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

Invertebrates are the organisms which

  1. lack backbone

  2. possess vertebral column

  3. lack tail and bones

  4. possess scaly skin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Organisms which lack backbone are called invertebrates.

Multiple choice

You will hear a recording. Click on the paragraph that best relates to the recording.

  1. Dolphins, whales and porpoises are all social animals, but some species are more sociable than others. This depends on the environment because a species adopts the lifestyle most suitable for this. Among dolphins, forming groups makes it easier for them to find food, reproduce and gain knowledge. They are safer, too, because dolphins can communicate danger when there are threats around.

  2. The speaker explains that whales, dolphins, and porpoises have evolved differently and face different threats. River dolphin numbers are declining, while ocean dolphins are doing well in spite of the threats they face. The reason for this is that ocean dolphins are better adapted for finding food and avoiding predators.

  3. Dolphins have adopted group living as a response to living in close contact with other animals in the ocean, some of which kill dolphins for food. Living in social groups makes it easier to hunt for food and, in a dangerous environment, it makes sense in terms of safety to move about in large numbers.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The speaker says: All whales, dolphins and porpoises are social animals, although the degree of sociability varies greatly from one species to another. ... we can expect the group size adopted by a species to be the most suitable for its environment and lifestyle.... Some o f the reasons for living in groups include greater efficiency in searching for and catching food, benefits for mating, learning, defence, and sensory integration.... For example, i f one animal discovers a shoal of fish or a hungry shark, it can immediately pass on this information to the others in the group so that all may benefit.

Multiple choice

Which of the following is not blue-green algae?

  1. Nostoc

  2. Anabena

  3. Aulosira

  4. Lichen

  5. -
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A lichen is a composite organism. The combined life form has properties that are very different from the properties of its component organisms.

Multiple choice

Which of the following correctly differentiates a prokaryotic cell from a eukaryotic cell?

  1. Prokaryotic cells do not perform photosynthesis but eukaryotic cells perform photosynthesis.

  2. Prokaryotic organisms lack cytoplasm but eukaryotic organisms possess cytoplasm.

  3. Nuclear membrane is absent in prokaryotes but it is present in eukaryotic organisms.

  4. Prokaryotes have a well defined nuclear region but eukaryotes possess nucleoid that contains only nucleic acid.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nuclear membrane is absent in prokaryotes as they do not have a well developed nucleus and the nuclear material is said to be nucleiod. But, eukaryotes possess a well-defined nuclear membrane around the nucleus of the cell.

Multiple choice

Which of the following are not found in hydra?

  1. Epitheliomuscular cells

  2. Cnidocytes

  3. Choanocytes

  4. Nerve cells

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

These are flagellated cells with a collar of protoplasm at the base of the flagellum, numbers of which line the internal chambers of sponges. These are not found in hydra.

Multiple choice

Body cavity of adult Ascaris is

  1. haemocoel

  2. amphocoel

  3. pseudocoel

  4. schizocoel

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

A body cavity (as in various worms) that is not the product of gastrulation and is not lined with a well-defined mesodermal membrane is pseudocoel.