Multiple choice

Green Hydra remains green due to the presence of:

  1. green pigments in the epidermis

  2. green pigments in the endodermis

  3. green pigments in the mesoglea

  4. Zoochlorella algae in the endodermal cells

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The green color of Green Hydra comes from symbiotic Zoochlorella algae (Chlorella) living within the endodermal cells of the hydra. This is an example of mutualism where the algae provide food through photosynthesis and receive protection. The color is not due to pigments in epidermis, endodermis, or mesoglea.