Download App

BIOLOGY 1 Marks Question

Evolution · Bihar Board (BSEB) STD 12 Science (BSEB - English Medium). 138 questions.

Questions · Page 1 of 3

1 Marks Question

🎯

Test yourself on this topic

50 questions · timed · auto-graded

Question 11 Mark
Describe one example of adaptive radiation.
Answer
Darwin's finches of the Galapagos islands had common ancestors but now have different types of modified beaks according to their food habits.
View full question & answer→
Question 21 Mark
Attempt giving a clear definition of the term species.
Answer
Species can be defined as a group of organisms that can interbreed under natural conditions and produce fertile off springs.
View full question & answer→
Question 31 Mark
Why are analogous structures a result of convergent evolution?
Answer
Analogous structures are not anatomically similar/do not have common ancestors and evolving for similar function in the same habitat.
View full question & answer→
Question 41 Mark
State two postulates of Oparin and Haldane with reference to origin of life.
Answer
  1. First form of life could have come from pre-existing non-living organic molecules/RNA & Protein.
  2. Formation of life was preceded by chemical evolution/formation of diverse organic molecules from inorganic constituents.
View full question & answer→
Question 51 Mark
Write the probable differences in eating habits of Homo habilis and Homo erectus.
Answer
Homo habilis did not eat meat/vegetarian.
Homo erectus ate meat (meat eater).
View full question & answer→
Question 61 Mark
How many chromosomes do drones of honeybee possess? Name the type of cell division involved in the production of sperms by them.
Answer
16, Mitosis.
View full question & answer→
Question 71 Mark
State Gause's Competitive Exclusion Principle.
Answer
Two closely related species competing for same resources, cannot coexist indefinitely (the inferior will be eliminated).
View full question & answer→
Question 81 Mark
Comment on the similarity between the wing of a cockroach and the wing of a bird. What do you infer from the above, with reference to evolution?
Answer
Similar in function/analogous organs, convergent evolution.
View full question & answer→
Question 101 Mark
According to Hardy – Weinberg’s principle the allele frequency of a population remains constant. How do you interpret the change of frequency of alleles in a population?
Answer
It indicates gene migration/gene flow/genetic drift/mutation/genetic recombination/natural selection leading to evolution.
View full question & answer→
Question 111 Mark
Name any two vertebrate body parts that are homologous to human forelimbs.
Answer
Forelimbs of horse/cow/dpg/cat.

Wings of bird/bat.

Flippers of dolphins/whale/seal.

