Every Book Back multiple-choice question from Origin and Evolution of Life (10th Standard Science, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
D. There is no relationship between phylogeny and ontogeny
Explanation. The biogenetic law holds that the development of an individual repeats the evolutionary history of its race. Ontogeny is individual development and phylogeny is racial history, so ontogeny recapitulates phylogeny.
Q2
The 'use and disuse theory' was proposed by ______________ .
A. Charles Darwin
B. Ernst Haeckel
C. Jean Baptiste LamarckCorrect
D. Gregor Mendel
Explanation. Use and disuse of organs, along with internal vital force, environment, new needs and the inheritance of acquired characters, are the main principles of Lamarckism.
Q3
Paleontologists deal with
A. Embryological evidences
B. Fossil evidencesCorrect
C. Vestigial organ evidences
D. All the above
Explanation. Palaeontology is the study of fossils, which are the remains of ancient life forms or habitats preserved by natural processes. Embryological and vestigial evidences belong to other branches.
Q4
The best way of direct dating fossils of recent origin is by
A. Radio-carbon methodCorrect
B. Uranium lead method
C. Potassium-argon method
D. Both (a) and (c)
Explanation. Radiocarbon dating suits fossils of recent origin because carbon has a short half life. Uranium lead and potassium argon methods are used for far older material.
Q5
The term Ethnobotany was coined by
A. Khorana
B. J.W. HarsbbergerCorrect
C. Ronald Ross
D. Hugo de Vries
Explanation. J.W. Harshberger coined the term ethnobotany, the study of how particular groups of people traditionally use plants. The other three are known for unrelated work.
About these Origin and Evolution of Life questions
These are the Book Back multiple-choice questions for Origin and Evolution of Life from the Tamil Nadu State Board (Samacheer Kalvi) 10th Standard Science syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Origin and Evolution of Life?
This chapter has 5 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 10th Standard Science MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Origin and Evolution of Life book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
