CHAPTER 2: BIOLOGICAL CLASSIFICATION

Which of the following components provides sticky character to the bacterial cell?

Membranebound organelles are absent in

Select the wrong statement

A bacterium divides every 35 minutes. If a culture containing 10 ⁵ cells per ml is grown for 175 minutes, what will be the cell concentration per ml after 175 minutes

Select the wrong statement

Which of the following statements regarding cyanobacteria is incorrect?

Which of the following is correct about the slime mould?

Its thalloid body, Plasmodium has pseudopodia for locomotion and engulfing organic matter.

During unfavourable conditions Plasmodium differentiates and produces fruiting bodies, sporangium.

Spores posses no true cell wall.

They are dispersed by air current.

Being extremely resistant, spores survive for many years.

Plasmodium can grow upto several feet.

Choose the answer from the following options

Fungi are filamentous with the exception of “X”which is unicellular. Identify X

(i) Green algae occur in fresh water, brackish water, salt water.

(ii) Habitat of Brown algae-fresh water (rare), brackish water, salt water

(iii) Some red algae are found in fresh water, mostly occur in salt water, some are in brackish water.

(iv) Most of the red algae are multicellular.

(v) Red alga may occur in both well lighted regions close to water-surface and also at great depths in oceans where light penetration is little.

(vi) Cell wall of red algae consists of cellulose + agar.

(vii) 2 – 8, equal and apical flagella in green algae

Which of the following statements is not correct for viruses?

Identify A and B. Give the name of virus

Which one of the following option is correct for the given diagrams labelled as A, B, C, D and E ?

The figure below shows the structure of a bacteriophage. Identify its parts labelled as A, B, C and D.

Flagella of prokaryotic and eukaryotic cells differ in

Lichens indicate SO2 pollution because they