21. Which animal is not a suspension feeder? a. Blue whale b. Whale shark c. Sna

Question

21. Which animal is not a suspension feeder? a. Blue whale b. Whale shark c. Snail d. Sardine 22. Which vitamin is required for human vision? a. Vitamin K b. Vitamin D c. Vitamin E d. Vitamin A 23. You discover a fossil of an organism that came from a deep marine environment. The fossil has no mouth or gastrointestinal tract, and your colleague thinks that it cannot be that of an animal. Is your colleague correct? a. Yes, because all animals have mouths. b. Yes, because all animals have gastrointestinal tracts. c. Yes, because all animals have both mouths and gastrointestinal tracts. d. No, because some animals lack both mouths and gastrointestinal tracts.

Explanation / Answer

22. (d) Vitamin A is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light (scotopic vision) and color vision.

23.(d) Apart from sponges and placozoans, almost all animals have an internal gut cavity which is lined with gastrodermal cells. In less advanced invertebrates such as the sea anemone, the mouthalso acts as an anus. Circular muscles around the mouth are able to relax or contract in order to open or close it.

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