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

Radial symmetry is seen in

  1. mollusca

  2. protozoa

  3. starfish

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

Body symmetry is the similarly of parts in different regions and directions of the body. In radical symmetry a number of similar parts radiate out form a central axis. The body of the individual can be divided into equal halves by any plane passing through the centre from top to bottom. Ex. Some sponges (Sycon) f coelenterates (hydra, jelly fish) echinoderms (e.g., starfish). 

Multiple choice

Echinodermata is a group of animals which are :

  1. coelomate, horny, marine.

  2. coelomate, spiny, marine

  3. acoelomate, spiny, fresh water

  4. joint legged, marine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Echinodermates are totally marine, triploblastic, unsegmented and coelomate. Coelom is enterocoel. Larval stage is bilateral and adult is radial in symmetry. In echinodermates short and stout spines are present on the aboral surface which are blunt, immovable and calcareous. 

Multiple choice

Which of the following is not a case of epimorphoisis?

  1. Formation of sperms from small clumps of cells

  2. Regeneration of tail in a lizard

  3. Replacement of severed arm in starfish

  4. Replacement of limb in salamander
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Epimorphosis is a form of development in segmented animals in which body segmentation  is completed before hatching. Formation of sperms for small clumps of cells can not be a case of epimorphosis. 

Multiple choice

Which of the following symmetry is found in adult sea-anemone?

  1. Radial

  2. Biradial

  3. Bilateral

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

Sea anemone (Metridium) is a cylindrical and radially symmetrical animal which measures 5-7 cm. in length. It is usually brownish or yellowish in colour. Body of sea anemone is divided into oral disc, peadal disc and column. 

Multiple choice

Body cavity of adult Ascaris is :

  1. haemocoel

  2. amphicoel

  3. pseudocoel

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

Body cavity of ascaris is called pseudocoel. It is the space between body wall and the alimentary canal which is not lined by mesoderm. 

Multiple choice

Entamoeba histolytica differs from Amoeba proteus in not having the

  1. pseudopodia

  2. contractile vacuole

  3. ectoplasm

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

Entamoeba histolytica differ from Amoeba proteus due to absence of contractile vacuole. It is monogenetic, dimorphic and parasitic protozoan found in intestine and causes amoebic dysentery or amoebiasis. 

Multiple choice

Coelentrates differ from other animals in having :

  1. nematocysts

  2. polymorphism

  3. blateral symmetry

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

Nematocysts are the characteristic feature of phylum Coelenterate. These are sac like organelles located at the centre of cnidocyte. Cnidocytes or stringing cells occur in entire epidermis except that of basal disc. The free end of each cnidocyte at epidermal surface bears a small and stiff conical spine-like projection called cnidocil or trigger. 

Multiple choice

Being mammals, whale, dolphin, bat, monkey and horse have some common characters but they also show conspicuous differences. This is due to the phenomenon of

  1. normalisation

  2. genetic drift

  3. divergence

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

Development of different functional structures from a common ancestral form is called adaptive radiation or divergent evolution. 1.      Varied limb structures of mammals 2.      Darwin's finches of Galapagos island 3.         Australian marsupials

Multiple choice

All chordates at one or the other stage have :

  1. pharyngeal gill-slits

  2. vertebral column

  3. two pairs of pentadactyle limb

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

General characters of chordates are: (1)        Presence of pharyngeal gill slits at any stage of life. (2)        Presence of notochord at any stage of life.  (3)        Presence of dorsal tubular nerve cord.

Multiple choice

Which of the following conditions is necessary for living things?

  1. Movement by themselves

  2. Need food, air and water

  3. Respiration

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Living things generally exhibit characteristics such as movement, respiration, and the need for nutrients (food, air, water). Since all listed options are standard biological characteristics, the correct choice is all of the above.