Why do marram grass have sunken stomata?
Conserving water The stomata – the openings through which water vapour moves out of plants, are sunk in pits within the curls so they can hang on to as much H20 as possible.
What does a sunken stomata mean?
A sunken stomata is a stomata in a small pit, i.e. stomata are embedded into the leaf layers rather than on the surface of the leaves. This helps in protecting against the escaping water vapor from air currents thereby decreasing water loss from the leaf and hence decreasing transpiration.
What adaptations does marram grass have that help it survive in its environment?
Marram is adapted to grow upwards and out of the top of the dune. In addition, marram and lyme grass have leaves that can curl into a cylinder in order to limit the loss of water in the constant wind. The lower surface of the leaf, where stomata take in carbon dioxide, also loses a lot of water.
Why do halophytes have sunken stomata?
Sunken stomata ensure less water loss, thus reduces the rate of transpiration. Hence, these are characteristically found in xerophytes. In order to reduce transpiration, a maximum number of stomata in a dorsiventral leaf are present on the lower surface.
What are the characteristics of marram grass?
The dense tufts of spiky Marram grass are a distinctive feature of this plant. Its leaves are rolled and it displays densely packed, golden flower spikes.
How does marram grass conserve water?
Marram grass has a rolled leaf that creates a localized environment of water vapour concentration within the leaf, and helps to prevent water loss. The stomata sit in small pits within the curls of the structure, which make them less likely to open and to lose water.
How does sunken stomata help plants?
The sunken stomata creates a small pocket of moist air. The high humidity in the air pocket reduces the water potential gradient between the leaf air spaces and the exterior, and therefore decreases the rate of transpiration.
What is the advantage of sunken stomata?
The advantage of sunken stomata are, – They trap moist air which in turn reduces diffusion, thereby by reducing water loss. – They help in reducing the rate of transpiration.
What does marram grass do?
But Marram grass is not just a convenient child’s sword or hiding place, it plays a vital role in stabilising the dunes, its fibrous, matted roots binding the sand down, which helps to encourage the colonisation of other plants.
Do halophytes have sunken stomata?
Therefore, this is the correct option. Option D: In Halophytes i.e, plants living in the saline condition, have the stomata present on the upper surface of the leaf.
What are the adaptations of halophytes?
Halophytes are well-adapted and thrive under high salinity by using two strategies, salt tolerance, and salt avoidance. Generally, halophytes follow three mechanisms of salt tolerance; reduction of the Na+ influx, compartmentalization, and excretion of sodium ions (Flowers and Colmer, 2008, 2015).
Why is marram grass important?
How is marram grass formed?
Marram thrives in shifting sand. It has long root systems and survives when the wind naturally blows lots of sand on top of it, simply growing up through the new deposits.
What plants have sunken stomata?
Plants with sunken stomata are usually xerophytes.
How does sunken stomata affect transpiration?
Where do you find sunken stomata?
Sunken stomata are found sunken in the leaves. These are present in a small pit embedded in the inner leaf layers. These stomata have developed as an adaptation for plants growing in water-scarce conditions.
In which plants sunken stomata are usually found?
Sunken stomata are usually found in crassulacean acid metabolism plants. Such stomata remain situated below the epidermis and open at night.
How does marram grass reduce water loss?
Where are stomata present in halophytes?
In Halophytes i.e, plants living in the saline condition, have the stomata present on the upper surface of the leaf.
Which plants have sunken stomata?
Some plants with SUNKEN STOMATA are Nerium, Pine, Acacia, etc. Plants growing mostly in xerophytic conditions have sunken stomata where they need to reduce transpiration rate. For e.g. Pinus , dracaena , yucca, opuntia etc.