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  Compressed TOC
The Process of Protein Digestion
Adaptation of Parasites to their mode of Life
Micro-organisms and food processing:
   The Bacteria
   The Fungi 
Methods of Food Preservation
Adaptation of the Mammalian Heart to its Functions
Transportation of gases in the blood:
   Oxygen
   Carbon Dioxide
The mechanism of movement of water from soil to leaves of a tall plant
The Mechanism of Translocation by:
   Cytoplasmic Streaming
   Mass Flow
Adaptations of the Phloem Tissue
The role of Transpiration in plants
The Environmental Factors Affecting Transpiration
Gaseous Exchange in plants and Animals
Adaptations of the airways for gaseous exchange
Adaptations of the Lungs for Gaseous exchange
The process of Inspiration and Expiration in Mammals
Mechanism of gaseous Exchange in:
       Bony Fish,
       Frog,
       Insect
The Mechanism of Opening and Closing of Stomata
Adaptation of the Kidney to its Functions
Formation of Urea in Human Body
Adaptations of the Human Skin to its Functions
Changes on the Skin due to Temperature Variation
The Role of Hormones in Homeostasis
Reproduction In Animals
Adaptation of the Mammalian Male Reproductive Organ to its Functions
The Influence of Hormones on Menstrual Cycle
Mechanisms that hinder self-fertilization  in Plants
The adaptations of Insect-Pollinated flowers
Events that take place after fertilization until a new fruit is formed
Adaptation of seeds for Dispersal
Water and Air Pollution, and the remedies
Adaptation of plants to their Habitat
     Xerophytes (Desert Plants);
     Hydrophytes (Water Plants)

 
 

..Home/Contents/ Xerophytes

 


Adaptations Xerophytes (desert plants):

Structural adaptations:

The number of the stomata is reduced so that few or no pores at exposed to water loss through transpiration 

Their leaves are modified into spines/ thorn like structures to reduce the area exposed for transpiration

The leaves have a thick waxy cuticle to reduce water through the cuticular transpiration. 

They have deep roots that extend to the water tables beneath the soil for their survival. 

Most of them have superficial roots that form large extensions on the surface the earth to make use of the torrential rain that happen sporadically. 

Some have hairy leaves that trap water vapour in between them to lower the diffusion gradient hence reducing water loss. 

Physiological adaptations:

They fold their leaves especially during the day to decrease the number of the stomata that is exposed hence reducing the rate of transpiration

They shed their leaves during dry seasons son that they would avoid water loss through transpiration

Some experience reversed stomatal rhythm. That is the stomata opens at night when the rate of transpiration is low for gaseous exchange but closes during the day when the rate of transpiration is high


 

 

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