UP CPMT Zoology - 2000

Rh factor is an antigen that is found on the surface of red blood cells. Red blood cells with the antigen are said to be Rh positive (Rh+). This factor was first discovered in rhesus monkeys and hence, its name. Later on, Rh factor was also found in almost 85% of the human population.

SA node is the heart's natural pacemaker. In the upper part of the right atrium of the heart, there is a specialised bundle of neurons known as the sinoatrial node (SA node).

Planula is the flat, free-swimming ciliated larva of cnidarian or coelentrate.

Contractile vacuole is found at the trailing end of the body because its main function is to get rid of extra water. So, by collecting water inside the body, it expands and moves out from the trailing end of the body.

When sufficient oxygen is not present in the muscle cells for further oxidation of pyruvate and NADH produced in glycolysis, NAD+ is regenerated from NADH by the reduction of pyruvate to lactic acid.

Enterokinase is a proteolytic enzyme that is secreted by duodenal mucosa.

Liver is the largest organ/gland in the human body. During development, liver size increases with the increasing age.

It is the transmission of a gene from mother to son or father to daughter. Transmission in X-chromosome linkage is an example.

Depending on the species, ant colonies can consist of millions of ants. There are three kinds of ants in a colony: the queen, the female workers and the males.

Adrenaline is released in the body of a person who is feeling strong emotions (such as excitement, fear or anger) and it causes the heart to beat faster. It is also called the stress hormone. It is secreted from adrenal medulla.

Epididymis is divided into 3 parts - the caput (head), corpus (body) and cauda (tail). Thus, caput epididymis is present at the head of the testis.

The islets of Langerhans are found in pancreas that make the hormones insulin and glucagon. The alpha cells make glucagon and beta cells to produce insulin.

Fossils are the preserved remains or traces of animals, plants and other organisms from the remote past. They provide the most evident proof of evolution.

Alloxan is widely used to induce experimental diabetes in animals as it destroys beta cells of islets of Langerhans.

Archaeocytes are the totipotent cells which are capable of transforming into other type of cells.

7-Dehydrocholesterol is a type of cholesterol that functions in the serum as a cholesterol precursor and is converted to vitamin D₃ in the skin.

Hyaline means transparent. It is found on many joint surfaces.

The trigeminal nerve is the largest and most complex of the twelve cranial nerves. It is the motor nerve for the muscles of mastication. It is the fifth cranial nerve.

Correct Answer: different embryonic origin, but perform similar functions

The ectoplasm is called the plasma gel and the endoplasm is called the plasma sol. Sol-gel conversion is the contraction and relaxation event that is related to viscosity.