Eyebrow Hairs Are Always Shorter Than Hairs on Your Head

question 64

Multiple Choice

Eyebrow hairs are always shorter than hairs on your head because ________.

• A) eyebrow follicles are only active for a few months
• B) hormones in the eyebrow follicle switch the growth off after it has reached a predetermined length
• C) they grow much slower
• D) the vascular supply of the eyebrow follicle is one-tenth that of the head hair follicle

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Definitions:

Casparian Strips

Regions of cell walls in plant roots that form a barrier to passive water and solute movement, helping to regulate water and nutrient uptake.

Photoperiodic Response

The physiological reaction of organisms to the length of night or day, affecting flowering, reproduction, and other seasonal activities.

Short-day Plant

Plants that require long nights (short days) to induce flowering.

Poinsettia

A plant with red and green foliage, often associated with Christmas.