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ICSE Class 9 Biology — practice by topic

Browse 86 questions across 6 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Tissues: Plant and Animal Tissues (30)Cell Structure (27)Cell: The Unit of Life (27)Respiration in Plants (27)Basic Biology — Cell (1)Flowering Plants (1)

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Cell theory in 1839 was first proposed byRead the answer and worked solution →Mitochondria are commonly called theRead the answer and worked solution →Which structure is present in plant cells but absent in animal cells?Read the answer and worked solution →The hereditary material in the nucleus is organised inRead the answer and worked solution →

Worked practice questions

Cell theory in 1839 was first proposed by

  1. Schleiden and Schwann
  2. Watson and Crick of DNA fame
  3. Mendel and Morgan of genetics fame
  4. Darwin and Wallace of evolution fame
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Correct answer: A. Schleiden and Schwann

1. The chapter section 2.3 names Matthias Schleiden and Theodor Schwann. 2. They proposed cell theory in 1839. 3. Virchow's 1858 addition was that all cells arise from pre-existing cells. 4. So option A names the right pair. _Source: Selina Concise Biology Class 9, Ch 2 Cell, the Unit of Life (Mistral OCR'd PDF), section 2.3_

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Mitochondria are commonly called the

  1. Brain of the cell that stores genes
  2. Power houses of the cell
  3. Suicide bags carrying digestive enzymes
  4. Kitchen of the plant cell with chloroplasts
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Correct answer: B. Power houses of the cell

1. Mitochondria release energy from glucose as ATP. 2. ATP is the immediate energy currency of the cell. 3. Because they power cellular processes, they are called power houses. 4. So option A is correct. _Source: Selina Concise Biology Class 9, Ch 2 Cell, the Unit of Life (Mistral OCR'd PDF), section 2.7 Mitochondria_

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Which structure is present in plant cells but absent in animal cells?

  1. Cytoplasm filled with organelles
  2. Cell membrane made of lipoprotein
  3. Cell wall made of cellulose
  4. Nucleus carrying genetic material
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Correct answer: C. Cell wall made of cellulose

1. The chapter contrasts plant and animal cells. 2. The cell wall lies outside the plasma membrane of plant cells. 3. It is made of cellulose and gives the cell rigidity. 4. Animal cells lack a cell wall. _Source: Selina Concise Biology Class 9, Ch 2 Cell, the Unit of Life (Mistral OCR'd PDF), section 2.7.1 Cell Wall_

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