2.1 Autotrophic Protista

Question 1

Topic - Chrysophytes

Question 2

Found in fresh water and marine environments.
T/F

Answer 2

True

Question 3

Flagella is _____ (present/absent), so Chrysophytes float passively in water currents called ______.

Answer 3

Absent; Plankton

Question 4

Most Chrysophytes are photosynthetic.
T/F

Answer 4

True

Question 5

Chrysophytes includes:

Answer 5

I. Diatoms
II. Golden algae (desmids)

Question 6

Diatoms have _____ cell walls forming two thin overlapping shells, which fit together as in _____.

Answer 6

Siliceous Cell Wall; Soapbox

Question 7

Over billions of years:
Diatoms die, and left-behind Silica cell wall deposit found at the sea bed is known as ______.

Answer 7

Diatomaceous Earth

Question 8

______ is used in the polishing and filtration of oils and syrups.

Answer 8

Diatomaceous Earth

Question 9

Diatoms are the chief ‘producers’ in the oceans.
T/F

Answer 9

True

Question 10

Topic - Dinoflagellates

Question 11

Dinoflagellates are mostly ____ (marine/freshwater) and _____ (heterotrophic/photosynthetic).

Answer 11

Marine; Photosynthetic

Question 12

Some marine dinoflagellates show bioluminescence.
Example.

Answer 12

Noctiluca

Question 13

Based on the main pigments present in their cells,
Dinoflagellates appear ___, ___, ___, ___, ___.

Answer 13

yellow, green, brown, blue, or red

Question 14

The cell wall is made up of ______ on the outer
surface.

Answer 14

Stiff cellulose plates

Question 15

Most Dinoflagellates have two flagella:

Answer 15

One lies longitudinally, the other transversely in a furrow between the wall plates.

Question 16

______ is a movement shown by dinoflagellates having two flagella.

Answer 16

Whirling whip

Question 17

______ is red dinoflagellates that undergo rapid multiplication, making the sea appear ______.

Answer 17

Gonyaulax; Red (Red tides)

Question 18

Red dinoflagellates release ____ in a large no. that may kill other marine animals like fish.

Answer 18

Toxins (Saxitoxin)

Question 19

Topic - Euglenoids

Question 20

Euglenoids are mainly ____ (fresh/marine ) water organisms in stagnant water.

Answer 20

Freshwater

Question 21

Instead of a cell wall, Euglenoids have a protein-rich layer called ______ that makes their body flexible.

Answer 21

Pellicle

Question 22

Euglenoids have a nucleus and:
I. Cell mouth -
II. For osmoregulation -
III. Flagella -

Answer 22

I. Cytostome
II. Contractile vacuole
III. A short and one long Flagella

Question 23

They are photosynthetic in the presence of sunlight.
T/F

Answer 23

True

Question 24

In the absence of sunlight, they behave like ______ by predating on smaller organisms.

Answer 24

Heterotrophs

Question 25

In Euglenoids, ______ pigment is present that is identical to those in higher plants.

Answer 25

Chlorophyll-a

Question 26

Euglenoids reproduce and divide by longitudinal ______.

Answer 26

• Asexually (Binary fission)

Question 27

Example of Euglenoids.

Answer 27

Euglena (connecting link between plants and animals