Question

Which statement best describes the relationship between lake zones and light penetration?

1. Light penetrates fully to the bottom in all lake zones.
2. The Littoral Zone receives light to the bottom, while the Open Water Zone does not.
3. Light penetration is primarily determined by the depth of the Benthic Zone.
4. The Open Water Zone is defined by its complete lack of light.

• A. ii only
• B. iv only
• C. All
• D. ii, iii

Answer 1

Answer:

A. ii only

• Littoral zone - This is the shallow water zone, near the shore, where light penetrates to the bottom. Rooted plants can grow only in this region.

• Open Water Zone - This zone extends beyond the littoral zone and is too deep for light to penetrate till the bottom and for rooted plants to grow.

• Benthic Zone - This zone forms the floor of the lake and underlies the littoral and limnetic zone.