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ICSE Class 9 Cell: The Unit of Life — practice questions

Explore 27 free Cell: The Unit of Life questions in ICSE Class 9 Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Cell: The Unit of Life questions and exercises with answers

Showing questions 1–27 of 27.

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 →Lysosomes are nicknamed 'suicide bags' because theyRead the answer and worked solution →Which plastid is responsible for the green colour of leaves?Read the answer and worked solution →Which organelle has rough and smooth forms?Read the answer and worked solution →Selina says the cells of an elephant and a rat areRead the answer and worked solution →Which organelle is double-membraned?Read the answer and worked solution →The third postulate of cell theory, added by Virchow, states thatRead the answer and worked solution →The fluid inside a permanent plant vacuole is calledRead the answer and worked solution →Cells stay small mainly to maintainRead the answer and worked solution →Which feature is found in animal cells but not plant cells?Read the answer and worked solution →Protein synthesis in the cell takes place atRead the answer and worked solution →Inside the nucleus, the nucleolus mainly producesRead the answer and worked solution →Which elements form most of the protoplasm?Read the answer and worked solution →Golgi apparatus is closely linked withRead the answer and worked solution →Bacterial cell word huntRead the answer and worked solution →Prokaryote or eukaryoteRead the answer and worked solution →Run through the cell basicsRead the answer and worked solution →Slice the prokaryote kitRead the answer and worked solution →Quick cell picksRead the answer and worked solution →Cell types, true or falseRead the answer and worked solution →Cell words and meaningsRead the answer and worked solution →Name the cell typesRead the answer and worked solution →Odd one out among cellsRead the answer and worked solution →Knock out the cell-type mythsRead 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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