Biology ยท 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 regarding the octopus is INCORRECT?

  1. Octopuses are characterised by suction cups.

  2. Reproduction is a cause of death in octopuses.

  3. Octopuses have a long life expectancy.

  4. Octopuses have three hearts.

  5. An octopus has a highly complex nervous system.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Octopuses have a relatively short life expectancy and some species live for as little as six months.

Multiple choice

Which of the following statements regarding the cephalopods is INCORRECT?

  1. Cephalopod vision is acute.

  2. Cephalopods are the only mollusks with a open circulatory system.

  3. Most cephalopods possess chromatophores.

  4. Cephalopods can change their colours.

  5. Most cephalopods can move by jet propulsion.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cephalopods are the only mollusks with a closed circulatory system. Coleoids have two gill hearts (also known as branchial hearts) that move blood through the capillaries of the gills. A single systemic heart then pumps the oxygenated blood through the rest of the body.

Multiple choice

Pinctada is a genus of saltwater clams. Which of the following members of Pinctada is the only known species that produces the South Sea pearls?

  1. P. radiata

  2. P. margaritifera

  3. P. maxima

  4. P. mazatlanica

  5. P. albina
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pinctada maxima is the only species that produces South Sea pearls. Currently south sea pearls are cultured primarily in Australia and Tahiti. Because these pearl oysters are so large, a much larger nucleus than usual can be used in culturing.

Multiple choice

Which of the following is the genus of pen shells?

  1. Mya

  2. Octopus

  3. Vema

  4. Solen

  5. Pinna
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Pinna is a genus of pen shells. It is a cosmopolitan genus of bivalve molluscs characterised by elongated and wedge-shaped shells, which most commonly stand point-first in the sea bottom in which they live, anchored by a net of byssus threads.

Multiple choice

Nematodes are _________.

  1. pseudocoelomate

  2. coelomate

  3. acoleomate

  4. haemocoelomate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nematodes have a pseudocoelom, which is a body cavity not completely lined by mesoderm. This distinguishes them from true coelomates where the cavity is fully lined by mesoderm on both sides.

Multiple choice

Platyhelminthes are __________.

  1. coelomates

  2. acoelomates

  3. pseudocoelomates

  4. haemocoelomates
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Platyhelminthes (flatworms) are acoelomates, meaning they lack a body cavity between the digestive tract and the outer body wall.

Multiple choice

Which feature is common between birds and crocodiles?

  1. Presence of four chambered heart

  2. Presence of hair

  3. Presence of oil glands

  4. Presence of beak
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Both birds and crocodiles have a four-chambered heart. This is an example of convergent evolution or shared ancestral traits in archosaurs.