Biology ยท 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

Which of the following organisms contain superoxide dismutase but do not contain catalase?

  1. Strict aerobic microorganisms

  2. Facultative anaerobic microorganisms

  3. Microaerophile microorganisms

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

Aerotolerant microorganisms contain superoxide dismutase but do not contain catalase. Catalase breaks toxic hydrogen peroxide to water and oxygen. These organisms can tolerate oxygen radicals due to superoxide dismutase but cannot use it for growth.

Multiple choice

Which of the following organisms has the ability to regenerate its lost body parts?

  1. Amoeba

  2. Planaria

  3. Paramecium

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

Planaria is famous for its remarkable regenerative abilities. If a planarian is cut into several pieces, each piece can regenerate into a complete organism. This is due to the presence of specialized stem cells called neoblasts that can differentiate into any cell type needed. Amoeba, Paramecium, and Euglena reproduce primarily by fission but do not have significant regenerative capabilities.

Multiple choice

Assertion: Mycoplasmas are the simplest and the smallest of all the free living prokaryotes. Reason: They are pleomorphic.

  1. A and R both are correct and R is correct explanation of A.

  2. A and R both are correct and R is not the correct explanation of A.

  3. A is correct and R is incorrect.

  4. A is incorrect and R is correct.

  5. A and R both are incorrect.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mycoplasmas or mollicutes are the simplest and smallest of all the free living prokaryotes. Due to the absence of a cell wall, these organisms can change their shape and are pleomorphic.

Multiple choice

Which of the following is a set of false worms?

  1. Round worm, Hook worm, Tape worm

  2. Earth worm, Round worm, Tape worm

  3. Hook worm, Silk worm, Earth worm

  4. Tape worm, Silk worm, Earth worm

  5. Round worm, Silk worm, Tape worm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tape worm (Taenia solium) is a false worm belonging to Phylum Platyhelmithes. Silk worm (Bombyx mori) is a false worm belonging to Phylum Arthropoda. Earth worm (Pheretima posthuma) is a false worm belonging to Phylum Annelida.

Multiple choice

Which among the following statements does not characterise lichens?

  1. Lichens come in many colours.

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

  3. A fungus is called a mycobiont.

  4. The fungal partner protects the alga.

  5. A lichen is a composite organism.
Reveal answer Fill a bubble to check yourself
D 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

The first free-living organism to have its genome completely sequenced was a red alga. Which of the following algae is that?

  1. C. merolae

  2. A. hypnoides

  3. Galaxaura

  4. Gelidiella

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

C. merolae is a club-shaped, unicellular red alga that lives in highly acidic environments and in warm conditions. C. merolae has a single chloroplast and a single mitochondrion, but lacks a vacuole and a cell wall. The organism's genome was the first full algal genome to be sequenced in 2004; its plastid was sequenced in 2000 and 2003, and its mitochondrion in 1998.

Multiple choice

In Asia, rhodophytes are important sources of food, such as nori. Which among the following statements does not characterise the division Rhodophyta?

  1. Red algae are some of the oldest eukaryotic organisms on the planet.

  2. Red algae contain phycobilins.

  3. Red algae do not have flagella at any stage of their life cycle.

  4. Red algae act as habitat and food for some organisms.

  5. Red algae are typically found in fresh running water.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

They are very abundant in tropical and warm waters, although many are found in cooler waters.Red algae are typically found in marine waters attached to rocks or other plants in the calmer, deeper waters beyond the tidal zone.

Multiple choice

A doctor told a couple that their son is suffering from dermatitis, which is a severe skin disease. Which of the following algae is associated with dermatitis?

  1. Anabaena

  2. Cylindrospermopsis

  3. Nodularia

  4. Microcystis aeruginosa

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

Oscillatoria is blue greenish in colour, usually free floating or entwined with other algae. It is widespread. There are approximately 150 known species of which 47 are known to occur in Australia. Some species causes contact irritation leading to severe dermatitis.

Multiple choice

Which among the following statements regarding the characteristics of dinoflagellates is incorrect?

  1. Many are thecate, having an internal skeleton of cellulose-like plates.

  2. Their chromosomes are always condensed.

  3. They are small.

  4. Dinoflagellates usually reproduce sexually.

  5. They are planktonic.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The most form of reproduction is asexual, where daughter cells form by simple mitosis and division of the cell. The daughter cells will be genetically identical to that of the original cell. The thecal plates may either be divided, or completely shed and then reformed.