Speciation_Unsolved Paper
Chapter: Heredity and Evolution | Topic: Speciation
SPECIATION_UNSOLVED PAPER
Topic: Speciation
Q1.Speciation refers to:
- Growth of an individual organism
- Repair of damaged tissues
- Formation of new organs in an organism
- Formation of a new species from an existing population
Q2.Which of the following can contribute to speciation?
- Geographical isolation
- Complete absence of variation
- Identical environmental conditions everywhere
- Lack of reproduction
Q3. A population of organisms becomes separated by a large mountain range. Over many generations, the two groups develop significant differences.
This situation is an example of the possible role of:
- Geographical isolation
- Digestion
- Respiration
- Asexual growth
Q4.Which factor can prevent two separated populations from freely exchanging genes?
- Geographical isolation
- Increased rainfall alone
- Normal breathing
- Growth of body tissues
Q5. Which of the following is most important for populations to become genetically different over generations?
- Accumulation of variations
- Complete genetic similarity
- Absence of reproduction
- No environmental change
Q6.Which situation provides the strongest possibility for speciation?
- Two populations remain completely connected and freely interbreed
- Two populations become isolated and accumulate differences over many generations
- All individuals have exactly the same genetic characteristics
- A population stops reproducing permanently
Short questions
Q1. What is meant by speciation?
Q2. How can geographical isolation contribute to the formation of new species?
Q3. Why are variations important in the process of speciation?
Q4. What is meant by reproductive isolation? Why is it important for speciation?
Q5. Imagine that a school garden is divided into two sections by a permanent wall. Plants in the two sections experience slightly different conditions for many generations.
How could continued separation influence the differences between the two plant populations?
Q6. India has mountains, forests, deserts, islands, and other geographical features. How might such geographical differences contribute to the separation of populations of the same species?
Q1. Explain how geographical isolation, variation, and natural selection can work together in the process of speciation.
Q2.Describe a possible sequence of events through which a single population could gradually become two different species. Include the role of isolation and genetic changes in your answer.
Q3.Imagine that a population of animals becomes divided into two groups because a new physical barrier appears in their habitat. The two groups remain separated for many generations.
Explain how environmental differences, variations, and reproductive isolation could eventually contribute to speciation.
Q1. A population of 400 organisms becomes divided into two geographically isolated groups:
Group A: 240 organisms
Group B: 160 organisms
a) Calculate the percentage of the original population in each group.
b) Why could maintaining this separation over many generations be significant for speciation?
Q2.Two isolated populations are studied for a particular characteristic.
a) Calculate the percentage of individuals showing the variation in each population.
b) Which population shows the higher percentage for this variation?
Q3. A population of 600 organisms is separated into three geographically isolated groups of 200 organisms each. After several generations, the groups show different inherited characteristics.