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 combinations of phylum and description is incorrect?

  1. Echinodermata – bilaterial and radial symmetry, coelom from archenteron

  2. Nematode – roundworms, pseudocoelomate

  3. Cnidaria – radial symmetry, polyp and medusa body forms

  4. Porifera – gastrovascular cavity, coelomate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Option D is incorrect because Porifera (sponges) do NOT have a gastrovascular cavity - they have a unique water canal system with ostia, spongocoel, and osculum for filter feeding. Also, sponges are NOT coelomate - they have no true body cavity. The other options are correct: Echinoderms have bilateral larval and radial adult symmetry, Nematodes are roundworms with pseudocoelom, Cnidarians have radial symmetry with polyp/medusa forms.

Multiple choice

Where do terrestial animals live?

  1. They live in water.

  2. They live on land.

  3. They live in air.

  4. They live on trees.

  5. They live both on land and in water.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The animals that live on land are called terrestrial animals.

Multiple choice

Which of the following statements is incorrect about birds?

  1. Birds are ariel animals.

  2. Their front limbs are modified as wings.

  3. They move their wings up and down and push themselves through the air.

  4. They use their legs and claws to sit on a tree and hop on the ground.

  5. The bones of birds are solid and heavy which help them to fly high with ease.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The bones of birds are hollow and are light. This characteristic of their body helps them to fly high in the air.          

Multiple choice

Plasma membrane of prokaryotes is less rigid because it is devoid of

  1. membrane proteins

  2. sterols like cholesterol

  3. phospholipids

  4. lipids

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

The plasma membrane of a bacterial cell is less rigid as it is devoid of sterols like cholesterol. One exception to this is the prokaryote mycoplasma that contains sterols in the plasma membrane. In the absence of cell wall, sterol containing plasma membrane offers strength and rigidity to this prokaryote.

Multiple choice

Which of the following statements is true for the prokaryotes?

  1. Prokaryotes lack peptidoglycan in their cell wall.

  2. Prokaryotes lack plasma membranes.

  3. Prokaryotes lack histones proteins.

  4. Prokaryotes lack ribosomes.

  5. Prokaryotes lack photosynthesis.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Histone proteins are associated with the DNA of eukaryotes, but not with the DNA of prokaryotes as they lack histone proteins.

Multiple choice

What does Archezoa hypothesis indicate?

  1. Difference between eubacteria and archaebacteria

  2. Eukaryotic endosymbiosis

  3. Chlorophyll c presence in Chromists

  4. Presence of domain archea
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Archezoa hypothesis proves eukaryotic endosymbiosis, i.e kingdom Diplomadida and kingdom Parabasala originally had mitochondria, but lost them before mitochondria became symbionts of protists.