Biology Test 113

In which of the following stage of cardiac cycle semilunar valves remain closed ?

A minute vessel emerging from peritubular capillary network runs parallel to the Henle's loop forming a 'U'- shaped :-

Which of the following is not a part of filtration Membrane ?

Presence of Ketone bodies in urine are indicative of :-

Grasslands can support greater grazing rates by herbivores than forests because :-

Which of the following statements regarding the movement of energy and nutrients through ecosystems is true ?

(A) P-cycling depends only on biological processes

(B) In general, food chains are more stable than food webs

(C) The food chain that depends on decomposing plant or animal matter is the detritus food chain

(D) Humans can feed at several trophic levels and are classified as omnivores

Which of the following statements about food chains and energy flow through ecosystems is false ?

Selects the correct statement(s).

(A) The factors affecting decomposition are chemical nature of detritus and the climatic factors

(B) If detritus is rich in lignin, and chitin decomposition is very fast

(C) Decomposition is very slow, if the detritus is rich in nitrogen

(D) Detritus is the raw material for decomposition

(A) The amount of living matter (biomass) present at every trophical level is called standing crop

(B) Saprophytes are not given any place in ecological pyramids

(C) Ecological pyramid does not account for the same species belonging to two or more trophic levels