Question

- Duckweed consists of tiny, free-floating green plants. Duckweed typically consists of a leaf or cluster of leaves with small roots
that hang down into the water; leaves and stem are not distinguishable from each other. It occurs on the surface of ponds, inlet
creeks, and ditches. It and can exist as floating mats on the water's surface. Which of these accurately describes the likely effect
that duckweed has on the submerged plant populations in the lakes where duckweed is found?
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Duckweed can provide the nutrients for the submerged plants, causing
their populations to increase.
Duckweed can outcompete submerged plants for light, and the submerged
plant populations can decrease.
Duckweed can increase the submerged plant populations by purifying the
water in and around the submerged plants.
Duckweed will have no impact on submerged plant populations since
duckweed floats on top and submerged plants are found lower in the lake.

Answer 1

Duckweeds will block the sunlight entering the water and thereby decrease the population of submerged plants.

Option B

Explanation:

Duckweeds are a deadly weed that grows on the surface of water bodies like lakes and ponds. The population of these plants increase to a huge extent because of the fertilizers that drain into these water bodies from the nearby agricultural fields.This is called eutrophication.

Now these plants form a layer covering the surface of the water bodies. This leads to blocking the sunlight from entering inside the water. This leads to sunlight deficiency inside the water body. Thus the plants that are growing on the bottom of these water bodies cannot get sunlight and thus dies.