Lec9, Brown

Question 1

• usually found in marine habitats, less than 1% of the species are from fresh water
• only multicellular species

Answer 1

Brown algae

Question 2

Major pigments of brown algae

Answer 2

1. chlorophylls a, c1, and c2,
   • 2. β-carotene,
   • 3. violaxanthin,
   • 4. diatoxanthin, and
   • 5. large amounts of fucoxanthin

Question 3

largest seaweed known

Answer 3

Macrocystis pyrifera.

Question 4

Most of ……….. are lithophytes

Answer 4

brown algae

Question 5

is generally stored in endoplasmic reticulum outside the chloroplast.

Answer 5

Laminarin

Question 6

is stalked and protrudes from the chloroplast.

Answer 6

Pyrenoid

Question 7

Asexual reproduction is absent in ……….. brown algae .

Answer 7

Laminaria

Question 8

produces meiospores (n) by meiosis which germinates and forms haploid gametophy

Answer 8

sporophyte (2n)

Question 9

can be commonly found as freefloating filaments. It can easily grow as epiphytes.

Answer 9

Ectocarpus

Question 10

distributed in tropical and subtropical waters ranging from midlittoral to sub-littoral zone

Answer 10

Sargassum

Question 11

• Thallus is woody, tall with terete main axis.
• The stipe may be short or long , cylindrical or branched.

Answer 11

Sargassum

Question 12

Commonly known as Kelps

Answer 12

LAMINARIA

Question 13

What makes Ectocarpus an excellent model system to study
molecular mechanisms related to stress factors.

Answer 13

The widespread distribution of it in different environmental conditions

Question 14

sporophytes are parenchymatous in nature

Answer 14

Laminaria

Question 15

leathery texture

Answer 15

Blade

Question 16

are also popular as sea vegetables

Answer 16

seaweeds

Question 17

brown seaweeds are consumed as food.

Answer 17

Fucus, Lamianria (kombu) and Undaria (wakame)

Question 18

salts of algenic acid composed of L-guluronic acid monomers and D-guluronic acid polymers are known as

Answer 18

alginates

Question 19

was being used for the fistula surgery

Answer 19

Laminaria stipes

Question 20

is being Used for headache cure

Answer 20

Nereocystis

Question 21

are being used for the treatment of blood cleansing and easing blood pressure.

Answer 21

Sargassum and Laminaria

Question 22

Ethanolic extracts of ……. has reported antioxidant activity.

Answer 22

Fucus