With reference to the cell, consider the following statements:

1. Each cell acquires its structure and ability to function because of the organization of its membrane and organelles in specific ways.

2. Cells are enclosed by a plasma membrane composed of lipids and proteins.

3. Most plant cells have large membranous organelles called plastids, which are of two types – chromoplasts and leucoplasts.

Which of the above statement is/are correct?

  1. 1 and 2 only
  2. 2 and 3 only
  3. 3 only
  4. 1, 2, and 3
1 and 2 only

Correct Answer: 1 and 2 only

Key Points

  • Each cell’s structure and function are determined by its membrane and organelle organization.
  • The plasma membrane is primarily composed of lipids and proteins, forming a barrier for the cell.
  • Plant cells contain plastids, which are essential for various functions, including photosynthesis and storage.
  • Chromoplasts and leucoplasts are two types of plastids found in plant cells, each serving different roles.

Why Other Options Are Wrong

  • Option 2 (2 and 3 only) is incorrect because while statement 2 is true, statement 3 is partially misleading. Not all plant cells contain plastids, as some may lack them.
  • Option 3 (3 only) is incorrect because it disregards the validity of statements 1 and 2, which are both accurate regarding cell structure and function.
  • Option 4 (1, 2, and 3) is incorrect since statement 3 is not universally applicable to all plant cells, making this option invalid.

Quick Tip for Exam

When answering questions about cell biology, focus on the specific functions and structures of organelles. Remember that not all statements may apply universally, especially in the case of plant cells and their organelles.

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