• The Fundamental Unit of Life - 2 (Class - IX)
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The Fundamental Unit of Life - 2 (Class - IX)

Description: The Fundamental Unit of Life - 2
Number of Questions: 15
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Tags: The Fundamental Unit of Life - 2 Cell and Its Types Transport across Cell Membrane Types and Functions of Organelles Cell Wall - Structure and Functions Nucleus - Structure and Functions
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Cell wall is a rigid wall that lies outside the plasma membrane. Which of the following is not a function of a cell wall?

  1. It regulates the cell cycle.

  2. It has narrow pores through which fine strands of cytoplasm are able to pass.

  3. It permits the plant to become turgid.

  4. It provides mechanical strength and support to the cell.

  5. It is freely permeable to water and substances in solution.

Show answer
Correct Option: A
Explanation:

This is the correct answer as this is not a function of a cell wall. The nucleus regulates the cell cycle.

In which of the following stages of mitosis do chromosomes decondense and lose their individuality after having reached their respective poles?

  1. Anaphase

  2. Metaphase

  3. Prophase

  4. Telophase

  5. None of these

Show answer
Correct Option: D
Explanation:

This is the correct option. In telophase, chromosomes decondense and lose their individuality after having reached their respective poles.

In which of the following phases do sister chromatids separate forming two identical daughter chromosomes

  1. Anaphase

  2. Telophase

  3. Cytokinesis

  4. Karyokinesis

  5. Prophase

Show answer
Correct Option: A
Explanation:

This is the correct option as the separation of the daughter chromatids occurs in this phase

Which of the following is not a function of nuclear membrane?

  1. It separates the nucleus from cytoplasm.

  2. It provides flexibility to the cell.

  3. It allows the movement of material between the nucleus and cytoplasm.

  4. It contains the genetic material present inside the chromosomes.

Show answer
Correct Option: B
Explanation:

Nuclear membrane is the outer membrane of the nucleus that allows the movement of materials between the nucleus and cytoplasm. It does not provide flexibility to the cell.

In the nucleus of each cell, each chromosome is made up of

  1. DNA and histone

  2. RNA and histone

  3. DNA and glycoprotein

  4. RNA and glycoprotein

  5. None of these

Show answer
Correct Option: A
Explanation:

Yes, it is correct. Each chromosome is made up of DNA. It is tightly coiled many times around proteins and histones, which support its structure.

A cell membrane is made of

  1. lipids

  2. phospholipids

  3. bilayer of phospholipids

  4. protein only

Show answer
Correct Option: C
Explanation:

A cell membrane is made up of bilayer of phospholipids. Phospholipids are made up of two fatty acids (long chains of hydrogen and carbon molecules), which are attached to a glycerol 'head'. The glycerol molecule is also attached to a phosphate group, and this is the hydrophilic part of the molecule. The 'tail' end of the fatty acid chains opposite the glycerol is the hydrophobic part of the molecule.

Which of the following organelles, which help in cell division, is/are found in animal cells only?

  1. Plastids

  2. Centrioles

  3. Ribosomes

  4. Golgi apparatus

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct. Centrioles are found in animal cells only.

Choose the correct statement with respect to unicellular organisms.

  1. In unicellular organisms, tissues work in coordination to perform different functions.

  2. Unicellular organisms do not require food.

  3. Unicellular organisms respire and reproduce.

  4. All unicellular organisms move by cilia.

Show answer
Correct Option: C
Explanation:

Unicellular organisms respire and reproduce.

Match the following: Type of bacterium|Shape| |a. Bacillus|1. Comma-shaped| |b. Coccus|2. Rod-shaped| |c. Vibrio|3. Spherical-shaped|

  1. a - 1, b - 3, c - 2

  2. a - 3, b - 2, c - 1

  3. a - 2, b - 3, c - 1

  4. a - 2, b - 1, c - 3

  5. a - 1, b - 2, c - 3

Show answer
Correct Option: C
Explanation:

The bacterium Bacillus is rod-shaped. The bacterium Coccus is spherical-shaped. The bacterium Vibrio is comma-shaped.

Which of the following pairs is correctly matched?

  1. Mitochondria – Production of ATP

  2. Golgi body – Synthesis of protein

  3. Lysosome – Synthesis of fats and lipids

  4. Ribosomes – Destruction of foreign substances

Show answer
Correct Option: A
Explanation:

Mitochondria – Production of ATP Mitochondria are the energy factories of the cells. The energy currency for the work that animals must do is the energy-rich molecule adenosine triphosphate (ATP). ATP is produced in the mitochondria using energy stored in food.

Which of the following statements is/are false?

a. Chloroplasts are not found in the root cells of a plant. b. The organelles containing pigments present in the cytoplasm of plant cells are called vacuoles. c. The red colour of tomatoes is due to the presence of red-coloured plastids in their cells.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c

Show answer
Correct Option: C
Explanation:

This is the correct option as this statement is false. The organelles containing pigments present in the cytoplasm of plant cells are called plastids.

Which of following pairs of ‘cell organelle - corresponding function’ is/are incorrectly matched?

  1. Rough endoplasmic reticulum - Protein synthesis
  2. Mitochondria - Lecithin synthesis
  3. Chloroplast - Digestion of food particles

  1. Only 1

  2. Only 2

  3. Only 3

  4. Both 1 and 2

  5. Both 2 and 3

Show answer
Correct Option: C
Explanation:
  1. Rough endoplasmic reticulum is specialised in synthesising proteins.
    1. Some of the enzymes have been located in mitochondria which help in the synthesis of lipids like lecithin from fatty acids and glycerol.
    2. Chloroplast stroma contains enzymes for conversion of carbon dioxide into carbohydrates. Lysosomes help in intracellular digestion of food particles.

Which of the following cells are bean-shaped?

  1. Muscle cells

  2. Guard cells of stomatal pores

  3. Nerve cells

  4. White blood cells

Show answer
Correct Option: B
Explanation:

Guard cells of stomatal pores are bean-shaped. The guard cells contain chloroplasts, so they can manufacture food by photosynthesis.

Which of the following terms describes the movement of water from a region of higher concentration to a region of lower concentration through a semipermeable membrane?

  1. Diffusion

  2. Osmosis

  3. Endocytosis

  4. Plasmolysis

Show answer
Correct Option: B
Explanation:

The movement of water from a region of higher concentration to a region of lower concentration through a semipermeable membrane is called osmosis.

Which of the following statements are correct about cell wall? a. It is made of a complex carbohydrate called cellulose. b. It is found in both plant and animal cells. c. It is semi-permeable. d. It is hard and rigid.

  1. Only a and b

  2. Only a and c

  3. Only a and d

  4. All a, b, c and d

  5. None of these

Show answer
Correct Option: C
Explanation:

Both the statements are correct about cell wall. Cell wall is made of a complex carbohydrate called cellulose. It is hard and rigid.

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