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Cell-Structure and Functions

Description: VIII, Biology, Science, Cell, Cell-Structure and Functions
Number of Questions: 15
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Tags: Cell-Structure and Functions Science Biology VIII Cell - Structure and Functions Cell, Variety in Cell Number, Shape and Size Cell Structure, Function, Camparison of Plant and Animal Cells.
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Match the following:

Column I Column II
A. Chloroplast 1. Imparting attractive colours to flowers and fruits
B. Chromoplast 2. Storage of starch, oil and proteins
C. Leucoplast 3. Involvement in photosynthesis

  1. A - 1, B - 2, C - 3

  2. A - 2, B - 3, C - 1

  3. A - 3, B - 1, C - 2

  4. A - 3, B - 2, C - 1

  5. A - 2, B - 3, C - 1

Show answer
Correct Option: C
Explanation:

All are correctly matched.   Chloroplast : Involvement in photosynthesis Chromoplast : Imparting attractive colours to flowers and fruits Leucoplast : Storage of starch, oil and proteins

Who was the first scientists observed cell structure under a simple magnifying device?

  1. Zacharias Jansen

  2. Anton van Leeuwenhoek

  3. Robert Hooke

  4. Hans Busch

  5. Ernst Ruska

Show answer
Correct Option: C
Explanation:

Robert Hooke was the first person to observe cell structure under a simple magnifying device invented by him in 1665.

Which of the following organisms is acellular?

  1. Ameoba

  2. Bacteria

  3. Virus

  4. All of the above

  5. None of the above

Show answer
Correct Option: C
Explanation:

Virus is an acellular organism.

______________ are spherical or rod-shaped organelles that are separated from cytoplasm by the membrane and provide energy for the activities of the cell.

  1. Plastids

  2. Mitochondria

  3. Vacuoles

  4. Chloroplasts

  5. Lysosomes

Show answer
Correct Option: B
Explanation:

Mitochondria are spherical or rod-shaped organelles. They are separated from cytoplasm by the membrane and provide energy for the activities of the cell.

Which of the following pairs of cell organelles and their functions is correctly matched?

  1. Mitochondrion - It provides and maintains the shape of the cell, and prevents it from drying.

  2. Ribosomes - They are suicidal bags and they help in digestion of foreign, worn out cells and cell organelles.

  3. Plasma membrane - It gives shape to the cell and regulates the transportation of materials in and out of the cells.

  4. Lysosomes - They help in protein synthesis.

  5. Cell wall - It is a network of membranes and provides a large surface area for the life functions to take place.

Show answer
Correct Option: C
Explanation:

This option is correct. Plasma membrane gives shape to the cell and regulates the transportation of materials in and out of the cells.

A major percentage of protoplasm is mainly made up of elements, which are found in the form of chemical compounds. Which of the following elements does not form a part of protoplasm?

  1. Carbohydrates

  2. Proteins

  3. Carbon

  4. Fats

  5. Water

Show answer
Correct Option: C
Explanation:

99% of protoplasm is mainly made up of elements,  which are found in the form of chemical compounds. Both elements and compounds in the unique combination provide living nature to the protoplasm. Carbohydrates, proteins, fats and water are found in it.

Which of the following statements is correct?

  1. A hen's egg is a cell, which can be seen with a naked eye.

  2. Plastids are only green in colour.

  3. Ribosomes are the smallest cell organelles without proteins.

  4. Nucleus is called the kitchen of the cells.

  5. The size of the cell depends upon the size of the organism.

Show answer
Correct Option: A
Explanation:

This is the correct statement. A hen's egg is a cell,  which can be seen with a naked eye.

The plant cell wall _______________.

  1. is the power house of the cell.

  2. is round shaped

  3. is made of cellulose.

  4. can change its shape

  5. contain chloroplast

Show answer
Correct Option: C
Explanation:

The plant cell wall is made of cellulose.

Which of the following statements is/are incorrect?

(a) Nucleus is found in chromosomes. (b) Cells are the basic structural units of living organisms. (c) The nature of cell membrane regulates the movement of materials.

  1. Only (a)

  2. Only (b)

  3. Only (c)

  4. Both (a) and (b)

  5. Both (b) and (c)

Show answer
Correct Option: A
Explanation:

This is an incorrect statement. Chromosomes are found in nucleus.

Which of the following options is the function of chromosome in a cell?

  1. It separates the contents of the cells from the surrounding medium.

  2. It contains organelles, which control and coordinate the activities of our body.

  3. It carries genes and helps in inheritance of characters from parents to offspring.

  4. It is helpful in the formation of the cell wall.

  5. It helps in protein synthesis.

Show answer
Correct Option: C
Explanation:

Chromosomes are found in necleus of a cell. They carry genes and help in inheritance of characters from parents to offspring.

Which of the following cell components is the living substance of the cell?

  1. Centrosome

  2. Nucleus

  3. Mitochondria

  4. Cytoplasm

  5. Protoplasm

Show answer
Correct Option: E
Explanation:

Protoplasm is the living substance of the cell.

Which of the following is a characteristic of prokaryotic cells?

  1. The nucleus is present.

  2. Cell division is mitotic or meiotic.

  3. They have more than one chromosome.

  4. Nuclear region is surrounded by a nuclear membrane.

  5. DNA is circular.

Show answer
Correct Option: E
Explanation:

In a prokaryotic cell DNA is circular and lies free in the cytoplasm.

Which of the following is incorrect?

  1. Cytoplasm contains organelles.
  2. Nucleus is spherical in shape and is located in the centre of the cell.
  3. Nerve cells are the smallest cells of the body.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1, 2, and 3

  5. 1 and 2

Show answer
Correct Option: C
Explanation:

 Nerve cells are the biggest cells of the body. The smallest cell is bacteria. The smallest cell in the human body is the red blood cell.

Which of the following is pseudopedia?

  1. The movement of substances or materials.

  2. The protruding projection, which helps in movement and feeding.

  3. The coloured bodies in the cytoplasm of the cells.

  4. The function of cellular respiration.

  5. The transfer of hereditary characteristics.

Show answer
Correct Option: B
Explanation:

The protruding projection,  which helps in movement and feeding of ameoba is called pseudopedia.

Match the Column I with Column II:

Column I
Column II
A. Plant cells 1. Cells with nuclear material
B. Animal cells 2. Cells without nuclear membranes
C. Prokaryotic cells 3. Absent cell wall
D. Eukaryotic cells 4. Large vacuole

  1. A - 1, B - 2, C - 3, D - 4

  2. A - 2, B - 1, C - 3, D - 4

  3. A - 3, B - 4, C - 1, D - 2

  4. A - 4, B - 3, C - 2, D - 1

  5. A - 4, B - 2, C - 3, D - 1

Show answer
Correct Option: D
Explanation:

 Plant cells- Large vacuoles Animal cells- Absent cell wall Prokayrotic cells- Cells without nuclear membranes Eukyrotic cells- Cells having nuclear material

This is the correct matching.

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