Biology · Science General

Diversity in Living Organisms

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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 biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Choose the correct answers from the alternatives given.
Which of the following live in habitats much like those of the early Earth?

  1. Protozoans

  2. Eubacteria

  3. Archaebacteria

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

The fossil shapes almost 3.5 billion years ago, identify them as archaea.

So, the correct option is 'Archaebacteria'.

Multiple choice biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Which of the following statements is true?

  1. True cell evolved before the protocell

  2. Prokaryotes evolved before eukaryotes

  3. Eukaryotes evolved before prokaryotes

  4. Prokaryotes didnt evolve until 1.5 billion years ago
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • Scientists have concluded that prokaryotic life forms preceded the more complex eukaryotes. 
  • All organisms on Earth are classified into two basic cell types. "Kary" means nucleus, "Pro" means "before," and prokaryotes have DNA in a freely floating ring that is not encased in a nucleus. 
  • "Eu" means "true," and eukaryotes have DNA arranged in chromosomes and encased in a nucleus. 
  • Fossil evidence indicates that prokaryotic cells first existed on the earth, prior to the arrival of the eukaryotes. 
  • Though they lack skeletons, a few groups of single-celled organisms have hard portions or secrete hard shells and so appear in the fossil record. 
  • This record is the best indication of prokaryotes' and eukaryotes' relative ages.
So the correct option is 'prokaryotes evolved before eukaryotes'.

Multiple choice biology habits and habitats of some important animals behavioural science ethology animal behaviour

Members of phylum __________ are diploblastic.

  1. Platyhelminths

  2. Cnidaria

  3. Annelida

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

Animals can be distinguished based in number of germ layers present. There are generally three germ layers viz. endoderm, mesoderm and ectoderm. Based on this animals are said as monoblasts, diploblasts and triploblasts. 

Multiple choice biology habits and habitats of some important animals behavioural science ethology animal behaviour

Identify the unusual behavioural pattern of animals.

  1. Bluffing

  2. Instinct

  3. Mimicry

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

Instinct and mimicry are the behaviours which are shown by the animals. Instinct is the ability to judge an event and give response accordingly. Mimicry is performed in order to protect them. Bluffing is an unusual behaviour which may be seen due to fear. This may be used as a form of communication for protection against the predator.

Thus, the correct answer is option A.  

Multiple choice biology habits and habitats of some important animals behavioural science ethology animal behaviour

The short and stout beak of a bird is an adaptation to

  1. Drink nectar from flowers

  2. Catch fish

  3. Pick up small insects

  4. Tear flesh from animals

  5. Crack seeds
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

A bird's beak can tell us what type of food it eats. Short stout cone shaped beak is an adaptation to help crack nuts and seeds. For example the sparrows and finches have this type of beaks to crack the nuts. The hawk also has short beak but their upper beak is a hook type to tear flesh.  

Multiple choice biology biodiversity and classification pathogen and their mode of transmission economic importance of bacteria and fungi five kingdoms of living organisms

Which of these kingdoms contains unicellular animals?

  1. Eubacteria

  2. Archaebacteria

  3. Fungi

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

The kingdom Protista includes diverse forms of predominantly water-dwelling, eukaryotic unicellular micro-organisms. Some of these organisms are animal-like(protozoan), others resemble plants (algal protists), and others demonstrate the characters of fungi. In kingdom Protista, all organism are unicellular during most phases of their life cycle or are colonial. Thus option D is the correct answer. 

Multiple choice biology biodiversity and classification pathogen and their mode of transmission economic importance of bacteria and fungi five kingdoms of living organisms biodiversity and need of classification biodiversity on earth and in india

Choose the correct answers from the alternatives given.
All unicellular organisms with a true nucleus were included in the kingdom

  1. Monera

  2. Protista

  3. Fungi

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

In the five-kingdom classification system, all unicellular eukaryotic organisms (those with a true nucleus) are placed in the kingdom Protista.

Multiple choice biology biodiversity and classification pathogen and their mode of transmission economic importance of bacteria and fungi five kingdoms of living organisms

An organism without membrane-bound organelles belongs to

  1. Monera

  2. Protista

  3. Fungi

  4. Plantae

  5. Animalia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Kingdom protists, Fungi, Plantae, and Animalia belong to domain eukarya and include only eukaryotic organisms. Kingdom monera includes unicellular prokaryotic organisms that lack a well-defined nucleus and other membrane-bound organelles.Thus, the correct answer is option A.

Multiple choice biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi five kingdoms of living organisms


Cells of many protistans, plants, and fungi, but not animals, commonly have

  1. cell wall

  2. ribosomes

  3. plasma membrane

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

(A) The cell wall is a structural layer around types of the cell outside the cell membrane which provides the cell with structural support and protection found in algae, fungi, plants, bacteria and archaea.

(B) Ribosomes are minute particles with associated proteins and RNA to synthesise proteins and it can be found floating in the cytoplasm or attached to the endoplasmic reticulum.
(C) Plasma membrane surrounds the cell wall, which is composed of a phospholipid bilayer arranged back to back and covered in cholesterol and protein molecule.
(D) Mitochondria are rod-shaped organelles, considered the power generators of the cell which converts nutrients and oxygen into ATP. They are not present in bacteria.
Hence, the correct answer is 'cell wall'

Multiple choice biology selection and evolution theory of natural selection natural selection evidence for evolution

The first organisms were

  1. Primitive eukaryotes

  2. Aerobic bacteria

  3. Prokaryotic chemoautotrophs

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

The first organisms that appeared on earth resembled single-celled life forms called archaea that can live in extreme environments such as hot springs and deep-sea vents. They were prokaryotic heterotrophs and used inorganic chemicals from the environment for carbon fixation and this process is called chemoautotrophy. They were anaerobic in nature because free oxygen was absent during primitive environment on earth.

Thus the correct answer is option C.