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The main purpose of this channel is to: 1. Print various Maths questions. 2. Publishing various books. 3. Print various short notes. Share it with your friends! Hirriyyoota keessaniif share godha!
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A sample of gas at 15 °C and 1 atm has a volume of 2.58 L. What volume will this gas occupy at 38 °C and 1 atm?
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Which one of the following matter has definite shape and definite volume?
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The measured amount of product obtained in any chemical reaction is known as _____.
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Which one of the following is the longest period in the periodic table?
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When hydrogen and chlorine atoms are companied to form covalent bond, how many lone - pairs and bonding - pairs are there in HCl compound respectively?
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Which of the following element can not form ionic compound with oxygen?
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Which one of the following is not general properties of ionic compounds?
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Which of the following quantum number is known as orbital orientation quantum number?
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Dear our members, we have collected chemistry around 48 questions from all units, so practice it if you want. For grade 12 students!
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Repost from N/a
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Repost from Future Coders ET
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Questions: Biology
1.What is the primary mechanism driving evolution according to Charles Darwin?
a) Genetic drift
b) Natural selection
c) Gene flow
d) Mutation
2.Which of the following best defines evolution?
a) Change in an individual’s traits over its lifetime
b) Change in the genetic makeup of a population over generations
c) Random survival of organisms
d) A sudden increase in population size
3.What term describes the process where organisms better adapted to their environment tend to survive and reproduce?
a) Artificial selection
b) Survival of the fittest
c) Genetic equilibrium
d) Speciation
4.Which scientist co-proposed the theory of evolution by natural selection alongside Darwin?
a) Gregor Mendel
b) Alfred Russel Wallace
c) Thomas Huxley
d) Jean-Baptiste Lamarck
5.What is an example of a vestigial structure in humans?
a) Appendix
b) Lungs
c) Heart
d) Eyes
6.What type of evolution occurs when two species evolve in response to changes in each other?
a) Divergent evolution
b) Convergent evolution
c) Coevolution
d) Parallel evolution
7.Which of the following is NOT a source of genetic variation?
a) Mutation
b) Meiosis
c) Uniform weather conditions
d) Gene recombination
8.What is the term for the formation of a new species?
a) Adaptation
b) Speciation
c) Genetic drift
d) Hybridization
9.Which type of selection favors individuals at one extreme of a trait’s range?
a) Stabilizing selection
b) Directional selection
c) Disruptive selection
d) Random selection
10What is an example of convergent evolution?
a) Wings of birds and bats
b) Beaks of Darwin’s finches
c) Human and chimpanzee hands
d) Legs of horses and zebras
Answers:
1.b
2.b
3.b
4.b
5.a
6.c
7.c
8.b
9.b
10.a
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Which one of the following statements correctly describes bacteria? They are
A. single celled prokaryotic organisms.
B. multicellular eukaryotic organisms.
C. single celled eukaryotic organisms.
D. multicellular prokaryotic organisms.
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Which of the following best describes a key difference between Darwin's and Lamarck's theories of evolution?
A) Darwin believed traits were inherited through genes, while Lamarck believed traits were not inherited.
B) Lamarck believed species never change, while Darwin believed they do.
C) Darwin believed evolution happens through natural selection, while Lamarck believed it happens through use and disuse of traits.
D) Both Darwin and Lamarck believed that evolution is a sudden and random process.
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