In Australia, marsupials and placental mammals have evolved to share many similar characteristics. This type of evolution may be referred to as :
1. Adaptive Radiation
2. Divergent Evolution
3. Cyclical Evolution
4. Convergent Evolution
A population of a species invades a new area. Which of the following condition will lead to Adaptive Radiation?
1. | Area with a large number of habitats having very low food supply |
2. | Area with a single type of vacant habitat |
3. | Area with many types of vacant habitats |
4. | Area with many habitats occupied by a large number of species |
Which of the following statements is correct about the origin and evolution of men?
1. | Agriculture came around 50,000 years back. |
2. | The Dryopithecus and Ramapithecus primates existing 15 million years ago, walked like men. |
3. | Homo habilis probably ate meat. |
4. | Neanderthal men lived in Asia between 100000 and 40000 years back. |
Match the hominids with their correct brain size:
Column I | Column II | ||
(a) | Homo habilis | (i) | 900 cc |
(b) | Homo neanderthalensis | (ii) | 1350 cc |
(c) | Homo erectus | (iii) | 650-800 cc |
(d) | Homo sapiens | (iv) | 1400 cc |
Select the correct option.
Options: | (a) | (b) | (c) | (d) |
1. | (iv) | (iii) | (i) | (ii) |
2. | (iv) | (i) | (iv) | (ii) |
3. | (iii) | (ii) | (i) | (iv) |
4. | (iii) | (iv) | (i) | (ii) |
In a species, the weight of a newborn ranges from 2 to 5 kg. 97% of the newborns with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 kg to 5 kg die. Which type of selection process is taking place?
1. | Cyclical selection | 2. | Directional selection |
3. | Stabilizing selection | 4. | Disruptive selection |
A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?
1. | 0.16 (AA); 0.36 (Aa); 0.48 (aa) |
2. | 0.36 (AA); 0.48 (Aa); 0.16 (aa) |
3. | 0.16 (AA); 0.24 (Aa); 0.36 (aa) |
4. | 0.16 (AA); 0.48 (Aa); 0.36 (aa) |
Variations caused by mutation, as proposed by Hugo de Vries, are:
1. | small and directionless | 2. | random and directional |
3. | random and directionless | 4. | small and directional |
Which of the following refers to correct example(s) of organisms that have evolved due to changes in environment brought about by anthropogenic action?
(a) | Darwin's Finches of Galapagos islands |
(b) | Herbicide-resistant weeds |
(c) | Drug-resistant eukaryotes |
(d) | Man-created breeds of domesticated animals like dogs |
1. (a) and (c)
2. (b), (c) and (d)
3. only (d)
4. only (a)
From his experiments, S.L. Miller produced amino acids by mixing which of the following in a closed flask:
1.
2.
3.
4.
Flippers of Penguins and Dolphins are examples of:
1. | Convergent evolution | 2. | Industrial melanism |
3. | Natural selection | 4. | Adaptive radiation |