Algae

Question 1

Some characters of algae are?

Answer 1

autotrophic , thalloid , non-flowering , non-vascular aquatic plant

Question 2

Algae are found in?

Answer 2

Marine , freshwater and also in brackish ecosystem

Question 3

Photosynthetic pigments are present in which part of chloroplast?

Answer 3

Thylakoids

Question 4

Reproduction takes place by how many methods?

Answer 4

By 3 methods
- Vegetative
- Sexual
- Asexual

Question 5

Is embryo stage present in alga? why?

Answer 5

No, because zygospore or zygote never forms embryo.

Question 5

Which is the most common type of reproduction in alga?

Answer 5

Vegetative propagation

Question 6

Sexual reproduction takes place by?

Answer 6

Isogamy, Anisogamy and Oogamy

Question 7

What are Chlorophyceae, Pheophyceae, Rhodophyceae and Cyanophyceae?

Answer 7

Chlorophyceae - Green Algae
Pheophyceae - Brown Algae
Rhodophyceae - Red Algae
Cyanophyceae - Blue green algae/ cyanobacteria

Question 8

Photosynthetic apparatus of different types of alga?

Answer 8

All have chromatophores as photosynthetic apparatus except for chlorophyceae

Question 9

Embryo in alga?

Answer 9

Absent

Question 10

Chlorophyceae (Green Algae) :

Answer 10

1. Green algae
2. Eukaryotes
3. Cell wall made up of cellulose and pectin
   4.Presence of chl-a and chl-b
4. All modes of reproduction
5. Photoautotrophic
   Eg : Volvox, Ulothrix, Chlamydomonas

Question 10

What is the reason for green color of chlorophyceae?

Answer 10

Due to presence of chlorophyll-a and chlorophyll-b

Question 11

Summer alga and winter alga are?

Answer 11

Spirogyra - summer alga
Ulothrix - winter alga

Question 12

Kelps are?

Answer 12

Brown algae

Question 13

Habitat of different types of alga?

Answer 13

Green algae - Freshwater or rarely in marine water
Brown algae - Marine water
Brown algae - Majorly in marine water and some in fresh water
BGA - Fresh or marine water

Question 14

Which type of alga is unicellular?

Answer 14

BGA

Question 15

Rhodophyceae (Red Algae) :

Answer 15

1. Found in marine water and rarely in fresh water
2. Eukaryotic cell
3. Photoautotrophic
4. Red color is due to presence of r- phycoerythrine and r - phycocynin
   Eg : Chondrus

Question 16

Pheophyceae (Brown algae) :

Answer 16

1. Found in Marine expect some specie
2. Sexual reproduction takes place by isogamy, isogamy and anisogamy.
3. Brown color is due to presence of brown pigment called fucoxanthin.
   Eg : Fucus

Question 17

Differences between Isogamy, Anisogamy and Oogamy.

Answer 17

Isogamy: Similar gametes (size/shape).
Anisogamy: Different gametes (size/shape).
Oogamy: A type of anisogamy with a clear distinction between a large, non-motile egg and a small, motile sperm.