Double fertilization is exhibited by : (1) Algae (2) Fungi (3) Angiosperms (4) Gymnosperms

(b) Hippocampus, Exocoetus, Anabas

Economic importance of algae Algae have diverse economic uses. They perform half of the total carbon dioxidefixation on earth by photosynthesis, acting as the primary producers in aquatic habitats. (a) Food source:...

Gymnosperms and angiosperms are seed-producing plants with diplontic life cycles. In gymnosperms, the sporophylls are aggregated to form compact cones. The microsporophylls are broad and are not distinguished into filaments and...

(i) Red algae and brown algae Red algae Brown algae 1. Red algae are grouped under the class Rhodophyceae. 1. Brown algae are grouped under the class Phaeophyceae. 2. They contain floridean starch as stored...

Seeds are naked in gymnosperms, while they are covered in angiosperms. Gymnosperms do not bear flowers, while angiosperms bear flowers.

(a) blue green algae 

(a) saprophytic             (b) chitin            (c) lichens           (d) carbohydrate  (e) species               ...

(a)—B;          (b)—A;           (c)—D;           (d)—C;          (e)—F;        (f)—E,  (g)—G

(a) F     (b) T      (c) F      (d) T        (e) T     (f) T

(4) Syngamy and triple fusion