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 bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Which one of the following is incorrect for the members of chrysophyta?

  1. These are nonmotile bivalved organism

  2. Presence of primordial utricle around a central vacuole

  3. Resetve food materials are paramylon and volutin granules

  4. Movement occurs by mucilage propulsion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chrysophyta are motile. They sometime produce flagellated motile zoospores during reproduction. They are also bivalved.

Therefore the right answer is "These are nonmotile bivalved organism".

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Simple one-celled cyanobacteria-like organisms developed on earth.

  1. $5600$ million years
  2. $5000$ million years
  3. $4600$ million years
  4. $3600$ million years
  5. $3000$ million years
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fossil evidence and molecular clocks suggest that simple one-celled prokaryotic organisms, resembling modern cyanobacteria, first evolved on Earth approximately 3.5 to 3.6 billion (3500 to 3600 million) years ago. These early microbes played a crucial role in producing oxygen through photosynthesis, eventually altering Earth's atmosphere.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Which of the following statements is true?

  1. The structural unit of living things is molecule.

  2. All animals are autotrophs.

  3. All organisms reproduce sexually.

  4. Organisms follow a life cycle of birth, growth, reproduction, ageing and death.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • All the living organism is made up of cells which constitute some organic and inorganic molecules and perform all the life process like nutrition (autotrophic or heterotrophic), reproduction (sexual or asexual), excretion. 
  • Each cell arises from pre-existing cells, they divide and increase their numbers and has a certain life span, thus they undergo aging and then death. Thus, the correct answer is option D.
Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Each cell of unicelluler organism performs certain functions such as____________

  1. Nutrition

  2. Transport

  3. Excretion and reproduction

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • In unicellular (single-celled) organisms, the single cell performs all life processes for survival such as nutrition, transport, excretion, and reproduction. 
  • They do not depend on another cell for function and thus exist independently.
Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

An exception to cell theory is 

  1. Fungi

  2. Bryophyte

  3. Virus

  4. Pteridophyte
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Virus are an exception to cell theory. Because of the following reasons
1. The viruses are non-cellular organism that are characterized by having an inert crystalline structure outside the cell. 
2. Once they infect a cell they take over the machinery of the host cell to replicate themselves, killing the host.
So, the correct answer is 'Virus'.
Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Cell principle is not applicable to

  1. Bacteria.

  2. Viruses.

  3. Algae.

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

Cell principle states that the cell is a fundamental unit of life and has all structural and functional properties of an organism. Also according to this principle cells are made from pre-existing cells and all organisms are made up of cells. Bacteria, algae and fungi obey the cell principle rules whereas viruses are under debate of being living or dead. They have many features of life but according to cell theory, they are not alive. Viruses lack cellular structure (cell wall, cytoplasm, ribosomes etc.) but do have genetic material in the form of RNA and they can only multiply when inside a host cell. Outside a host, they are unable to survive. Since a virus is not a cell, cell principle is not applicable to them. 

Multiple choice botany taxonomy and systematic botany taxonomy and systematics systematics of living world kingdom plantae plant taxonomy classification of biodiversity

Animals cannot be classified using phylogenetic clues by taxonomists based on

  1. Body symmetry

  2. Motility

  3. Pattern of embryonic development

  4. Complexity of tissue organization

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Phylogenetic classification mainly depends on similarities and differences in their physical or genetic characteristics. The evolutionary relationship defined by the phylogenetic depends on the body symmetry, the pattern of embryonic development, the complexity of tissue organisation. Motility is a basic characteristic which is not prominent for a particular class rather it is common to all. It do not change with evolution.

So, the correct answer is option B.

Multiple choice biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

In amoeba, the digestion is intracellular because

  1. Amoeba is unicellular

  2. Amoeba is multicellular

  3. Amoeba is found in a pond

  4. Amoeba is a microscopic animal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Amoeba, a protozoan employs intracellular digestion for deriving nutrition. Food is ingested with the pseudopodium by invagination of cell membrane and subsequently stored into the food/gastric vacuole. This due to cytoplasmic movements combine with the lysosome where the food is broken down to simpler products and assimilated. Finally, the waste is removed by exocytosis by the contractile vacuole.

Multiple choice biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

Amoeba procures food through

  1. Proboscis

  2. Pseudopodia

  3. Cilia

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

Pseudopods which translates to "false feet" are temporary cytoplasm-filled parts of the cell wall that are able to change their form in order to move. They are used in some eukaryotic cells to move around or to eat. Most cells that do this are called as amoeboids. The amoeba is a common example. Proboscis, cilia and tongue are absent in amoeba. 

Therefore, the correct answer is option B.

Multiple choice biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

Pseudopodia are

  1. False feet developed in some unicellular organisms

  2. Small hairlike structures present on the unicellular organisms

  3. Long, tube like structure coming out of the mouth

  4. Suckers which are attached to the walls ofintestines
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pseudopods which translates to "false feet" are temporary cytoplasm-filled parts of the cell wall that are able to change their form in order to move. They are used in some eukaryotic cells to move around or to eat. Most cells that do this are called as amoeboids. The Amoeba is a common example. Proboscis, cilia and tongue are absent in Amoeba. 

Therefore, the correct answer is option A.

Multiple choice bio-chemistry taxonomy of angiosperms cell as structural and functional unit introduction to cell discovery and cell theory cell discovery

One of the following is an exception to the 'cell theory'. 

  1. Bacteria

  2. Fungi

  3. Virus

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

  • Schleiden and Schwann in 1839 formulated cell theory. 
  • There are several exceptions to cell theory, e.g., viruses do not have a cellular structure. 
  • They replicate but are non-living particles made up of proteins and nucleic acids. 
  • Only one nucleic acid is found in a virus particle either RNA or DNA.
Thus, the correct answer is option C.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Lichens are composites consisting of algae and

  1. Mosses

  2. Achlorophyllous organisms

  3. Bacteria

  4. Mycoplasma
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • A lichen is a composite organism that emerges from algae living among the filaments (hyphae) of the fungi in a mutually beneficial symbiotic relationship.
  • Fungi are Achlorophyllous organisms because they do not perform photosynthesis due to the absence of chlorophyll.
  • Hence Lichens are composites consisting of algae and achlorophyllous organisms(fungi).
  • So, the correct answer is 'Achlorophyllous organisms'.
Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Which statement about lichen is true?

  1. The fungus is protected by a network of algal filaments.

  2. Algal cells supply food to the fungal component.

  3. The algal component is parasitic on fungus.

  4. Lichens always need organic substratum for growth.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The photobiont supplies the association organic carbon from photosynthesis, and the mycobiont ensures protection and regulates the supply of minerals and water. The nutritional exchange between partners is probably much more complex than exchange of water and minerals for organic carbon.

Thus, the correct answer is option B.