Leaf like photosynthetic organ is associated with algal groupa)Showing...
The members of phaeophyceae or brown algae are found primarily in marine habitats. They show great variation in size and form. They range from simple branched, filamentous forms (Ectocarpus) to profusely branched forms as represented by kelps, which may reach a height of 100 metres.They possess chlorophyll a, c, carotenoids and xanthophylls. They vary in colour from olive green to various shades of brown depending upon the amount of the xanthophyll pigment, fucoxanthin present in them. Food is stored as complex carbohydrates, which may be in the form of laminarin or mannitol. The vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating of algin. The protoplast contains, in addition to plastids, a centrally located vacuole and nucleus. The plant body is usually attached to the substratum by a holdfast, and has a stalk, the stipe and leaf like photosynthetic organ – the frond.
Leaf like photosynthetic organ is associated with algal groupa)Showing...
Leaf-like Photosynthetic Organ in Algal Groups
The question pertains to identifying the algal group characterized by leaf-like photosynthetic organs and a specific feature among the options provided. The correct answer is option 'C', where members may reach a height of 100 meters.
Understanding the Algal Group
- The algal group that can reach such heights is primarily the *Chlorophyta*, or green algae.
- This group includes species like *Macrocystis pyrifera*, commonly known as giant kelp, which can grow up to 100 meters long.
Characteristics of the Algal Group
- **Leaf-like Structures**:
- Members of this group exhibit leaf-like structures called fronds, which enhance their ability to perform photosynthesis.
- **Habitat**:
- They typically inhabit marine environments, thriving in nutrient-rich waters.
Comparison with Other Options
- **Option A**: Showing only oogamous reproduction.
- Oogamous reproduction is characteristic of some algal groups, but is not exclusive to all.
- **Option B**: Having predominance of r-phycoerythrin.
- r-phycoerythrin is primarily found in red algae (*Rhodophyta*), not in green algae.
- **Option D**: Usually having grass-green color.
- While many green algae are grass-green due to chlorophyll, the defining feature of height is more distinct in kelp.
Conclusion
In summary, the algal group that can attain heights of up to 100 meters, characterized by its leaf-like photosynthetic organs, is primarily the giant kelp of the green algae. This distinguishes it from other algal groups based on size and structure.
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