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 algae act as a source for the isolation of the laboratory culture medium component like agar?

  1. Brown algae

  2. Red algae

  3. Golden brown algae

  4. Yellow green algae

  5. Diatoms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The cell walls of most red algae include a rigid inner part composed of microfibrils and a mucilaginous matrix. The matrix is composed of sulphated polymer of galactose called agar, funori, porphysan and carrageenan. These four polymers give the red algae a flexible slippery texture. Agar is a component of the cell walls of several species of red algae. Agar is a mixture of two components; linear polysaccharide agarose and a heterogenous mixture of smaller molecules called agaropectin.

Multiple choice

Give an example for a bacterium that naturally has no cell walls?

  1. Deinococcus

  2. Pneumococcus

  3. Thermoplasma

  4. Mycobacterium

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

Bacteria that are naturally having no cell walls include Mycoplasma and Ureaplasma. Ureaplasma is a type of bacteria in the family of bacteria known as Mycoplasma. These bacteria are incredibly tiny and are unique in that they lack a cell wall. Because the cell wall is the part of the bacteria attacked by a number of antibiotics, some common antibiotics such as those in the beta lactam family are not effective against these bacteria.

Multiple choice

In which of the given bacteria gliding motility is not observed?

  1. Cyanobacteria

  2. Myxobacteria

  3. Proteus

  4. Cytophaga

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

Some bacteria also use flagella to move over the tops of solid surfaces in a form of movement called swarming. Swarming motility is operationally defined as a rapid multicellular bacterial surface movement powered by rotating flagella. Swarming motility was first reported by Jorgen Henrichsen and has been mostly studied in genus Serratia, Salmonella, Aeromonas, Bacillus, Yersinia, Pseudomonas, Proteus, Vibrio, and Escherichia.

Multiple choice

How are polyps and medusae forms of cnidarians similar?

  1. Both can be motile.

  2. Both have mature gonads.

  3. Both have poorly developed muscular system.

  4. Both are diploblastic.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the characteristic of all cnidarians. So, in this respect polyps and medusae are similar.

Multiple choice

What kind of symmetry and how many body layers are possessed by cnidarians?

  1. Radial or biradial symmetry, and diploblastic

  2. Radial symmetry and triploblastic

  3. Bilateral symmetry and diploblastic

  4. Bilateral symmetry and triploblastic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cnidarians possess radial symmetry in which an organism can be divided into similar halves by any plane that contains the main axis.They are also diploblastic, i.e. body is derived from two germ layers.

Multiple choice

Cnidarians are considered as more advanced than poriferans because of

  1. the presence of true germ layers

  2. muscle cells

  3. the presence of nematocysts

  4. an indefinite symmetry
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nematocysts are the exclusive cells of  cnidarians, which are multifunctional such as used for offence, defence, locomotion etc that are not present in the poriferans.

Multiple choice

Directions: Answer the following question by selecting the most appropriate option.

An egret bird is often seen on a buffalo's back. This is because the egret

  1. feeds on parasites on the buffalo's back

  2. feeds on insects present in the grass

  3. loves to sing while sitting on the buffalo's back '

  4. rests after flying for a while
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The egret and buffalo have a mutually beneficial relationship where the egret eats parasites like ticks and flies off the buffalo's back. This provides food for the egret while giving the buffalo relief from pests that could cause disease or discomfort.