A thorn of Bougainvillea and a tendril of Cucurbita are an example of :

1.	analogous organs	2.	vestigial organs
3.	homologous organs	4.	defense organs

In sympatric speciation, reproductive isolation:
1. develops without a geographic barrier
2. develops due to a geographic barrier
3. is due to a change in chromosome number
4. does not lead to development of a barrier to mating

Aquatic mammals do not contain gill slits because:
1. they are fish and not mammals
2. they only float on the water
3. their adaptation to aquatic life is secondary
4. they respire through their moist skins and lungs

The change in allele frequencies that occurs over time within a population is called as:
1. microevolution, or adaptive evolution
2. macroevolution, or speciation
3. coevolution
4. phylogenetic evolution

The term “Homologous “ to mean the organs of different species that are related to each other through common descent, although now functionally different, was coined by :
1. Richard Owen
2. Erasmus Darwin
3. Ernst Haeckel
4. John Ray

Lamarck has been criticized mainly on his tenet of:
1. inheritance of acquired characters
2. use and disuse of organs
3. key role played by environment in evolution
4. vital force in the body

What causes the ‘struggle for existence?

U²³⁸, the radioactive isotope of uranium, is very useful in absolute dating of rocks. It’s half life is about:
1. 4500 years
2. 4.5 million years
3. 45 million years
4. 4.6 billion years

Both Charles Darwin and A.R.Wallace were influenced by the:
1. writings of J.B.S.Haldane on the origin of life
2. findings of Urey and Miller experiments
3. findings on the Galapagos Islands
4. essay on human population by T.R.Malthus

The genetic drift is also called as :
1. Sewall-wright effect
2. Hardy-Weinberg equilibrium
3. Balanced polymorphism
4. Gene flow