The movement of water through the apoplast pathway does NOT cross which layer in the root? MCQ with Answer and Explanation

The movement of water through the apoplast pathway does NOT cross which layer in the root?
A. Pericycle
B. Epidermis
C. Endodermis
D. Cortex
Answer: Option C
Solution (By JKSSB Mock Tests)
In the apoplast pathway, water moves through cell walls and intercellular spaces without crossing membranes. However, at the endodermis, the Casparian strip (suberin deposition) blocks apoplastic movement, forcing water to enter the symplast (via plasma membrane). Thus, apoplastic movement stops at the endodermis. This ensures selective uptake of minerals.

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Practice More Biology Questions

Question #1
In which cell organelle does the Krebs cycle take place?
A. Stroma of chloroplast
B. Mitochondrial matrix
C. Inner mitochondrial membrane
D. Cytoplasm

Correct Answer: Option B


Explanation:
The Krebs cycle (citric acid cycle) occurs in the mitochondrial matrix in eukaryotes. It oxidizes acetyl-CoA to CO₂, producing NADH, FADH₂, and GTP. The inner membrane houses the electron transport chain. Glycolysis occurs in cytoplasm, the Calvin cycle in chloroplast stroma. The matrix contains the necessary soluble enzymes.

This question belongs to: Science Biology
Question #2
The disease 'anemia' is most commonly caused by deficiency of:
A. Magnesium
B. Iron
C. Iodine
D. Calcium

Correct Answer: Option B


Explanation:
Iron-deficiency anemia is the most prevalent nutritional deficiency worldwide, characterized by fatigue, pallor, and reduced oxygen-carrying capacity. It is treated with iron supplementation and dietary changes.

This question belongs to: Science Biology
Question #3
The organelle that is the site of the Krebs cycle in the cell is the:
A. Inner mitochondrial membrane
B. Chloroplast stroma
C. Mitochondrial matrix
D. Cytoplasm

Correct Answer: Option C


Explanation:
The Krebs cycle (citric acid cycle) occurs in the mitochondrial matrix in eukaryotes. The enzymes for the cycle are soluble in the matrix. The inner membrane houses the electron transport chain and ATP synthase. Cytoplasm is the site of glycolysis, chloroplast stroma is the site of the Calvin cycle. Thus, the matrix is the correct location.

This question belongs to: Science Biology