- 1(current)
Q. No.Identify the organism that shows the following characteristics.
(a) Zygotic meiosis
(b) Causes red tide of the sea
(c) Mesokaryon organisation
(d) Whirling whips
1. Noctiluca
2. Gonyaulax
3. Melosira
4. Navicula
Red tides are due to the rapid multiplication of
1. Cyanobacteria
2. Chlamydomonas
3. Gonyaulax
4. Diatoms
Red tides in the sea are because of
(1) Red dinoflagellates
(2) Geladium
(3) Red Chrysophytes
(4) Red algae
Dinoflagellates- do not possess which feature?
(1) Marine and photosynthetic
(2) Variety in colors
(3) Cell wall with silica
(4) Two flagella
Organisms responsible for causing ‘red tide’ are also
characterized by
1. Presence of stiff cellulosic plates.
2. Obligate saprophyte.
3. Presence of two longitudinal flagella.
4. Filamentous body made up of trichomes.
Which of the following property belongs to Dinoflagellates?
(1) Loose cellulose plates in cell wall
(2) The outer surface has more loosening of cell wall than inner
(3) Rapid multiplication
(4) Not harmful for others
Which of the following is not associated with red tides
(1) Harmful for marine organisms
(2) Gonyaulax
(3) Seen in fresh water
(4) Color is due to pigment in the cell of Dinoflagellates
Match each item in Column I with one in Column II and select your answer from the codes given below:
| Column I | Column II | ||
| A. | Diatoms | a. | Protein-rich layer of pellicle |
| B. | Dinoflagellates | b. | Cell wall embedded with silica |
| C. | Euglenoids | c. | Spores with true walls |
| D. | Slime moulds | d. | Cellulose plates in the cell wall |
Codes:
| A | B | C | D | |
| 1. | b | a | c | d |
| 2. | b | d | a | c |
| 3. | b | c | a | d |
| 4. | b | a | d | c |
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.