BIOLOGY (FOR FINAL)__LEC: 1

BIOLOGY (FOR FINAL)__LEC: 1 BY SIR FIDA HASSAN UNIVERSITY OF PESHAWAR TOPIC: {ALGAE} https://youtu.be/gWnm0Cn6seE DATE: 18/01/2021

1 ALGAE

2 ALGAE 1st plants to appear on earth Multicellular Non-Vascular
No true root, stems, leaves, or tubes to transport materialsNo seedsMust live in or near water3 types of algae separated by a pigment color

3 TYPES OF ALGAEBrown AlgaeRed AlgaeGreen Algae

4 BROWN ALGAE Float on or near-surface of saltwater
Held up by sacs called Air BladdersProvide a home for many sea animalsEx.Sargassum, kelp, rockweed

5 BROWN ALGAE USES: Food for Humans and livestock Algins
used in salad dressings to make them smooth and keep them from separatingThickening agent in ice cream and marshmallows

6 RED ALGAE Many different shapes Usually grow attached to rocks
Clumps of delicate red threadsLarge rounded, flat sheetsHard stiff branchesUsually grow attached to rocksLive deeper in the ocean than any other algae

7 RED ALGAERed pigments transfer the small amount of light to the chlorophyll for photosynthesisUses:FoodFertilizerCarrageenans: in foods, jellies, lotionsAgar- used in science labs

8 GREEN ALGAE Live in freshwater Some live with Fungi (Lichen)
Some live in the bodies of worms, sponges, or protistsLand plants are believed to have evolved from green algae

9 GREEN ALGAE Land plants are believed to have evolved from green algae
-have similar life cycles, pigments, and stored food supplies.