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 one of the following is a motile unicellular organism with a single cilium and can exist as an autotrophy, as well as a saprotroph?

  1. Chlamydomonas

  2. Euglena

  3. Nostoc

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

Euglena is a unique unicellular organism that exhibits both plant-like and animal-like characteristics. It contains chloroplasts for photosynthesis (autotrophy) in the presence of light but can also absorb nutrients from its environment (saprotrophy) in the dark. It moves using a long, whip-like flagellum (referred to here as a cilium).

Multiple choice

Which of the following do not belong to phylum Chordata?

  1. Mammals

  2. Birds

  3. Snails

  4. Sea squirts

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

Yes, it is correct. Snails do not belong to phylum Chordata. Snail belongs to Mollusca. Molluscs have soft bodies that consist of three basic parts: a foot, a visceral mass and a mantle.

Multiple choice

Directions: In the question below, the 1st and the last (correctly ordered) sentences are numbered 1 and 6. The rest of the passage is split into four parts and named P, Q, R and S. These four parts are not given in the proper order. Chose the correct combination among the four alternatives given.

  1. Chilean flamingo eggs are incubated in the nest for around 30 days before hatching. P. At three days old, the chicks are visible and start to stand on both legs before leaving the nest at around two weeks old. Q. Their beaks are straight when they are born and help them break out the shell and make it easy to feed from their parents. R. The beaks start to bend as they begin to learn how to eat independently. S. The chicks will stay fluffily until around two months old when the feathers will grow in.
  2. They will now be able to fly and it’s also around this time when the chicks will be sexed.

  1. PQRS

  2. PSRQ

  3. QSRP

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

( P) The ‘three days old’ logically follows the time after hatching. (R) logically follows (Q) as the pronoun ‘they’ refer to the beaks and gives more information about the beaks. (S) connects to 6 as it refers to feathers which is followed by the statement that they will now be able to fly (after the feathers grow in).

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.