MTTC Missed Topics Practice Test

Endodermis tissue in plants is best described as a layer surrounding vascular tissue in roots; what does it do?

Found in the center of the stem; storage and internal support Layer surrounding vascular tissue in roots; controls what enters xylem Wispy, feathery clouds made of ice crystals that form at high levels; may indicate an approaching weather depression Big, fluffy clouds that indicate fair weather

Correct Answer:

Wispy, feathery clouds made of ice crystals that form at high levels; may indicate an approaching weather depression

Explanation:

Endodermis is the layer around the vascular tissue in roots that functions as a selective barrier, regulating what enters the xylem. Its cells have a casparian strip in their walls, which blocks the flow of substances through the cell walls (apoplastic route) and forces them to cross cell membranes, allowing the plant to control uptake of minerals and water. That precise role—layer surrounding vascular tissue in roots and controlling what gets into the xylem—fits the question. The other options describe unrelated ideas (inappropriate locations or nonplant concepts like clouds) and don’t describe this tissue's function.

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