Question

What defines the Benthic Zone of a lake?

1. It is the zone with the most abundant sunlight.
2. It is the surface layer of the water.
3. It comprises the floor or bottom of the lake.
4. It is located above the Open Water Zone.

• A. 3, 4
• B. 1 only
• C. 3 only
• D. All

Answer 1

Answer:

C. 3 only

• Lakes exhibit life zones

• Horizontal Zones division is on the basis of life forms existing in lakes

• 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.