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Describe briefly four ways in which individual with a particular trait may increase in population. Foreign Answer: Four ways in which individual with a particular trait may increase in population are:. Question 4. Foreign Answer: Variation is the difference in the characters or traits among the individuals of a species.
Sexual reproduction of organisms produces variation. The variations produced in organisms during successive generations gets accumulated in the organism. The significance of variations shows up only if it continues to be inherited by the offspring for several generation. Question 5. What are fossils? What do they tell about the process of evolution? AI Answer: Fossils are preserved traces or remains of living organism of geological past. Fossils help to trace the racial history of organisms.
Fossils found closer to the surface are more recent than fossils found in the deepest layers. Question 6. What is meant by the term speciation? List four factors which could lead to speciation. CBSE Answer: Speciation is the evolution of reproductive isolation among once interbreeding population. Factors which can lead to speciation are:. Question 7. A blue colour flower plant denoted by BB is cross breed with that of white colour flower plant denoted by bb.
Question 8. Distinguish between homologous organs and analogous organs. In which category would you place wings of a bird and wings of a bat? Justify your answer giving a suitable reason. Wings of a bird and wings of a bat are analogous organs as they have different basic structural design but have similar appearance and perform similar functions.
Question 9. Justify this statement. CBSE Answer: Evolution is sequence of gradual changes which takes place in living organisms over millions of years to give rise to new species. Evolution does not mean progress in every case. This can be proved by example of bacteria. Bacteria are the simplest and one of the oldest organisms on the earth. Their simple body design does not make them weak. Bacteria are known to survive some of the harshest climates like volcanoes and sulfur springs.
Many animals have certain features which hamper even their routine activities. For example the branch-like horns of antelope are a handicap for them. When an antelope runs for its life there are times when its horns get entangled in branches or bushes. This results in the death of the antelope. Question If we cross pure-breed tall dominant pea plant with pure-breed dwarf recessive pea plant we will get pea plants of Fx generation.
If we self-cross the pea plant of F 2 generation, then we obtain pea plants of F 2 generation. How are fossils formed? Describe, in brief, two methods of determining the age of fossils.
However, sometime the body or at least some parts of the body may be in such an environment that does not let it decompose completely. All such preserved traces of living organisms are called fossils. State the meaning of inherited traits and acquired traits. Which of the two is not passed on to the next generation? Explain with the help an example.
CBSE Answer: Inherited traits are the characteristics transmitted from parents to their offspring. Acquired traits are characteristics which are developed during the lifetime of an individual.
Acquired traits are not passed on to the next generation. They should solve a number of questions that are important from the exam point of view.
They should learn the right technique to answer different types of questions to fetch them maximum marks. Therefore, students must solve the paper to give an edge to their board exam preparations. Also the word limit be adhered to as far as possible. However, an internal choice has been provided in Section B and Section C. Only one of the choices in such questions has to be attempted. Its popularity has survived thousands of years and has played an important role in many cultures.
It is enjoyed both hot and cold, as a refreshing drink, as part of a ceremony, or as a tonic for improving health.
It is rightly said that there will be no agreement on a perfect cup of tea.
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