Problem 67 - Objective Biology for NEET

Question

Air bladders are shown by (a) Fucus (b) Laminaria (c) Dictyota (d) All of these

Step-by-Step Solution

Answer

The sea plant with air bladders from the given list is Fucus.

Step 1: Understanding the Exercise

You need to check the air bladder-bearing plants from the given list - Fucus, Laminaria, Dictyota.

Step 2: Recall or Lookup the Information

The characteristics of these plants must be memorized, if you already know about them. If you don't remember, textbook or internet could be fast information sources.

Step 3: Answer the Question

Recognize that Fucus is the plant with air bladders amongst the given options. Therefore, the answer is option (a) - Fucus.

Key Concepts

Air Bladders in Plants

One fascinating adaptation some aquatic plants have evolved is the development of air bladders. These structures allow plants to float on the surface of the water, maximizing their exposure to sunlight and facilitating gas exchange for photosynthesis.

In simpler terms, think of air bladders like little buoys that help plants stay afloat. These aren't found in all aquatic plants but are quite common in species that live in water bodies where sunlight can be a scarce resource. Essentially, these air-filled sacs offset the plant's weight and keep them stable at the water's surface. This adaptation demonstrates how organisms can evolve to thrive in various environments. The presence of air bladders can be crucial for survival in aquatic ecosystems dominated by competition for light.

Plant Adaptations

Plants exhibit an array of adaptations that allow them to live in diverse environments. An adaptation is simply a feature or behavior that enhances a plant's ability to survive and reproduce.

Examples of plant adaptations include thick waxy leaves to reduce water loss in deserts, shallow but widespread roots to maximize water absorption, and thorns to deter herbivores. In aquatic environments, adaptations aren't just limited to air bladders; floating leaves, flexible stems that can withstand currents, and specialized root systems are all part of the ingenious ways plants have adapted to their watery surroundings. These characteristics highlight the beauty of evolution, where each organism fine-tunes its features to fit its habitat perfectly.

Fucus Characteristics

Fucus is a fascinating genus of brown algae, commonly found in marine environments such as rocky shores. They exhibit a variety of specialized adaptations that allow them to survive in the intertidal zone—a harsh and fluctuating environment.

Distinct Features

Among these features, Fucus species often possess air bladders that help them remain buoyant during high tides. Furthermore, their leaves, known as fronds, have a tough, waxy coating that helps prevent desiccation when exposed to air during low tides. This waxy layer also defends against marine herbivores and the abrasive action of water and sediment. Another characteristic of Fucus is their reproductive strategy, which involves the release of gametes directly into the water, highlighting a life cycle finely tuned to the rhythm of the sea.