Which cells in a root form a protective barrier to the vascular system where all materials must move through the symplast?

A) pericycle
B) cortex
C) epidermis
D) endodermis
E) exodermis


Answer: D

Biology & Microbiology

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How did the cessation of crossing-over contribute to the disparity between the X and Y chromosomes? What will be an ideal response?

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Which term refers to the selectively permeable barrier that is present in the innermost layer of the root cortex?

a. pericycle b. root hairs c. endodermis d. quiescent centre

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Which sequence of events is required for the brain to interpret sound?I.Vibration of the basilar membrane relative to the tectorial membrane causes cilia on hair cells to bend and triggers depolarization.II.Hair cells stimulate the production of action potentials in sensory neurons that project to the brain.III.Ganglion cell axons transmit action potentials to the occipital lobe.

A. II then I B. III then I then II C. I then II D. III then I E. I then II then III

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