UP CPMT 2000 - Biology Part 2

The organisms that excrete nitrogenous wastes as uric acid in the form of pellet or paste with a minimum loss of water are called uricotelic animals, e.g. birds and most of the insects.

Purkinje fibres are the specialized cardiac muscle fibres which are a part of the impulse-conducting network of the heart that rapidly transmits impulses from the atrioventricular node to the ventricles.

The thymus is a specialized primary lymphoid organ of the immune system. In mammals, it is a bilobed organ in the region of the lower neck, above and in front of the heart.

Homeotherms maintain a relatively constant body temperature that is independent of the temperature of the surrounding environment.

Ligaments are the connective tissue which connect two bones to each other.

Juvenile hormone regulates metamorphosis in insects and its effects on the nervous system during the larval-pupal transition have been studied and confirmed.

Thigmotaxis is a touch or mechanical stimulus shown by amoeba.

As per the theory of abiogenesis, abiogenesis occurred 3.5 billion years ago. It is a scientific theory which states that life arose on Earth via spontaneous natural means due to conditions present at the time.

All species of schistosomes employ freshwater snails as intermediate hosts. Intermediate host is a host that harbors the parasite only for a short transition period, during which (usually) some developmental stage is completed.

On the mid-ventral line of the 14^th segment, a single female genital pore is present.

Oxygen dissociation curve is meant for the affinity of oxygen for haemoglobin. It relates oxygen saturation and partial pressure of oxygen in the blood (pO₂). It actually explains how readily haemoglobin acquires and releases oxygen molecules from its surrounding tissue. It is sigmoid in nature.

Correct Answer: Apiculture - Honey bee

It is the syndrome in males which results in two X chromosomes in males. Thus, there are 47 chromosomes in total.

The class Turbellaria is the most primitive group within the phylum Platyhelminthes, the flatworms.

Both Porifera and Annelida are phyla. The common examples of the genera in Porifera are Lycon, Sycon, etc. and an example of the phylum Annelida is earthworm.