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

Sinus venous is absent in

  1. mammal

  2. reptile

  3. aves

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

Sinus venosus, a fetal heart structure that returns blood to the right atrium, is absent in mammals. In mammals, this function is taken over by the superior and inferior vena cava. It persists in other vertebrates like fish, reptiles, and birds.

Multiple choice

Bacteria are

  1. prokaryotes

  2. eukaryotes

  3. non-cellular

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

Bacteria are prokaryotic organisms, meaning they lack a membrane-bound nucleus and other membrane-bound organelles. Their DNA floats freely in the nucleoid region. Eukaryotes (plants, animals, fungi) have membrane-bound nuclei, while bacteria are single-celled prokaryotes that reproduce by binary fission.

Multiple choice

In which of the following living organisms is skin a necessary organ for respiration?

  1. Birds

  2. Rabbit

  3. Frogs

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The skin does not merely protect the frog but helps in respiration. Fine blood vessels run throughout the frog's skin; oxygen can pass through the membranous skin, thereby entering directly into the blood. When a frog submerges beneath the water, all its respiration takes place through the skin. Oxygen is obtained directly from the water.

Multiple choice

In termites, the cellouse of wood is digested by ________.

  1. protozoans

  2. bacteria

  3. protozoans and bacteria

  4. cellouse breaking enzyme B-amylase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In lower termites, cellulose (the main component of wood) is digested by protozoans living in their hindgut. These protozoans produce cellulase enzymes that break down cellulose into simpler compounds that termites can absorb. Higher termites lack protozoans and rely solely on bacteria and their own enzymes. Option C (both) is incorrect because the question specifically asks about termites in general, where protozoans are the distinctive answer.

Multiple choice

Agar-agar is obtained from

  1. green algae

  2. red algae

  3. bacteria

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

The gelling agent in agar-agar is an unbranched polysaccharide obtained from the cell walls of some species of red algae.

Multiple choice

Lower animals are called invertebrates because _____________.

  1. they do not have fixed shape

  2. they are unicellular organisms

  3. they do not have backbone

  4. they are found in all kinds of habitats

  5. they are saprophytes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The animals, which do not have backbone in their body are called invertebrates.

Multiple choice

Which one of the following algae is an important source of mannitol?

  1. Chlorella

  2. Gelidium

  3. Laminaria

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

Laminaria (brown algae) is commercially important as a source of mannitol, a sugar alcohol used as a sweetener and in medicine. Chlorella is used for protein/supplements, Gelidium for agar, and Sargassum for alginate - not primarily for mannitol.