Biology · Science General

Diversity in Living Organisms

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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

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.

Multiple choice

It is a hypothesis that mitochondria evolved from endosymbiotic bacteria. Therefore, mitochondria are similar to bacteria in many ways. Which of the following is NOT a similarity between mitochondria and bacteria?

  1. Both have circular, double stranded DNA.

  2. Both have 70S ribosomes.

  3. Both are about the same size.

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

Both have 70S ribosomes. Ribosomes are cellular organelles that take part in protein synthesis. They are made up of two sub units: small and large. Bacteria have 70S ribosomes. Their small subunit is called 30S and the large one is called 50S. Mitochondria have 55S ribosome: 30S and 40S.