Biology · Science General

Diversity in Living Organisms

3,323 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 is a characteristic of bony fishes?

  1. Bony fishes contain 5 - 7 pairs of gill slits.

  2. Their mouth is ventral in position.

  3. They have a bony endoskeleton.

  4. Fishes are covered with Placoid scales.

  5. An operculum is absent in them.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as bony fishes do have a bony endoskeleton.

Multiple choice

Which of the following is a characteristic of animals of class Aves?

  1. Forelimbs are modified into wings.

  2. Feathers and scales are absent.

  3. Skin bears a number of sweat and oil glands.

  4. Females have mammary glands for feeding the young.

  5. Bones are not hollow or pneumatic.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option as this is a characteristic of animals of class Aves.

Multiple choice

Which of the following is not a characteristic of Amphibia?

  1. The skin of Amphibia is glandular, smooth and moist.

  2. Horny scales are present over their body surface.

  3. Their digits do not possess claws.

  4. Amphibia's heart is a three-chambered heart.

  5. Fertilization is external.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option as this is not a characteristics of Amphibia. Scales are not present in Amphibians.

Multiple choice

Which of the following is not a characteristic of phylum Porifera?

  1. They have a cellular level of organisation.

  2. Digestion is intracellular.

  3. Muscles and nerve cells are absent.

  4. Appendages are present in poriferans in the form of tentacles.

  5. Poriferans contain the special cells called collar cells or choanocytes.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option as appendages are absent in poriferans.

Multiple choice

Match the following:

a. Acoelomates 1. They have a true body cavity or coelom which originates from the mesoderm and is lined by epithelial cells of mesodermal origin.
b. Pseudocoelomates 2. They do not have a body cavity, because the space between the body wall and digestive tract is filled with parenchymatous tisue.
c. Coelomates 3. They have a cavity between the body wall and digestive tract, but this cavity does not arise from the mesoderm and is not lined by epithelial cells.

  1. a - 2, b - 1, c - 3

  2. a - 3, b - 2, c - 1

  3. a - 2, b - 3, c - 1

  4. a - 1, b - 3, c - 2

  5. a - 1, b - 2, c - 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option. Acoelomates do not have a body cavity, because the space between the body wall and digestive tract is filled with parenchymatous tisue. Pseudocoelomates have a cavity between the body wall and digestive tract, but this cavity does not arise from the mesoderm and is not lined by epithelial cells. Coelomates have a true body cavity or coelom which originates from the mesoderm and is lined by epithelial cells of mesodermal origin.

Multiple choice

Match the following:

a. Kingdom Monera 1. Unicellular eukaryotic organisms
b. Kingdom Protista 2. Eukaryotic multicellular organisms
c. Kingdom Fungi 3. Prokaryotic bacteria and blue-green algae

  1. a - 3, b - 1, c - 2

  2. a - 3, b - 2, c - 1

  3. a - 1, b - 2, c - 3

  4. a - 1, b - 3, c - 2

  5. a - 2, b - 1, c - 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Kingdom Monera consists of prokaryotic bacteria and blue-green algae. Kingdom Protista consists of unicellular eukaryotic organisms. Kingdom Fungi consists of eukaryotic multicellular organisms.

Multiple choice

In Whittaker's system of classification, prokaryotes are placed in the kingdom

  1. Protista

  2. Monera

  3. Plantae

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

In Whittaker's five-kingdom classification system (1969), Monera is the kingdom for prokaryotic organisms, bacteria and archaebacteria, whose cells lack a nucleus. The other kingdoms (Protista, Fungi, Plantae, Animalia) all contain eukaryotes with nucleated cells.

Multiple choice

Sea mouse belongs to phylum

  1. mollusca

  2. cnidaria

  3. arthropoda

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

The sea mouse (Aphrodita) is a marine worm that belongs to phylum Annelida, segmented worms. Despite its name and appearance, it's not related to mollusks, cnidarians, or arthropods. Annelids are characterized by segmented bodies and bristle-like structures.

Multiple choice

The highest degree of polymorphism is found in

  1. protozoa

  2. cnidaria

  3. platyhelminthes

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

A striking feature of cnidarians is the high degree of polymorphism often seen in a single species. Two basic types—sessile polyp and free-swimming medusa-occur.

Multiple choice

Tympanic bone forms large bulla in _______.

  1. humans

  2. australopethicus

  3. Both 1 and 2

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

The tympanic bulla (a bony enclosure of the middle ear) is notably large in lemurs and other prosimians compared to humans and australopithecines. This is an anatomical feature used in primate classification and comparative anatomy.

Multiple choice

Patagium is an organ in flying mammals which is synonym to _______.

  1. hands of man

  2. wings of insects

  3. feathers of birds

  4. fins of fishes

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The patagium in bats is the wing membrane formed by modified skin stretching between the elongated digits (fingers) of the forelimbs, along the body sides to the hindlimbs. This makes it analogous to the hand structure in humans, not insect wings or feathers.

Multiple choice

Dolphins have ________.

  1. homodont and indefinite teeth

  2. heterodont and indefinite teeth

  3. homodont and definite teeth

  4. heterodont and definite teeth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dolphins have homodont dentition (all teeth are similar in shape, conical for catching fish) and their teeth are continuously replaced throughout life (indefinite/polyphyodont). They don't have the differentiated tooth types (heterodont) seen in most mammals.