View full question & answer→
Question 121 Mark
What is "fitness of an individual" according to Darwin?
Answer
Individual with reproductive fitness passes on the useful gene to the next generation.
View full question & answer→
Question 131 Mark
What role does an individual organism play as per Darwin’s theory of natural selection?
Answer
Individual with reproductive fitness passes on the useful gene to the next generation.
View full question & answer→
Question 151 Mark
State a reason for the increased population of dark coloured moths coinciding with the loss of lichens (on tree barks) during industrialisation period in England.
Answer
Natural selection/survival of fittest/escaped predators due to camouflage.
View full question & answer→
Question 161 Mark
Write the similarity between the wing of a butterfly and the wing of a bat. What do you infer from the above with reference to evolution?
Answer
Similar infunction(fly)/different in structure and origin/analogous organs, convergent evolution.
View full question & answer→
Question 191 Mark
Mention the type of evolution that has brought the similarity as seen in potato tuber and sweet potato.
Answer
Convergent evolution.
View full question & answer→
Question 201 Mark
What causes speciation according to Hugo de Vries?
Answer
Mutation (s)/large (heritable) differences arising suddenly in a population/Saltation (single step large mutation).
View full question & answer→
Question 211 Mark
Write the names of the following:
  1. A 15 mya primate that was ape-like.
  2. A 2 mya primate that lived in East African grasslands.
Answer
  1. About 15 million, primates called Dryopithecus was more ape-like.
  2. About 2 million, Australopithecines lived in East African grasslands.
View full question & answer→
Question 221 Mark
State the two principal outcomes of the experiments conducted by Louis Pasteur on origin of life.
Answer
Louis Pasteur by careful experimentation demonstrated that:
  1. Life comes only from pre-existing life.
  2. In pre-sterilized flasks, life did not come from killed yeast while in another flask open to the air, new organisms arose from killed yeast.
View full question & answer→
Question 241 Mark
Mark the odd one in give each of the following groups.
Carboniferous, Triassic, Devonian, Permian.
Answer
Triassic.
View full question & answer→
Question 251 Mark
What is gene migration?
Answer
When a section of population migrates, it results in addition of new genes or alleles to one population and their loss to another population. This is called gene migration.
View full question & answer→
Question 281 Mark
What is adaptive radiation?
Answer
Development of different functional structures from a common ancestral form is called adaptive radiation.
View full question & answer→
Question 311 Mark
Name any two vertebrate body parts that are homologous to human forelimbs.
Answer
Wings of birds, flippers of whales, forelimbs of dog cat, wings of bats.
View full question & answer→
Question 341 Mark
Among Ramapithecus, Australopithecines and Homo habilis - who probably did not eat meat?
Answer
Homo habilis.
View full question & answer→
Question 361 Mark
Pick out the ancestral line of Angiosperms from the list: Conifers, Seed ferns, Cycads, Ferns.
Answer
Seed ferns.
View full question & answer→
Question 371 Mark
Among the five factors that are known to affect Hardy-Weinberg equilibrium, three factors are gene flow, genetic drift and genetic recombination. What are the other two factors?
Answer
Mutation and Natural Selection are the other two factors.
View full question & answer→
Question 381 Mark
Mark the odd one in give each of the following groups.
Lamarckism, Darwinism, Branching descent, Natural selection.
Answer
Lamarckism.
View full question & answer→
Question 391 Mark
The theory of spontaneous generation was dismissed by whom and why?
Answer
Louis Pasteur rejected the theory of spontaneous generation and stated that life originates from pre-existing life.
View full question & answer→
Question 401 Mark
What is Hardy-Weinberg principle?
Answer
It is the principle which states that gene frequency in a population remains stable and constant from generation to generation.
View full question & answer→
Question 411 Mark
Name the placental mammals corresponding to the Australian 'spotted cuscus' and Tasmanian 'tiger cat', which have evolved as a result of convergent evolution.
Answer
Lemur and Bobcat.
View full question & answer→
Question 421 Mark
How does a population become 'founders' of a new species?
Answer
When the change in allele frequency is so different that the new sample of population becomes a different species, the original drifted population becomes founders to cause founder effect.
View full question & answer→
Question 431 Mark
According to Hardy-Weinberg principle, the allele frequency of a population remains constant. How do you interpret the change of frequency of alleles in a population?
Answer
The change in frequency of alleles indicates evolutionary change.
View full question & answer→
Question 441 Mark
What are the key concepts of Darwinian theory of evolution?
Answer
Two key concepts of Darwinism are:
  1. Branching descent.
  2. Natural selection.
View full question & answer→
Question 471 Mark
Mention the conditions on earth that favoured origin of life.
Answer
The conditions of primitive earth that favoured origin of life are:
  1. Reducing atmosphere.
  2. Very high temperature.
  3. Volcanic storms.
View full question & answer→
Question 481 Mark
What is divergent evolution?
Answer
It is the evolutionary process by which same structures developed differently due to different needs.
View full question & answer→
Question 491 Mark
Name the type of evolution that has resulted in the development of structures like wings of butterfly and bird. What are such structures called?
Answer
Convergent evolution. They are called analogous organs/ structures.
View full question & answer→
Question 501 Mark
Why are lichens regarded as pollution indicators?
Answer
Since, they do not grow in areas that are polluted, lichens are regarded as pollution indicators.
View full question & answer→
Generate Paper FreeAll Evolution topics
1 Marks Question - BIOLOGY STD 12 Science Questions - Vidyadip