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 organism does not represent the phylum Porifera?

  1. Herdemania

  2. Sycon

  3. Euplectella

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

Porifera (sponges) includes organisms like Sycon, Euplectella, and Spongilla. Herdemania is actually a tunicate (protochordate), not a sponge. The question asks which does NOT represent Porifera, so the tunicate is the correct answer.

Multiple choice

Which organism represents the phyla, whose members lack mouth and anus?

  1. Spongilla

  2. Hydra

  3. Planaria

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

Phylum Porifera (sponges) are the only animals that lack both a mouth and an anus. They feed through specialized cells called choanocytes that capture food particles from water flowing through their pores. Spongilla is a freshwater sponge.

Multiple choice

Animals with jointed appendages belong to phylum

  1. Platyhelminthes

  2. Nematoda

  3. Annelida

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

Arthropoda literally means 'jointed feet' in Greek. This phylum is defined by jointed appendages, segmented bodies, and exoskeletons. It includes insects, arachnids, crustaceans, and myriapods.

Multiple choice

The most highly evolved organisms belong to the class

  1. Reptilia

  2. Amphibia

  3. Pisces

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

Mammals are considered the most recently evolved and complex vertebrate class. They possess advanced neural development, endothermy, complex social structures, and diverse adaptations. While all classes are evolved for their niches, mammals show the highest degree of encephalization.

Multiple choice

Which of the following is not a protochordate?

  1. Herdemania

  2. Balanoglossus

  3. Salamander

  4. Amphioxus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Protochordates include hemichordates (Balanoglossus), urochordates/tunicates (Herdemania), and cephalochordates (Amphioxus). These lack a true vertebral column. Salamander is an amphibian with fully developed vertebrae, making it a vertebrate, not a protochordate.

Multiple choice

Which of the following is a multicellular organism?

  1. Amoeba

  2. Yeast

  3. Human body

  4. Archaebacteria

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

This is the correct option. The human body is a multicellular organism as it is composed of more than 200 different kinds of cells.

Multiple choice

Which of the following statements is/are false?

a. Except the protozoan Euglena, no animal cell possesses plastids. b. Cell wall is absent in an animal cell. c. Animal cells have many simpler units of Golgi apparatus called dictyosomes.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

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

This is the correct option as this statement is false. Animal cells have a single highly complex and prominent Golgi apparatus.

Multiple choice

Which of the following is incorrect about bacteria?

  1. They are prokaryotes and lack nucleus and other cell organelles.

  2. They have prokaryotic ribosomes (70S) type.

  3. They are mostly unicellular but may be in the form of colonies of independent cells.

  4. Each bacterial cell contains a pair of chromosomes.

  5. Their mode of nutrition is simply absorptive.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Each bacterial cell contains a single chromosome, which is not enclosed in a nuclear membrane.

Multiple choice

Which of the following is not correct about fungi?

  1. Cell wall is made up of chitin.

  2. Nucleus encloses DNA material.

  3. They are multicellular organisms.

  4. They are aerobic organisms.

  5. They form endospore to overcome unfavourable conditions.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Endospore formation takes place in bacteria.