I: | Diatoms are chief producers in the oceans |
II: | Diatoms are microscopic and float passively in water |
III: | The walls of diatoms are easily destructible |
IV: | 'Diatomaceous earth' is formed by the cell walls of diatoms |
I: | Viruses possess their own metabolic system |
II: | All viruses contain RNA and DNA |
III: | Viruses are obligate parasites |
IV: | Nucleic acid of virus is known as capsid |
(i) | These are commonly called sac fungi |
(ii) | These are mostly multicellular |
(iii) | They are saprotrophic, decomposers, parasitic or coprophilous |
(iv) | Their mycelium is aseptate |
(v) | Conidia produced by them are endogenous |
I: | is a cyanobacterium. |
II: | is photosynthetic autotroph. |
III: | is capable of fixing atmospheric nitrogen. |
Assertion (A): | Diatoms are the chief ‘producers’ in the oceans. |
Reason (R): | Diatoms are one of the most abundant and diverse groups of photosynthetic phytoplankton in the oceans. |
1. | Both (A) and (R) are True and (R) correctly explains (A). |
2. | Both (A) and (R) are True and (R) does not correctly explain (A). |
3. | (A) is True; (R) is False |
4. | Both (A) and (R) are False |
1. | Monera | 2. | Chrysophytes |
3. | Fungi | 4. | Slime molds |
1. | R.H. Whittaker | 2. | C.Linnaeus |
3. | A. Roxberg | 4. | Virchow |
I: | The majority of them are freshwater organisms found in stagnant water. |
II: | Instead of a cell wall, they have a protein rich layer called pellicle which makes their body flexible. |
III: | They have more than two flagella, on all sides of their body. |
IV: | The pigments of euglenoids are identical to those present in higher plants. |
1. | Monera | 2. | Protista |
3. | Fungi | 4. | Archaea |
I: | Protein coat is absent in a viroid but is present in a virus |
II: | Low molecular weight RNA is present in a virus but is absent in a viroid |