Tamil Nadu Board 12th Standard Bio-Zoology - Chapter 6: Book Back Answers and Solutions
This post covers the book back answers and solutions for Chapter 6 – Bio-Zoology from the Tamil Nadu State Board 12th Standard Bio-Zoology textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Bio-Zoology Chapter 6 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 12 students! Prepare well and aim for top scores. Thank you!
Chapter 6: Evolution
I. Multiple Choice Questions
a) in air
b) on land
c) in water
d) on mountain
Answer Key:
c) in water
2) Who published the book “Origin of species by Natural Selection” in 1859?
a) Charles Darwin
b) Lamarck
c) Weismann
d) Hugo de Vries
Answer Key:
a) Charles Darwin
3) Which of the following was the contribution of Hugo de Vries?
a) Theory of mutation
b) Theory of natural Selection
c) Theory of inheritance of acquired characters
d) Germplasm theory
Answer Key:
a) Theory of mutation
4) The wings of birds and butterflies is an example of
a) Adaptive radiation
b) convergent evolution
c) divergent evolution
d) variation
Answer Key:
b) convergent evolution
5) The phenomenon of “ Industrial Melanism” demonstrates
a) Natural selection
b) induced mutation
c) reproductive isolation
d) geographical isolation
Answer Key:
a) Natural selection
6) Darwin’s finches are an excellent example of
a) connecting links
b) seasonal migration
c) adaptive radiation
d) parasitism
Answer Key:
c) adaptive radiation
7) Who proposed the Germplasm theory?
a) Darwin
b) August Weismann
c) Lamarck
d) Alfred Wallace
Answer Key:
b) August Weismann
8) The age of fossils can be determined by
a) electron microscope
b) weighing the fossils
c) carbon dating
d) analysis of bones
Answer Key:
c) carbon dating
9) Fossils are generally found in
a) igneous rocks
b) metamorphic rocks
c) volcanic rocks
d) sedimentary rocks
Answer Key:
d) sedimentary rocks
10) Evolutionary history of an organism is called
a) ancestry
b) ontogeny
c) phylogeny
d) paleontology
Answer Key:
c) phylogeny
11) The golden age of reptiles was
a) Mesozoic era
b) Cenozoic era
c) Paleozoic era
d) Proterozoic era
Answer Key:
a) Mesozoic era
12) Which period was called “Age of fishes”?
a) Permian
b) Triassic
c) Devonian
d) Ordovician
Answer Key:
c) Devonian
13) Modern man belongs to which period?
a) Quaternary
b) Cretaceous
c) Silurian
d) Cambrian
Answer Key:
a) Quaternary
14) The Neanderthal man had the brain capacity of
a ) 650 – 800cc
b) 1200cc
c) 900cc
d) 1400cc
Answer Key:
d) 1400cc
15) According to Darwin, the organic evolution is due to
a) Intraspecific competition
b) Interspecific competition
c) Competition within closely related species.
d) Reduced feeding efficiency in one species due to the presence of interfering species.
Answer Key:
b) Interspecific competition
16) A population will not exist in Hardy- Weinberg equilibrium if
a) Individuals mate selectively
b) There are no mutations
c) There is no migration
d) The population is large
Answer Key:
a) Individuals mate selectively
II. Short answer questions
12th bio zoolgy III. Long answer questions
12th bio zology
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