Which plants have the most stomata?

In vascular plants the number, size and distribution of stomata varies widely. Dicotyledons usually have more stomata on the lower surface of the leaves than the upper surface. Monocotyledons such as onion, oat and maize may have about the same number of stomata on both leaf surfaces.

Which leaf has the most stomata?

All surfaces of the leaf have some amount of stomata for regulating gas exchange for photosynthesis. However, the lower epidermis (the underside of the leaf) has more, because it is more often in the shade and so it is cooler, which means evaporation won’t take place as much.

Do shorter trees have higher stomatal density?

Higher densities of small stomata lead to increases in stomatal conductance to water vapor over the same total pore area, due to the shorter diffusion path length (45) . … … In addition, greater stomatal density was observed in genotypes with resistance to water stress [60,63].

Do taller trees have higher stomatal density?

Although we did not find what we were expecting, we found that there was no overall difference in data. The number of stomata on each leaf, throughout different heights on the plant had no significant difference from one another, meaning no change.

Do desert plants have more stomata?

Many desert plants have very small stomata and fewer stomata than those of other plants. … This waxy substance does not cover the stomata, but it covers most of the leaves, keeping the plants cooler and reducing evaporative loss. Small leaves on desert plants also help reduce moisture loss during transpiration.

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.

How does sunlight affect stomatal density?

Stomata will be found more in leaves less exposed to sunlight to reduce evaporation or water loss. Species with higher stomatal density tend to be more responsive to the increase in CO2, so the rate of photosynthesis is greater [21].

What affects stomatal density?

Stomatal size and density are known to change in response to a variety of environmental factors, including temperature (Limin et al. 2007), water availability (Pääkkönen et al. 1998), light (Eensalu et al. 2008), soil nutrients (Frey et al.

How does plant height affect transpiration?

Abstract. Treetops become increasingly constrained by gravity-induced water stress as they approach maximum height. … Average treetop sap velocity (VS), transpiration per unit leaf area (EL) and stomatal conductance per unit leaf area (GS) significantly decreased with increasing height.

What type of plants do you expect to have the highest density of stomata Why?

The highest number of stomata is1200 per square mm on leaves of the Spanish oak tree. Stomata are found on conifer needles as well as on the broad leaves of angiosperms. Stomata found on the bottom surface of a pine leaf. There are several environmental factors that affect the number of stomata on a leaf.

Do larger leaves have more stomata?

found that stomatal density was inversely related to leaf size, due to a higher cell insertion (number of cells per unit area) in smaller leaves.

What causes higher stomatal density?

Thus, one might expect plant leaves exposed to drought conditions to have fewer stomata in sunlit environments. … In this case, stomata density may increase or decrease in response to environmental variation in sunlight and water availability.

Why lower epidermis have more stomata?

The stomata must be open during the daylight hours to let oxygen and carbon dioxide pass through. While they are open, water vapor escapes into the atmosphere (transpiration). … Transpiration is the loss of water through stomata, so, more stomata are found on the lower surface to prevent excessive loss of water.

Do small leaves have more stomata?

Stomatal size correlated negatively with speed of opening and positively with T-50%, confirming that smaller stomata open faster than large stomata. The two early successional species were very different in stomatal size and density, and in response to light.

Why do desert plants have less stomata?

Thus, due to such harsh conditions, plants that exist in the desert have thick stems, leaves either narrow, small or turned into spikes leaving them with fewer stomata. … This helps in water loss by preventing evaporation through the stomata.

Why lotus leaves have stomata on the upper surface?

Lotus are water plants that have leaves that float on water. The stomata are adapted for gas exchange so must be on the upper surface of the leaf to carry out that function.

Which type of leaf has more stomata on its lower surface?

Answer: Usually the lower surface of a dicot leaf has a greater number of stomata while in a monocot leaf they are more or less equal on both surfaces. In most of the floating plants, stomata are found.

What is Apple type stomata?

Stomata are present only on the lower epidermal surface of the leaf in the case of apple or mulberry type of stomata. Hence, leaves containing this type of stomata are also known as hypostomatic leaves. Plants containing this type of stomata are apple, pear, walnuts, mulberry, etc.