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

Which of the following is not a characteristic of nonchordates?

  1. Notochord is absent in them.

  2. The central nervous system of nonchordates is hollow and dorsal.

  3. Their circulatory system is of open or closed type.

  4. Pharyngeal gill slits are absent in them.

  5. Post-anal tail is not present in nonchordates.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option.

Multiple choice

Match the following:

 
a. Mastigophora 1. Pseudopodia are chief organelles of locomotion and food catching
b. Sarcodina 2. Lack locomotory organelles
c. Sporozoa 3. Locomotory organs are flagella

  1. a - 2, b - 1, c - 3

  2. a - 1, b - 3, c - 2

  3. a - 1, b - 2, c - 3

  4. a - 3, b - 2, c - 1

  5. a - 3, b - 1, c - 2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. Mastigophora have locomotory organs as flagella. Sarcodina lack locomotory organelles. In Sporozoa, pseudopodia are the chief organelles of locomotion and food catching. This is a wrong option. In Sporozoa, pseudopodia are the chief organelles of locomotion and food catching.

Multiple choice

Which of the following is not a characteristic of Reptalia?

  1. The skin is non-glandular, dry and keratinised.

  2. Horny scales are present over their body surface.

  3. Their digits do not possess claws.

  4. Their heart is usually three-chambered.

  5. Fertilisation is internal.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option.

Multiple choice

Which of the following is a characteristic of Mammalia?

  1. Forelimbs are modified into wings.

  2. The body is covered with feathers and scales.

  3. Skin bears a number of sweat and oil glands.

  4. Mammary glands are absent.

  5. Bones of mammals are hollow or pneumatic.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option.

Multiple choice

Which of the following organisms are the diatoms?

  1. Unicellular algae

  2. Protozoan

  3. Free floating bryophytes

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

Diatoms are unicellular algae that belong to the group of photosynthetic phytoplankton. They are characterized by their unique silica-based cell walls called frustules, which are often intricately patterned. Diatoms are not protozoans, bryophytes, or detritivores - they are primary producers in aquatic ecosystems.

Multiple choice

Nostoc is characterized in having

  1. sexual reproduction

  2. uniflagellated zoospores

  3. cellulose cell wall

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

The cell wall of Nostoc is made up of cellulose and mucopolymer.

Multiple choice

Which of the following algae is a source of iodine?

  1. Polysiphonia

  2. Nostoc

  3. Laminaria

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

Laminaria (a brown alga/kelp) is a rich commercial source of iodine. Kelp has been historically harvested for iodine extraction. Polysiphonia is a red alga, Nostoc is a blue-green alga, and Volvox is a green colonial alga - none are major iodine sources.

Multiple choice

A true nucleus is absent in:

  1. green algae

  2. fungi

  3. lichens

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

Bacteria are prokaryotes lacking a true membrane-bound nucleus - their DNA exists as a circular chromosome free in the cytoplasm without nuclear envelope. Green algae, fungi, and lichens (symbiosis of fungi and algae) are all eukaryotes with true nuclei.

Multiple choice

Both bacterial and yeast cells are similar in features, except that:

  1. they are unicellular

  2. they are prokaryotic cells

  3. they bring about fermentation

  4. they are microscopic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yeast cells are eukaryotic with a defined nucleus and membrane-bound organelles, while bacterial cells are prokaryotic lacking a true nucleus and organelles. Both share characteristics like being unicellular, microscopic, and capable of fermentation, making cellular organization the key difference.

Multiple choice

Which of the following statements is correct?

  1. Male frog has anus while female frog has cloacal aperture.

  2. Female frog has anus while the male frog has cloacal aperture.

  3. Both male and female frogs have anus.

  4. Both male and female frogs have cloacal aperture.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frogs possess a cloaca - a common chamber receiving fecal matter, urine, and reproductive products. Both sexes have this single opening, not separate anal and urogenital apertures like some other vertebrates.

Multiple choice

The scientific name of the common bath sponge is:

  1. Leucosolenia

  2. Euspongia

  3. Sycon

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

Euspongia is the genus of sponges that includes the common commercial bath sponge. These sponges have the soft, highly absorbent skeleton structure that makes them suitable for bathing. Spongilla is a freshwater sponge, Sycon is a calcareous sponge, and Leucosolenia is a simple colonial sponge - none are traditionally used as bath sponges.

Multiple choice

Living organisms are not capable of

  1. locomotion

  2. crystallisation

  3. respiration

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Living organisms perform biological processes like locomotion and respiration, but crystallisation is a physical process where atoms arrange into ordered solid structures. This occurs in inorganic materials like salt or minerals, not as a biological function.