Biology Test 8

Bolting is the premature opening of flowers and production of seed, sometimes brought on by stress due to heat or drought. It is an event that does not occur under the influence of Auxins.

The diffusion layer in the alveoli and blood vessels are formed of all the 3 layers mentioned in the option. Each layer plays their essential role in the diffusion of gases.

The partial pressure of O₂ is primarily controlling the association of O₂ with hemoglobin. More the pO₂ more is the binding, until a particular point after which it achieves saturation. The other factors also control the binding too, but not to that extent as the partial pressure of O₂ does.

Blocking of arteries due to deposition of fat and calcium is called Atherosclerosis. Emphysema is a chronic obstructive lung disease.

Haemodialyser is also known as blood dialyser or artificial kidney and is used in the condition of renal failure. It consists of cellophane tubes.

In human body, the last two (eleventh and twelfth ribs) are termed floating ribs (costae fluctuantes) or vertebral ribs.

The middle layer, choroid contains many blood vessels looks bluish in color . The choroid layer is thin over the posterior two- thirds of the eye ball but becomes thick in the anterior part to form the cilliary body .

When a neuron is not conducting any impulse i.e. Resting the axonal membrane is comparatively more permeable to potassium ions and nearly impermeable to sodium ions .