Questions & explanations
1. Human evolution is considered a part of which type of evolution?
- Chemical evolution
- Biological or organic evolution
- Cosmic evolution
- Cultural evolution
Answer: Biological or organic evolution
Human evolution is a subset of biological evolution, which deals with changes in the genetic makeup of populations over time. Chemical evolution refers to the origin of life from non-living matter, cosmic evolution deals with the universe, and cultural evolution involves changes in human societies and technology.
2. The placental wolf and the Tasmanian wolf (marsupial) resemble each other closely. This is an example of:
- A. Convergent evolution
- B. Adaptive radiation
- C. Divergent evolution
- D. Coevolution
Answer: A. Convergent evolution
The placental wolf and the Tasmanian wolf evolved similar body forms and ecological roles (carnivorous predators) independently, despite belonging to different mammalian lineages (placental vs. marsupial). This similarity arises from adapting to similar habitats, illustrating convergent evolution.
3. Darwin's finches on the Galapagos Islands are a classic example of adaptive radiation. Which of the following best describes the key feature of this process?
- A. A single species evolves into multiple species with different ecological niches
- B. Multiple unrelated species evolve similar traits due to similar environments
- C. A species remains unchanged over long periods of time
- D. Species evolve only through genetic drift
Answer: A. A single species evolves into multiple species with different ecological niches
Adaptive radiation involves a single ancestral species diversifying into multiple species, each adapted to different ecological niches. Darwin's finches evolved from a common seed-eating ancestor into species with varied beak shapes for different food sources, such as insects or seeds.
4. Which of the following primate-like mammals existed about 15 million years ago and were hairy, walking like gorillas and chimpanzees?
- Australopithecus and Homo habilis
- Dryopithecus and Ramapithecus
- Homo erectus and Homo sapiens
- Neanderthals and Cro-Magnons
Answer: Dryopithecus and Ramapithecus
Dryopithecus and Ramapithecus lived around 15 million years ago and were hairy, walking like gorillas and chimpanzees. Australopithecus appeared later, around 2 million years ago. Homo erectus and Homo sapiens are even more recent. Neanderthals and Cro-Magnons are much later hominids.
5. Fossils with hominid features discovered in Ethiopia and Tanzania suggest that man-like primates walked in eastern Africa around:
- 15 million years ago
- 10 million years ago
- 3 to 4 million years ago
- 1.5 million years ago
Answer: 3 to 4 million years ago
Fossil discoveries in Ethiopia and Tanzania indicate that hominid-like primates existed about 3 to 4 million years ago. The other time frames correspond to different stages: 15 million years ago for Dryopithecus/Ramapithecus, and 1.5 million years ago for Homo erectus.
6. Which of the following statements about Neanderthal man is correct?
- Brain size of about 1400 cc, lived in near East and central Asia between 1,00,000 and 40,000 years ago, used hides for protection, and buried their dead.
- Brain size of about 900 cc, lived in Africa, and used fire extensively.
- Brain size of about 1200 cc, lived in Europe, and were the first to use tools.
- Brain size of about 1600 cc, lived in Asia, and developed agriculture.
Answer: Brain size of about 1400 cc, lived in near East and central Asia between 1,00,000 and 40,000 years ago, used hides for protection, and buried their dead.
Neanderthal man had a brain size of about 1400 cc, lived in the near East and central Asia between 1,00,000 and 40,000 years ago, used hides for protection, and buried their dead. The other options describe incorrect brain sizes, locations, or behaviors.
7. Which of the following statements about Australopithecines is correct?
- They lived about 15 million years ago in forests
- They were exclusively meat-eaters
- They lived about 2 million years ago in East African grasslands, hunted with stone weapons, and ate fruit
- They had a brain capacity of 900 cc
Answer: They lived about 2 million years ago in East African grasslands, hunted with stone weapons, and ate fruit
Australopithecines existed around 2 million years ago in East African grasslands. Evidence shows they used stone weapons for hunting but primarily ate fruit. They were not exclusively meat-eaters, and their brain capacity was smaller than 900 cc.
8. Australian marsupials are an example of adaptive radiation. Which statement correctly describes this phenomenon?
- A. They evolved from a common ancestral stock within Australia
- B. They evolved from placental mammals that migrated to Australia
- C. They are all identical in form and function
- D. They evolved independently without any common ancestor
Answer: A. They evolved from a common ancestral stock within Australia
Adaptive radiation of Australian marsupials occurred from a single ancestral stock that diversified into many species, each adapted to different habitats and lifestyles, such as kangaroos, koalas, and wombats.
9. Homo erectus, discovered in Java in 1891, lived about 1.5 million years ago. Which of the following is true about Homo erectus?
- They had a brain capacity of about 650 cc
- They were primarily fruit-eaters
- They had a large brain capacity of around 900 cc and probably ate meat
- They were the first to walk upright
Answer: They had a large brain capacity of around 900 cc and probably ate meat
Homo erectus had a brain capacity of about 900 cc, larger than earlier hominids, and evidence suggests they consumed meat. Australopithecines had smaller brains and ate fruit. Walking upright evolved earlier.
10. What is adaptive radiation?
- The process of evolution of different species in a given geographical area starting from a point and radiating to other areas.
- The process of evolution of a single species in a small area.
- The process of extinction of species in a geographical area.
- The process of migration of species from one area to another.
Answer: The process of evolution of different species in a given geographical area starting from a point and radiating to other areas.
Adaptive radiation is the evolution of different species in a given geographical area starting from a point and radiating to other habitats. The other options do not describe adaptive radiation.
11. When two or more adaptive radiations occur in different isolated geographical areas but result in similar adaptations, this phenomenon is called:
- A. Convergent evolution
- B. Divergent evolution
- C. Coevolution
- D. Parallel evolution
Answer: A. Convergent evolution
Convergent evolution occurs when different lineages independently evolve similar traits in response to similar environmental pressures, even though they are in different geographical areas.
12. Homo habilis, discovered in East Africa, had a brain capacity of:
- Around 900 cubic centimetres
- Between 650 and 800 cubic centimetres
- Less than 500 cubic centimetres
- Over 1000 cubic centimetres
Answer: Between 650 and 800 cubic centimetres
Homo habilis fossils show a brain capacity ranging from 650 to 800 cc. Homo erectus had around 900 cc, while earlier hominids had smaller brains. Modern humans have over 1000 cc.