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 types of symmetry is found in adult sea anemone?

  1. Radial

  2. Symmetrical

  3. Biradial

  4. Bilateral

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Radial symmetry is especially suitable for sessile animals, such as the sea anemone. It is the symmetrical arrangement of parts of an organism around a single main axis so that the organism can be divided into similar halves by any plane that contains the main axis.

Multiple choice

Elephants have which of the following types of hearts?

  1. Myogenic

  2. Neurogenic

  3. Both 1 and 2

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A myogenic heart contracts by itself without any external stimulus, while a neurogenic heart contracts after receiving an external stimulus in the form of a nerve impulse. Elephants and all other mammals have myogenic hearts.

Multiple choice

Pseudocoelom is the characteristic of which of the following?

  1. Annelida

  2. Mollusca

  3. Echinodermata

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

The pseudocoelom is a fluid-filled body cavity that lies inside the external body wall of the nematode that bathes all the internal organs, including the alimentary system and the reproductive system.

Multiple choice

Hydra has which of the following?

  1. One testis and one ovary

  2. One testis and many ovaries

  3. Many testes and many ovaries

  4. Many testes and one ovary
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Usually, several testes develop on the anterior half of the column and usually one ovary develops on the posterior half of the column.

Multiple choice

Larva of Sycon is

  1. parenchymula

  2. amphiblastula

  3. redia

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

Amphiblastula larva is the larva of Sycon, which is a poriferan.

Multiple choice

Choanocyte is the characteristic feature of

  1. sponges

  2. arthropods

  3. annelida

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

These are flagellated cells with a collar of protoplasm at the base of the flagellum, number of which line the internal chambers of sponges.

Multiple choice

Bacteria do not have

  1. ribosomes

  2. protein synthesising apparatus

  3. mitochondria

  4. cell wall

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

Bacteria, being prokaryotic, lack mitochondria.

Multiple choice

Amoeba is a/an

  1. unicellular animal

  2. octacellular animal

  3. multicellular animal

  4. All of the above

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Amoeba is a unicellular animal having one cell. It performs all the functions through it.

Multiple choice

Which of the following is the largest phylum in terms of number of species?

  1. Coelenterata

  2. Porifera

  3. Arthropoda

  4. Protozoa

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

Arthropoda is the largest phylum in the animal kingdom, which includes familiar forms as lobsters, crabs, spiders, mites, insects, centipedes and millipedes. About 84 percent of all known species of animals are members of this phylum.

Multiple choice

Natural pearl belongs to which of the following phylums?

  1. Arthropoda

  2. Mollusca

  3. Echinodermata

  4. Protozoa

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pinctada is a genus of saltwater clams (marine bivalve molluscs) in the family Pteriidae, the pearl oysters. These oysters have a strong inner shell layer that is composed of nacre, also known as mother of pearl.