Which of the following is correct for red tide causing organisms? (a) Stiff hemicellulosic plates on the inner surface of cell wall (b) Presence of non-contractile vacuole (c) Rapid multiplication by spores (d) Release toxins (e) Photosynthetic pigments as chlorophyll a & c (1) (b), (d) & (e) (2) (a), (b) & (c) (3) (d) & (e) only (4) (a), (c) & (e)
Answers
Answer:
3
Explanation:
a) can't be right as stiff cellulosic plates are present on the outer side
Answer:
(a) Stiff hemi cellulosic plates on the inner surface of cell wall (b) Presence of non-contractile vacuole (c) Rapid multiplication by spores (d) Release toxins (e) Photosynthetic pigments as chlorophyll. So the answer is (2) (a), (b) & (c) (3) (d) & (e) only.
Explanation:
(a) Dinoflagellates are microorganisms that have plates of cellulose for their cell walls.
(b) The only protists, dinoflagellates, lack a contractile vacuole. However, they do contain a non-contractile vacuole called a pustule, which is located close to the flagellar base. This pusule may participate in osmoregulation and flotation.
(c) Crimson dinoflagellates frequently undergo rapid multiplication, turning the sea red and causing red tides.
(d) Dinoflagellates are primarily marine, photosynthetic creatures.
(e) The emission of toxic substances in such huge quantities could potentially cause the death of fish.
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