Problem 59 - Objective Biology for NEET

Question

Which of the following is known as Portuguese man-of-war? (a) gorgonia (b) aurelia (c) physalia (d) obelia

Step-by-Step Solution

Answer

The Portuguese man-of-war is known as physalia.

Step 1: Recall the information

In marine biology, different species have both their scientific names and common names. Portuguese man-of-war is a common name and in this exercise, the intention is to match it with the correct scientific name. From the options, the correct match for Portuguese man-of-war is 'physalia'.

Step 2: Select the correct option

By recalling the correct information, the corresponding scientific name for Portuguese man-of-war is 'physalia'. Therefore, the correct option is (c) physalia.

Key Concepts

Understanding Scientific Names

In the world of science, especially biology, scientific names are used to avoid confusion. Everyday language, or common names, might be different across countries and languages. Scientific names are universal. They help scientists and researchers communicate clearly.Scientific names follow specific rules:

• They are typically in Latin or Greek.
• Each name has two parts - the genus and the species.
• This two-part system is called binomial nomenclature.

For example, in "Physalia physalis," \(\(\textit{Physalia}\)\) is the genus.
The second part, \(\(\textit{physalis}\)\), specifies the species. This way everyone, regardless of language, knows exactly which organism is being discussed. So, when referring to the Portuguese man-of-war, using 'Physalia' makes it clear.

Introduction to Marine Biology

Marine biology is the study of ocean life. It covers a wide range of living things, from tiny plankton to massive whales. Marine biology helps us understand how ocean organisms live and interact. It is crucial because oceans cover about 70% of Earth's surface, impacting global climate and weather systems. Some key areas in marine biology include:

• Behavioral study of marine animals.
• Marine ecosystems and habitats, such as coral reefs.
• The impact of human activities on the marine environment.

By studying marine biology, scientists can make better conservation decisions.
They can protect delicate ocean ecosystems while ensuring sustainable use of ocean resources.

Discovering Physalia, the Portuguese Man-of-War

Physalia, commonly known as the Portuguese man-of-war, is a fascinating marine organism. Although it looks like a jellyfish, it is actually a siphonophore. This means it is not a single creature but a colony of smaller units called zooids. These zooids work together, each contributing to survival. Key facts about Physalia include:

• It floats on the water surface using a gas-filled bladder.
• The tentacles can deliver a painful sting, used for capturing prey.
• Physalia is found in tropical and subtropical oceans worldwide.

Understanding Physalia helps in respecting its power.
While beautiful, it should be admired from a distance due to its venomous nature.