The red tides in the ocean are primarily caused by the rapid multiplication of: MCQ with Answer and Explanation

Explanation:
Phagocytosis ('cell eating') is the engulfment of large particles or microbes by the cell membrane forming a phagosome. Pinocytosis is 'cell drinking' of liquids. Exocytosis is secretion.

Explanation:
Vascular cryptogams are plants that possess vascular tissues (xylem and phloem) but reproduce via spores rather than seeds. Pteridophytes, such as Selaginella (spike moss), ferns, and Equisetum, fit this description. Funaria and Marchantia are bryophytes (non-vascular cryptogams), and Pinus is a gymnosperm (a vascular phanerogam or seed-producing plant).

Explanation:
Vitamin A is essential for the synthesis of rhodopsin. Deficiency leads to impaired dark adaptation (night blindness) and eventually xerophthalmia. Beri-beri is B₁ deficiency, pellagra B₃, scurvy vitamin C.