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

Santalum is a/an

  1. symbiont

  2. total parasite

  3. obligate parasite

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

Santalum (sandalwood) is a partial (hemiparasitic) parasite. It photosynthesizes and produces its own organic compounds but obtains water and mineral nutrients from host plant roots through specialized organs called haustoria. This distinguishes it from total parasites that cannot photosynthesize.

Multiple choice

The breakdown of enzyme resistant cellulose in sheep, is done by

  1. aerobic bacteria

  2. protozoa

  3. Both (1) and (2)

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

Protozoa in the rumen produce cellulase enzymes that break down enzyme-resistant cellulose in sheep. While bacteria also contribute to fermentation, protozoa are particularly important for cellulose digestion. This is an anaerobic process, not requiring aerobic bacteria which cannot survive in the rumen environment.

Multiple choice

Dolphins have

  1. homodont and indefinite teeth

  2. hetrodont and definite teeth

  3. homodont and definite teeth

  4. hetrodont and indefinite 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 polyphyodont/indeterminate replacement (continuous tooth replacement throughout life). 'Heterodont' refers to having different tooth types like incisors, canines, and molars, which dolphins do not have. 'Definite' teeth would mean a fixed number, which is not true for dolphins.

Multiple choice

Which of the following statements are false?

P. Tapeworm has no digestive system because it absorbs food from general body surface. Q. The exoskeleton of insect is made up of lignin. R. Skull of a bird is dicondylic. S. Echinoderm adults show radial symmetry.

  1. P and Q

  2. P and S

  3. Q and R

  4. Q and S

  5. R and S
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Correct answer. Both the statements are false. The exoskeleton of insect is made up of chitin. Skull of a bird is monocondylic.

Multiple choice

The most important characteristic of a living organism is

  1. locomotion

  2. reproduction

  3. growth

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

 The most important characteristic of a living organism is reproduction. Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction.

Multiple choice

Snakes mainly respond to

  1. earth-borne sound vibrations through the quadrate bone

  2. air-borne sound vibrations through the quadrate bone

  3. earth-borne sound vibrations through squamosal bone

  4. Both (A) and (B)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Snakes mainly respond to earth-borne sound vibrations through the quadrate, although they are also sensitive to low frequency air-borne sound vibrations.

Multiple choice

Which of the following is not the basic feature that groups all organisms into a hierarchical classification?

  1. Nature of the cell, i.e. consisting of a clearly demarcated nucleus or not

  2. Unicellular or multi-cellular organism showing division of labour

  3. Habitat of the organism

  4. Whether the organism (plant) is an autotroph or not

  5. Whether the animal has specialised organs for different functions
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is not a basic feature that is considered while classifying all organisms into a hierarchical classification. Many organisms may not have any similarities except common habitat. Thus, this is the correct answer choice.

Multiple choice

Which of the following is not a characteristic of Kingdom Monera?

  1. The organisms do not have a clearly defined nucleus.

  2. Cell organelles are not covered with a membrane.

  3. These are unicellular organisms.

  4. None of these organisms have a cell wall.

  5. Mode of nutrition can be autotrophic or hetrotrophic.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Some organisms in Kingdom Monera have a cell wall and some do not have a cell wall. Thus, this is the correct answer.

Multiple choice

Which of the following is/are not true about Kingdom Protista?

a. Organisms under Kingdom Protista are unicellular eukaryotic organisms. b. Some of the organisms under Kingdom Protista use cilis or whip like flagella for moving around. c. The mode of nutrition for organisms under Kingdom Protista can be heterotrophic or autotrophic.

  1. Only a

  2. Only b

  3. Only c

  4. All of these

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer, as all statements are correct about Kingdom Protista.