Q. No.| Column I | Column II | ||
| A. | Cyanobacteria | P. | Asexual reproduction |
| B. | Archaebacteria | Q. | Silica cell wall |
| C. | Diatoms | R. | Methanogens |
| D. | Deuteromycetes | S. | Nitrogen fixation |
| A | B | C | D | |
| 1. | S | R | Q | P |
| 2. | Q | S | R | P |
| 3. | P | Q | S | R |
| 4. | R | S | P | Q |
Which of the following organisms are known as chief producers in the oceans?
| 1. | Dinoflagellates | 2. | Diatoms |
| 3. | Cyanobacteria | 4. | Euglenoids |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Photosynthetic protists with indestructible cell wall are
1. Pyrophytes
2. Chrysophytes
3. Euglenophytes
4. Myxomycetes
| List I | List II | ||
| A. | Diatoms | I. | Pellicle instead of cell wall |
| B. | Dinoflagellate | II. | Red tides |
| C. | Euglenoid | III. | Chief producers in oceans |
| D. | Sporozoan | IV. | Malaria |
1. A-IV, B-II, C-III, D-I
2. A-III, B-IV, C-I, D-II
3. A-III, B-II, C-I, D-IV
4. A-IV, B-I, C-II, D-III
Select the wrong statement:
| 1. | Diatoms are microscopic and float passively in water. |
| 2. | The walls of diatoms are easily destructible. |
| 3. | ‘Diatomaceous earth’ is formed by the cell walls of diatoms. |
| 4. | Diatoms are chief producers in the oceans. |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
| Assertion(A): | Cell wall of diatoms are indestructible |
| Reason(R): | Cell wall of diatoms possesss silica |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False statement |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
| 1. | It is a primary ingredient in the manufacture of plastics. |
| 2. | It is used in the filtration of oils and syrups due to its gritty texture. |
| 3. | It serves as a raw material for the production of biofuels. |
| 4. | It is utilized in the construction industry as a lightweight aggregate. |
| Column -I | Column-II |
| A. Plasmodium | (i) Diatoms |
| B. Mixotrophic nutrition | (ii) Euglenoids |
| C. Red tide | (iii) Dinoflagellates |
| D. Oceanic chief producers | (iv) Slime moulds |
1. A = (iv) , B = (ii) , C = (iii), D = (i)
2. A = (i) , B = (iv) , C = (iii), D = (ii)
3. A = (i) , B = (ii) , C = (iii), D = (iv)
4. A = (iv) , B = (iii) , C = (i), D = (ii)
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
| Column-I | Column-II | ||
| (a) | Diatoms | (i) | African sleeping sickness |
| (b) | Dinoflagellates | (ii) | Cell wall has stiff cellulosic plates |
| (c) | Flagellated protozoan | (iii) | Malaria |
| (d) | Sporozoan | (iv) | Cell wall embedded with silica |
1. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
2. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
3. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
4. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
The cell wall resembles a soapbox in the organism of which of the given kingdom according to Whittaker’s classification system?
1. Monera
2. Protista
3. Fungi
4. Plantae
© 2026 GoodEd Technologies Pvt. Ltd.