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

In elephants, the tusks are

  1. incisors

  2. molars

  3. canines

  4. enlarged cartilaginous bones
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Elephant tusks are actually elongated second upper incisor teeth.

Multiple choice

______ are formed by a symbiotic relationship between algae and fungi.

  1. Saprophytes

  2. Parasites

  3. Lichens

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

Lichens are composite organisms resulting from a symbiotic relationship between a fungus and a photosynthetic partner, usually an alga. The fungus provides a protected environment and minerals, while the alga provides food through photosynthesis. This mutualism allows them to survive in harsh environments.

Multiple choice

Aves are ______ blooded animals.

  1. warm

  2. cold

  3. Both (1) and (2)

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

Warm-blooded animal species can maintain a body temperature higher than their environment. In particular, homeothermic species maintain a stable body temperature by regulating metabolic processes. The only known homeotherms are mammals and birds.

Multiple choice

Which of the following phyla has true body cavity?

  1. Porifera

  2. Coelenterata

  3. Nematoda

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

Reason: Coelom is a true internal body cavity between body wall and digestive tract of many animals in which well-developed organs can be accommodated. 

Multiple choice

Which of the following organisms represents the phylum 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

Spongilla belongs to the group porifera. They are commonly known as sponges. The word ‘porifera’ means organisms with holes. These are non-motile animals attached to some solid support under water. They have holes or ‘pores’ all over the body. These lead to a canal system, which helps in circulating water throughout the body to bring in food and oxygen. The members of this phylum lack mouth and anus. 

Multiple choice

Which of the following is not a feature of vertebrates?

  1. Presence of notochord.

  2. Presence of gill slits or lungs for respiration.

  3. Presence of water vascular system.

  4. Presence of bilaterally symmetrical body.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  Presence of water vascular system is not a feature of vertebrates.

Multiple choice

In which of the following phyla is notochord present?

  1. Mollusca

  2. Vertebrata

  3. Annelida

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

A flexible rod-like structure that is present in the embryos of all chordates and in the adult forms of certain groups, such as the lancelets and hagfishes. The notochord develops into the spinal column in most vertebrates.

Multiple choice

Agar-agar is obtained from

  1. gelidium

  2. volvox

  3. chara

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

Agar-agar is a gelatinous substance obtained from the cell walls of certain species of red algae, specifically from the genus Gelidium.