Jake Is Nearsighted, and His Cousin Janelle Is Farsighted

question 451

Multiple Choice

Jake is nearsighted, and his cousin Janelle is farsighted. Their visual problems are caused by the fact that:

• A) images are not properly focused on the retina.
• B) the cornea is clouded due to age or disease.
• C) the size of the blind spot has increased.
• D) the pupil no longer dilates in dim light.

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Definitions:

Vascular Tissue

The complex tissue in plants that conducts water and nutrients through the plant body.

Cortex

The outer layer of various organs or structures, such as the brain's cerebral cortex, involved in high-level functions including consciousness, memory, and thought, or the kidney's cortex, involved in filtration and blood processing.

Tracheids

Water-conducting cells in the xylem of vascular plants that are elongated, with thickened cell walls and tapered ends, contributing to the support and transportation of water and minerals.

Vessel Elements

Shorter, wider plant cells than tracheids, found in the xylem, which efficiently transport water and nutrients vertically through the plant.