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 of the following statements is incorrect?

  1. Chlamydomonas is a unicellular alga.

  2. Volvox form cuboidal colonies up to 50,000 cells in number.

  3. Ulothrix and spirogyra are filamentous algae.

  4. Asexual reproduction in algae is carried out by the production of zoospores.

  5. Chlamydomonas is an anisogamous alga.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Volvox form spherical colonies up to 50,000 cells in number. The colonies live in fresh water habitat.

Multiple choice

Skin is an accessory organ of respiration in

  1. humans

  2. frog

  3. rabbit

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

Frogs use their moist, highly vascularized skin as an accessory respiratory organ for gas exchange (cutaneous respiration), supplementing their lungs. Humans, rabbits, and lizards do not have skin adapted for significant respiratory function - their skin is primarily protective.

Multiple choice

Which of the following statements does not characterise lichens?

  1. Lichens come in many colours.

  2. A lichen is made up of a simple photosynthesising organism.

  3. The fungus is called a mycobiont.

  4. A lichen is a composite organism.

  5. The fungal partner protects the algae.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The algal partner protects the fungal partner by retaining water, serving as a larger capture area for mineral nutrients and in some cases, provides minerals obtained from the substrate.

Multiple choice

Which of the following statements about bacterial flagella are false?

a. They operate at high Reynolds number. b. Sodium-ion pump driven flagella are found in vibrio. c. Flagella evolve from Type III secretory system. d. The S-ring of flagella directly attaches to plasma membrane. e. Campylobacter jejuni has 11 protofilaments. f. Fasciculi are seen in spirochetes. g. Archeal flagella grow by addition of subunits to the base.

  1. a, b and d

  2. e, f and g

  3. a, e and f

  4. e, b and c

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

a, e and f are false. Bacterial flagella operate at low Reynolds number. Campylobacter jejuni has 7 protofilaments. Fasciculi are seen in Selanomonas.

Multiple choice

Protozoa are _______ organisms.

  1. unicellular

  2. multicellular

  3. prokaryotic

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

Protozoa are single-celled eukaryotic organisms that belong to the kingdom Protista. They are not multicellular, not prokaryotic (bacteria), and are ecologically and medically important as pathogens, parasites, and decomposers. 'Unimportant' is factually incorrect.

Multiple choice

The two types of calyx are gamosepalous and ______.

  1. polysepalous

  2. persistent calyx

  3. petalloid

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

The two types of calyx based on sepals fusion are: gamosepalous (fused sepals, as in china rose) and polysepalous (free sepals, as in mustard). Persistent is a type based on duration, not fusion. Petalloid and sepalloid describe perianth, not calyx types.

Multiple choice

Amoeba ingests food by using

  1. vacuole

  2. cytoplasm

  3. endoplasm

  4. nucleus

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

Amoeba ingests food by using pseudopodia. This is the correct answer.

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

Patagium is an organ in flying mammals which is synonymous to

  1. flippers

  2. parachute

  3. wings

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

The patagium in flying mammals like bats functions as a parachute-like membrane that provides lift and drag during gliding and flight. Unlike wings (which have rigid structures) or flippers, the patagium is a flexible skin membrane that creates resistance against air, similar to parachute mechanics.