Biology Test 287

Pigments are substances that have an ability to absorb light, at specific wavelengths. The chlorophyll a pigment to absorb lights of different wavelengths.

The light-dependent transfer of electrons by chloroplasts in photosynthesis that results in the cleavage of water molecules and liberation of oxygen is called the Hill reaction. Hill reaction required ferricyanide.

Hill Reaction:

Electrons become excited and jump into an orbit farther from the atomic nucleus. These electrons are picked up by an electron acceptor which passes them to an electrons transport of cytochrome.

In the leaves of C4 plants such as maize, sorghum we can observe the Kranz anatomy.

When several factors affect any [bio] chemical process, Blackman’s (1905) Law of Limiting Factors comes into effect.

According to this law, If a chemical process is affected by more than one factor, then its rate will be determined by the factor which is nearest to its minimal value: it is the factor that directly affects the process if its quantity is changed.

In Diuresis, the secretion of urine takes place in large quantities.

K⁺ and HCO₃^- ions are secreted by active transport into the filtrate in the distal convoluted tubule.

Loop of Henle is covered by a U-shaped staircase of network of blood capillaries arising from efferent glomerular arteriole.

This is the correct option. Renin changes plasma protein, called angiotensinogen to a peptide, called angiotensin II, which works as a hormone.

1-1.8 litres of urine is excreted by an adult in a day. About 2.5% of urea is present in the urine.