With reference to the cell structure described in the text, consider the following statements: 1. The cell membrane encloses the cell and controls the movement of substances. 2. The nucleus is a jelly-like substance that fills the entire cell. 3. Cytoplasm is the hard outer covering found only in plant cells. Which of the statements given above is/are correct?

The correct option is (a). Explanation A typical cell consists of three fundamental components: the cell membrane, the cytoplasm, and the nucleus. Each component possesses distinct structural properties and functions vital for cellular life. - Statement 1 is Correct: The cell membrane (also known as the plasma membrane) is the boundary that encloses the cell, separating it from the external environment. It is porous and selectively permeable, meaning it regulates the movement of substances into and out of the cell. - Statement 2 is Incorrect: The nucleus is a distinct, usually spherical organelle that functions as the control center of the cell. It is not the jelly-like substance filling the cell. The jelly-like substance located between the cell membrane and the nucleus is called the cytoplasm. - Statement 3 is Incorrect: Cytoplasm is the fluid medium within the cell membrane containing various organelles. The hard, rigid outer covering found specifically in plant cells (external to the cell membrane) is the cell wall, which provides protection and structure. Key Takeaway: The cell membrane acts as a selective barrier, the cytoplasm is the internal fluid medium, and the nucleus serves as the central regulatory organelle. The cell wall is a rigid protective layer found in plant cells, distinct from the cytoplasm.

With reference to the cell structure… - NCERT Class 7 Science MCQ

NCERT Class 7 Science — Chapter 1: Nutrition in plants

mcqmedium

With reference to the cell structure described in the text, consider the following statements:

The cell membrane encloses the cell and controls the movement of substances.
The nucleus is a jelly-like substance that fills the entire cell.
Cytoplasm is the hard outer covering found only in plant cells.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 7 · Page 2

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (a).

Explanation

A typical cell consists of three fundamental components: the cell membrane, the cytoplasm, and the nucleus. Each component possesses distinct structural properties and functions vital for cellular life.

Statement 1 is Correct: The cell membrane (also known as the plasma membrane) is the boundary that encloses the cell, separating it from the external environment. It is porous and selectively permeable, meaning it regulates the movement of substances into and out of the cell.
Statement 2 is Incorrect: The nucleus is a distinct, usually spherical organelle that functions as the control center of the cell. It is not the jelly-like substance filling the cell. The jelly-like substance located between the cell membrane and the nucleus is called the cytoplasm.
Statement 3 is Incorrect: Cytoplasm is the fluid medium within the cell membrane containing various organelles. The hard, rigid outer covering found specifically in plant cells (external to the cell membrane) is the cell wall, which provides protection and structure.

Key Takeaway: The cell membrane acts as a selective barrier, the cytoplasm is the internal fluid medium, and the nucleus serves as the central regulatory organelle. The cell wall is a rigid protective layer found in plant cells, distinct from the cytoplasm.

Your note

More from Chapter 1: Nutrition in plants

Consider the following statements regarding the relationship between legumes and Rhizobium: 1. It is an example of a symbiotic relationship. 2. The bacteria provide food and shelter to the plant. 3. The plant provides nitrogen to the bacteria. Which of the statements given above is/are correct?

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With reference to saprotrophic nutrition, consider the following statements: 1. It is a mode of nutrition where organisms take in nutrients from dead and decaying matter. 2. Fungi ingest dead matter directly without secreting digestive juices. 3. All fungi are harmful and cause spoilage of food and diseases. Which of the statements given above is/are correct?

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Consider the following statements about the transport system in plants: 1. Roots absorb water and minerals from the soil. 2. The transport vessels are restricted to the roots and do not reach the stem. 3. The vessels form a continuous network reaching the leaves. Which of the statements given above is/are correct?

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Which one of the following crops is a legume capable of symbiotic nitrogen fixation via Rhizobium?

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Consider the following statements about the digestive process in saprotrophs: 1. They digest food externally before ingestion. 2. They secrete digestive juices inside their bodies. 3. They absorb nutrients in solution form. Which of the statements given above is/are correct?

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Keep practising Chapter 1: Nutrition in plants

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