urine is hypertonic, whereas in ascending limb of loop of Henle, the urine is hypotonic.
Reason : Descending limb is impermeable to sodium, while ascending limb is impermeable to water.

The dark bands in a myofibril are due to overlapping of

Assertion: Among vertebrates, fishes use gills whereas reptiles, birds and mammals respire through lungs.
Reason: Amphibians like frogs only respire through their moist skin.

What is the most important factor for the success of animal population