Consider the following statement with respect to Mycoplasma
a. They lack cell wall.
b. They are the largest living cell.
c. They can survive without oxygen
d. They are pathogenic to animals only.
The correct statements are
1. b & d
2. b & c
3. a & c
4. a & d
I: | In diatoms, the cell walls form two thin overlapping shells which fit together as in a soap box |
II: | The walls are embedded with silica and thus are indestructible |
III: | The fossilized diatoms are called diatomaceous earth |
IV: | Diatoms are not the main producers in the oceans |
V: | Diatomaceous earth is used in polishing, filtration of oil and syrups |
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 |
I: | Their body consists of long, slender thread-like structures called hyphae |
II: | The network of hyphae is called mycelium |
III: | Hyphae may be continuous tubes filled with multinucleated cytoplasm, these hyphae are coenocytic |
IV: | In many cases hyphae have septate or cross walls |
V: | The cell wall of fungi are composed by chitin and polysaccharides |