2. 2. Write the answers :
1. Explain the functions of plant organs.
12. Explain the different properties of water. .
3. Write the definition of the word adaptation.
Answers
Answer:
Transpiration and Structure of Stomata
Transpiration is the process in which plants release the water inside it in the form of moisture or water vapor. Roots consume some amount of water from the soil and the rest evaporates in the atmosphere. Parts of plants such as stems, small pores on leaves, and flowers evaporate the water to the atmosphere. In other words, it is the process in which water evaporates in the atmosphere from plant leaves and other parts. Let us study more about it.Types of Transpiration
Depending on the organ that performs transpiration, the different types are:
Stomatal transpiration: It is the evaporation of water through stomata. Stomata are specialized pores in the leaves. They account for around 80 to 90% of the total water loss from the plants.
Cuticular transpiration: Cuticle is an impermeable covering present on the leaves and stem. It causes around 20% of transpiration in plants. Cuticular transpiration is lesser in xerophytes because they have thicker cuticles.
Lenticular Transpiration: It is the evaporation of water through lenticels. Lenticels are the tiny openings present on the woody barkStructure of Stomata
Stomata are the tiny pores present in the epidermal surface of leaves. Two kidney-shaped cells known as guard cells, guard the pores. The inner wall of the guard cell towards the stomata is thicker as compared to the outer walls. Also, the peculiar arrangement of the microfibrils of the guard cells aids in opening and closing of the stomatal aperture.
Transpiration in plants
Source: prepjunkie
The orientation of microfibrils is radial rather than longitudinal. This helps stomata to open easily. In a dorsiventral dicotyledonous leaf, the number of stomata on the lower surface is higher when compared to the upper surface. This adaptation helps in reducing the evaporation of water. In isobilateral leaf in a monocotyledonous plant, the number of stomata is equal on both the surfaces.
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