Question

question 1-7
euglena
stimulus materials: euglena item set
euglena
euglena are unicellular, freshwater organisms that are very common in ponds and small bodies of water, especially if they are rich in nutrients and consequently high in algae. euglena feature both plant and animal characteristics. euglena are able to perform photosynthesis like plants. they can also get energy from consuming green algae.
a developer in the area decided to build a neighborhood in the forest surrounding a pond in which euglena were living. they cut down all the surrounding trees and treated the pond water with chemicals to kill the green algae. the pond was now receiving direct sunlight but did not have any algae growing in the water.
explain how the euglena are able to survive even though the algae are no longer present in the pond.

Explanation:

Euglena have both plant - like (photosynthesis) and animal - like (consuming green algae) characteristics. Since the algae are killed, Euglena can rely on their animal - like trait of consuming other organic matter or using stored energy, and also still perform photosynthesis with the direct sunlight the pond now receives (as they can photosynthesize like plants) to produce energy and survive.

Answer:

Euglena survive by using their dual (plant - animal) characteristics. They can perform photosynthesis with direct sunlight (plant - like) and obtain energy by consuming other organic matter in the pond (animal - like) since they no longer rely solely on algae for food.