Write note on Java man and Peking man.

Answer: Java Man & Peking Man. Java man: a. Homo erectus fossils of Java were called Java man. b. Its fossils were first obtained by Dubois (1891) and these were named Pithecanthropus erectus. c. The cranial capacity was about 940cc. […]

Explain embryological evidences of evolution.

Answer: Embryological Evidences of Evolution. All living organisms in their early developmental stages show presence of the following distinct features: i. Development in sexually reproducing organisms begins from a single diploid cell stage, i.e. a fertilized egg or zygote. ii. Zygote […]

Describe any two biological evidences of evolution.

Answer: Biological Evidences of Evolution. i. Palaeontological evidence of evolution. a. Fossils are defined as the dead remains of plants and animals that lived in the past in various geological layers. b. Unlike the evidences from other branches of biology, evidence […]

Write a note on “Genetic drift”.

Answer: Genetic Drift. i. Any alteration in allele frequency in the natural population by pure chance is called genetic drift. ii. For example, elimination of a particular allele from a population due to events like accidental death prior to mating of […]

Define Gene pool. Explain the terms: Gene pool and Gene frequency.

Answer: Gene Pool & Gene Frequency. Gene Pool: The sum total of genes of all individuals of interbreeding population is called gene pool. i. It refers to the sum total of genes of all individuals of interbreeding population. ii. Changes […]

What is dichroism?

i. The property by which some doubly refracting crystals absorb the ordinary rays (O-rays) completely and extraordinary rays whose direction is parallel to the optic axis passing through the crystal, is called dichroism. ii. The crystal possessing dichroism property is […]

Explain the applications of Doppler effect of light in astronomical physics.

i. Doppler effect of light is used to determine the radial velocities of distant galaxies. ii. It is used to measure the speed of rotation of the sun. a. The east and west edges of the sun are photographed. Each […]