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Botany Question 11 – AP-EAMCET 2025

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Choose the correct statements among the following I. Quasi-fluid nature of lipids enable lateral movement of proteins. II. Mitochondria and chloroplast constitute endomembrane system. III. Phosphate granules are not membrane bound bodies. IV. Centriole is a component in all cells.

Recall the fluid mosaic model of the cell membrane and the components of the endomembrane system.

Step 1: Evaluate Statement I: Quasi-fluid nature of lipids and protein movement.✦ Active

Statement I says, 'Quasi-fluid nature of lipids enable lateral movement of proteins.' According to the fluid mosaic model of the cell membrane, the lipid bilayer is fluid, allowing both lipids and integral proteins to move laterally within the membrane. This fluidity is crucial for various membrane functions. Therefore, Statement I is correct.

💡 Teacher's Secret Hint

The fluid mosaic model, proposed by Singer and Nicolson, is a fundamental concept in understanding cell membrane dynamics.

Step 2: Evaluate Statement II: Mitochondria and chloroplast as part of the endomembrane system.○ Expand

Statement II says, 'Mitochondria and chloroplast constitute endomembrane system.' The endomembrane system includes the endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles, and the plasma membrane. Mitochondria and chloroplasts are semi-autonomous organelles with their own DNA and ribosomes, and they are not considered part of the endomembrane system. Therefore, Statement II is incorrect.

💡 Teacher's Secret Hint

Remember that mitochondria and chloroplasts have a double membrane and are thought to have originated from endosymbiosis, distinguishing them from the endomembrane system.

Step 3: Evaluate Statement III: Phosphate granules as non-membrane bound bodies.○ Expand

Statement III says, 'Phosphate granules are not membrane bound bodies.' Phosphate granules (also known as volutin granules or metachromatic granules) are inclusion bodies found in the cytoplasm of certain cells, particularly bacteria and some eukaryotic cells. They serve as storage sites for inorganic polyphosphate and are indeed not enclosed by a membrane. Therefore, Statement III is correct.

💡 Teacher's Secret Hint

Inclusion bodies like phosphate granules, glycogen granules, and lipid droplets are typically non-membrane bound storage structures.

Step 4: Evaluate Statement IV: Centriole as a component in all cells.○ Expand

Statement IV says, 'Centriole is a component in all cells.' Centrioles are cylindrical organelles involved in cell division and the formation of cilia and flagella. They are characteristic components of animal cells and some lower plant cells, but they are absent in higher plant cells and fungi. Therefore, Statement IV is incorrect.

💡 Teacher's Secret Hint

Higher plants form their spindle fibers during cell division without the involvement of centrioles.

Step 5: Identify the correct combination of statements.○ Expand

Based on the evaluation: - Statement I is correct. - Statement II is incorrect. - Statement III is correct. - Statement IV is incorrect. The correct statements are I and III. This corresponds to option 2.

💡 Teacher's Secret Hint

Always review all statements carefully before concluding, even if you find a correct option early.

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