Class 11 · Cell: The Unit of Life

Cell Organelles: Structure and Function — NEET Biology

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Let us now look at individual cell organelles to understand their structure and functions.

NCERT Biology · Class 11 · Chapter 8 · Paragraph 32
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Which of the following statements are correct regarding the comparison of onion peel cells (plant cell) and human cheek cells (animal cell)? S1: Both onion peel cells and human cheek cells are enclosed by a distinct cell wall as their outermost boundary. S2: The cytoplasm in both cell types is the main arena of cellular activities and contains non-membrane bound organelles like ribosomes. S3: Plastids, which are responsible for diverse functions including photosynthesis and storage, are characteristic features of onion peel cells but are absent in human cheek cells. S4: A large central vacuole, occupying up to 90% of the cell volume, is a unique feature of mature plant cells like onion peel cells, while animal cells like human cheek cells typically lack them or have small, temporary ones. S5: Centrioles, which play a crucial role in cell division, are present in almost all animal cells including human cheek cells, but are generally absent in plant cells.

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