Week 7
Topic : Microorganisms in terrestrial ecosystem
This week we continue with the topic soil population. Bacteria is the numerous microbes in the soil and they can be found on the surfaces of soil particles. Soil bacteria function as decomposers, mutualists, pathogens, and lithotrophs or chemoautotrophs. Besides bacteria, fungi also play important roles in soil as decomposers, mutualists and pathogens or parasites. Verticillium, Phytium and Rhizoctonia are the examples of fungi soil pathogens. Other than bacteria and fungi, there is minority of protozoa which is exposed outer surface of surface particle, only 15 cm from top soil. Soil protozoa function as mineralizing nutrients, regulating bacteria populations and food source.
Microbe plant interaction.
Mycorrhizae can be described as a symbiotic relationship between a fungus and a plant. Due to the fact that this is a symbiotic relationship, both the fungus and the plant benefit from this interaction (mutualistic). Mycorrhizae provide enhanced nutrient uptake for plant. Mycorrhizal associations consists of endomycorrhizae and ectomycorrhizae.
Endomycorrhizae (left) and ectomycorrhizae (right).
In ectomycorrhizae, nutrients taken up by rhizomorphs pass through hypal sheath then into Hartig net filaments which have numerous contact with root cells.
The most common type of mycorrhizae is arbuscular mycorrhizae (AM). This type of mycorrhizae provide plant host with protection from disease, drought, nematodes and other pests. It also transfer phosphorus to roots and provides ammonium to host. This natural attraction of phosphorus has lead to its ability to become widespread and very comon. Nutrient transport occurs through symbiotic structures inside plant root cells known as arbuscules.
Arbuscular mycorrhizae (AM).
Topic : Hydrosphere
Before the class on topic hydrosphere, we have to look for the flipped classroom that prepared by group 3. They make a good effort to make the ways of presentation attractive but simple. They had prepared the thinglink for freshwater and marine environment, presentation in videos and also crossword puzzle. And of course before answering the crossword puzzle, I need to study and understand the topic on the link given.
Thinglink on marine environment.
Crossword puzzle about hydrosphere.
Video presentation about hydrosphere.
Apart from learning about the hydrosphere, I can also find out and learn new application to make our presentation attractive and informative.
On Friday, we were asked by Dr. Wan to answer a few question based on hydrosphere topic. We need to draw a digram that describe the nutrient cycle in the aquatic environment. I managed to draw the microbial loop diagram although not all correct. Second question is differentiate between oligotrophic and eutrophic lakes. For this question, I was able to state one differences only. :(
microbial loop.
differences between oligotrophic and eutrophic.
From this activity I can know how much that I really know and understand, and which part that I don't understand or maybe I don't really focus on that.
The lecture continued on the zones of lakes or pond based on light penetration and temperature. Littoral zone and limnetic zone get full light penetration while profundal zone which is near the benthic zone get very low penetration of sunlight. Zonation of lakes based on temperature consists of epilimnion, thermocline and hypolimnion. The lowest temperature and light penetration is hypolimnion.
Thats all for this week. :)
This week we continue with the topic soil population. Bacteria is the numerous microbes in the soil and they can be found on the surfaces of soil particles. Soil bacteria function as decomposers, mutualists, pathogens, and lithotrophs or chemoautotrophs. Besides bacteria, fungi also play important roles in soil as decomposers, mutualists and pathogens or parasites. Verticillium, Phytium and Rhizoctonia are the examples of fungi soil pathogens. Other than bacteria and fungi, there is minority of protozoa which is exposed outer surface of surface particle, only 15 cm from top soil. Soil protozoa function as mineralizing nutrients, regulating bacteria populations and food source.
Microbe plant interaction.
Mycorrhizae can be described as a symbiotic relationship between a fungus and a plant. Due to the fact that this is a symbiotic relationship, both the fungus and the plant benefit from this interaction (mutualistic). Mycorrhizae provide enhanced nutrient uptake for plant. Mycorrhizal associations consists of endomycorrhizae and ectomycorrhizae.
Endomycorrhizae (left) and ectomycorrhizae (right).
In ectomycorrhizae, nutrients taken up by rhizomorphs pass through hypal sheath then into Hartig net filaments which have numerous contact with root cells.
The most common type of mycorrhizae is arbuscular mycorrhizae (AM). This type of mycorrhizae provide plant host with protection from disease, drought, nematodes and other pests. It also transfer phosphorus to roots and provides ammonium to host. This natural attraction of phosphorus has lead to its ability to become widespread and very comon. Nutrient transport occurs through symbiotic structures inside plant root cells known as arbuscules.
Arbuscular mycorrhizae (AM).
Topic : Hydrosphere
Before the class on topic hydrosphere, we have to look for the flipped classroom that prepared by group 3. They make a good effort to make the ways of presentation attractive but simple. They had prepared the thinglink for freshwater and marine environment, presentation in videos and also crossword puzzle. And of course before answering the crossword puzzle, I need to study and understand the topic on the link given.
Thinglink on marine environment.
Crossword puzzle about hydrosphere.
Video presentation about hydrosphere.
Apart from learning about the hydrosphere, I can also find out and learn new application to make our presentation attractive and informative.
On Friday, we were asked by Dr. Wan to answer a few question based on hydrosphere topic. We need to draw a digram that describe the nutrient cycle in the aquatic environment. I managed to draw the microbial loop diagram although not all correct. Second question is differentiate between oligotrophic and eutrophic lakes. For this question, I was able to state one differences only. :(
microbial loop.
differences between oligotrophic and eutrophic.
From this activity I can know how much that I really know and understand, and which part that I don't understand or maybe I don't really focus on that.
The lecture continued on the zones of lakes or pond based on light penetration and temperature. Littoral zone and limnetic zone get full light penetration while profundal zone which is near the benthic zone get very low penetration of sunlight. Zonation of lakes based on temperature consists of epilimnion, thermocline and hypolimnion. The lowest temperature and light penetration is hypolimnion.
Thats all for this week. :)
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