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Maharashtra SSC (Class 10) Heredity and Evolution — practice questions — page 2

Explore 42 free Heredity and Evolution questions in Maharashtra SSC (Class 10) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Heredity and Evolution questions and exercises with answers

Showing questions 31–42 of 42.

Whose mutational theory of 1901 explained the reasons behind sudden hereditary changes?Read the answer and worked solution →The trio of Avery, McCarty and McLeod proved in 1944 that the genetic material in all living organisms except viruses is which molecule?Read the answer and worked solution →During transcription, mRNA is synthesised using how many of the two strands of a DNA molecule?Read the answer and worked solution →In RNA, which nitrogen base takes the place of the thymine that is found in DNA?Read the answer and worked solution →How many nucleotides make up the triplet codon that codes for a single amino acid?Read the answer and worked solution →Which Indian-origin scientist received the 1968 Nobel Prize for his work on triplet codons for the 20 amino acids?Read the answer and worked solution →On a tRNA molecule, the sequence that is complementary to the codon on mRNA is called the:Read the answer and worked solution →The amino acids brought in by tRNA are joined together by peptide bonds with the help of which molecule?Read the answer and worked solution →The stepwise movement of the ribosome along mRNA by a distance of one triplet codon is termed:Read the answer and worked solution →A sudden change in a gene, such as a nucleotide shifting its position, is known as a:Read the answer and worked solution →Which genetic disorder is given as an example of a condition that can be caused by a mutation?Read the answer and worked solution →Evolution is best defined as the change occurring in living organisms that takes place:Read the answer and worked solution →

Worked practice questions

Whose mutational theory of 1901 explained the reasons behind sudden hereditary changes?

  1. Walter Sutton
  2. Gregor Mendel
  3. Hugo de Vries
  4. Colin McLeod
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Correct answer: C. Hugo de Vries

1. Sudden changes in characters needed an explanation after Mendel's work. 2. In 1901 Hugo de Vries proposed the mutational theory for these sudden changes. 3. So the credit goes to de Vries. 4. Sutton observed paired chromosomes in 1902, a different contribution, so he is ruled out. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 1 "Heredity and Evolution", p.10_

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The trio of Avery, McCarty and McLeod proved in 1944 that the genetic material in all living organisms except viruses is which molecule?

  1. RNA
  2. DNA
  3. ATP
  4. Protein
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Correct answer: B. DNA

1. The nature of the genetic material was being investigated after genes were linked to chromosomes. 2. In 1944 Avery, McCarty and McLeod showed the genetic material is DNA. 3. This held for all living organisms except viruses. 4. Therefore the answer is DNA. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 1 "Heredity and Evolution", p.10_

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During transcription, mRNA is synthesised using how many of the two strands of a DNA molecule?

  1. Both strands
  2. Only one strand
  3. Neither strand
  4. Half of each strand
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Correct answer: B. Only one strand

1. Transcription is the production of mRNA based on the nucleotide sequence of DNA. 2. Only one of the two DNA strands is used as the template. 3. The mRNA sequence formed is complementary to that single strand. 4. Hence only one strand is used. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 1 "Heredity and Evolution", p.10_

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