Biology · Science General

Diversity in Living Organisms

3,829 Questions

The diversity in living organisms deals with the classification of life forms into various kingdoms and phyla. This topic covers specific traits of bacteria, animal body cavities, and structural adaptations for survival. These fundamentals are crucial for biology sections in medical entrance and state board exams.

Animal phyla characteristicsBacteria and flagellaBiological adaptationsKingdom Animalia classificationBody cavity typesExtinct organism subphylaJawless animals identification

Diversity in Living Organisms Questions

Multiple choice

Which of the following statements are TRUE regarding bacteria? P. The bacterial cell wall is composed of chitin. Q. The cytoplasm of a bacterium is supported by microtubules. R. A gram-positive bacterium is stained purple by the gram stain. S. Bacterial flagella propel the cell by using a rotating motion.

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Both are true statements. A gram-positive bacterium is stained purple by the gram stain. Bacterial flagella propel the cell by using a rotating motion.

Multiple choice

Which of the following sets represent fruiting myxobacteria only?

  1. Cystobacter, Melittangium, Polyangium

  2. Cytophyga, Flexibacter, Sporocytophaga

  3. Flexibacter, Melittangium, Sporocytophaga

  4. Cytophyga, Cystobacter, Polyangium

  5. Cystobacter, Flexibacter, Sporocytophaga
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cystobacter, Melittangium, Polyangium: All are fruiting myxobacteria.

Multiple choice

Which one of the following is NOT a protoplast fusion inducing agent?

  1. Inactivated Sendai virus

  2. Ca2+ at alkaline pH

  3. Polyethylene glycol

  4. Colchicine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Colchicine is a microtubule-disrupting alkaloid used for chromosome doubling in plants, not for protoplast fusion. The other three options are well-established fusogenic agents: inactivated Sendai virus (A) mediates membrane fusion, polyethylene glycol (C) induces fusion by membrane dehydration, and Ca2+ at alkaline pH (B) promotes membrane aggregation and fusion. Colchicine's mechanism involves binding tubulin and inhibiting microtubule polymerization.

Multiple choice

Find the odd one out.

  1. L-form

  2. Protoplast

  3. Spheroplast

  4. Eubacteria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Eubacteria is a bacterium of a large group that typically has simple cells with rigid cell walls and flagella for movement.

Multiple choice

What is meant by PPLOs?

  1. Pleuropneumonia-life organisms

  2. Pleuropneumonia-like organisms

  3. Pleuroplasmic lysogenic organisms

  4. Pleuropneumonia L-form organisms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct Answer: Pleuropneumonia-like organisms

Multiple choice

Which of the following statements about L-forms is incorrect?

  1. L-forms are laboratory strains of bacteria that lack cell walls.

  2. L-form cells are spheres or spheroids.

  3. L-forms stain gram-positive.

  4. Cell division in L-forms is disorganised.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a gram stain test, L-forms always colour gram-negative due to the lack of a cell wall.

Multiple choice

Which of the following statements is/are incorrect?

  1. Red colour of members of rhodophyceae is due to presence of phycocyanin.
  2. In red algae, food is stored in the form of Floridian starch.
  3. In pheophyceae, flagella are inserted laterally.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because red colour of members of rhodophyceae is due to presence of phycoerythrin, while phycocyanin is a pigment found in blue-green algae.