(2) At sunrise, the river is redder than the fire, and in spring, the river is as green as blue. It is about algae, which is characterized by rootlessness and stem-leaf differentiation;
(3) The arrow is crisp and sweet, and the fern bud is tender, which is about ① fern, characterized by the differentiation of roots, stems and leaves into conducting tissues;
(4) Looking at the golden pine in the boundless spring scenery, it still flies around calmly, talking about gymnosperms, which is characterized by bare seeds and fruitless capsules;
(5) There are a few plums in the corner, and Ling Han blooms alone, which is probably an angiosperm, and its characteristic is that the pericarp is wrapped outside the seeds.
So, the answer is: (1) 37;
(2)④⑨;
(3)①⑥;
(4)②⑧;
(5)⑤⑩.