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

Presence of notochord, dorsal tubular nerve cord and pharyngeal slits are the three important characters of phylum Chordata. In which of the following chordates are all the three characters present in the adult form?

  1. Doliolum

  2. Oikopleura

  3. Branchiostoma

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

 Presence of notochord, dorsal tubular nerve cord and pharyngeal slits are the three important characters of phylum Chordata. In Branchiostoma, all the three characters are present in the adult form.

Multiple choice

Which of the following statements regarding mammals is correct?

A. Mammals have double occipital in their skull

B. Left aortic arch is seen in mammals

C. Order cetacea includes some aquatic mammals

  1. A and B

  2. B and C

  3. A, B and C

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

Mammals are characterized by a double occipital condyle, the presence of a left aortic arch (the right is lost), and the order Cetacea includes aquatic mammals like whales and dolphins.

Multiple choice

Portuguese man-of-war is a

  1. Coelenterate

  2. Flatworm

  3. Mollusc

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

The Portuguese man-of-war (Physalia physalis) is a siphonophore, which is a colony of specialized zooids belonging to the phylum Coelenterata (Cnidaria).

Multiple choice

Neoteny occurs in

  1. Necturus

  2. Icthyophis

  3. Salamandra

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

Neoteny (or paedomorphosis) is the retention of larval features in the adult. It is well-documented in Necturus (mudpuppy), and often observed in other salamanders like Ambystoma (axolotl).

Multiple choice

In elephants, the tusks are

  1. incisors

  2. molars

  3. canines

  4. enlarged cartilaginous bones
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Elephant tusks are elongated, continuously growing teeth that are anatomically classified as incisors.

Multiple choice

Although films about the American West depict coyotes as solitary animals howling mournfully on the tops of distant hills, in reality these gregarious creatures live in stable groups that occupy the same territory for long periods.

  1. films about the American West depict coyotes as solitary animals howling mournfully on the tops of distant hills

  2. in films about the American West coyotes are depicted to be solitary animals that howl mournfully on the tops of distant hills

  3. coyotes are depicted as solitary animals howling mournfully on the tops of distant hills in films about the American West

  4. films about the American West depict coyotes as if they were solitary, mournfully howling animals on the tops of distant hills

  5. films about the American West depict coyotes to be solitary and mournfully howling animals on the tops of distant hills
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The underlined part is perfectly fine.

Multiple choice

Which of the following statements is/are incorrect?

a. Locomotion helps animals to escape from their enemies and predators. b. A skeletal system consists of bones present in the body from head to toe. c. Locomotion helps animals to find their partners for reproduction and move to favourable areas for laying eggs.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this statement is false.  

Multiple choice

The mode of nutrition in Protista is/are

  1. autotrophic

  2. heterotrophic

  3. parasitic

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

protist may have chlorophyll to prepare their own food, or may take up food from surroundings or even live as parasite on the host.

Multiple choice

Which of these modes of nutrition is absent in protists?

  1. Photosynthetic

  2. Chemosynthetic

  3. Parasitic

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

The members of this kingdom show a diverse mode of nutrition. They may be autotrophic or heterotrophic. Heterotrophic forms may be holozoic or parasitic or saprophytic or even mixotrophic (obtaining nourishment by more than one method), but not chemosynthetic.

Multiple choice

Which of the following protists have hypotheca & epitheca?

  1. Diatoms

  2. Dinoflagellates

  3. Euglenoids

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

 Epitheca: This term is used to refer to both the larger, older valve (epitheca) of the frustule as well as the girdle elements (epicingulum) that are connected with it. Hypotheca: This term is used to refer to the smaller, younger valve (hypotheca) of the frustule as well as the girdle elements (hypocingulum) that are connected with it. Diatoms have hypotheca & epitheca.