How Does Duckweed Grow In Organicwater

      The general characteristics of the plants in these bodies of water have strong and steady roots, or roots that are bendable, depending on how fast the current of the water is. These traits help the plants mainly so they do not get swept away. Plants that

If saltwater is applied to a plant, the plant would shrivel up and die. This is a result of the water moving out of the cells in order to try to balance the concentration of solute compared to inside the cell. The water movement out of the cell would cause the cell to shrink and the lack of water would eventually cause the plant to die.

Measure out freshwater, equating enough for all three plants, especially when the plant is submerged in the water.

Duckweed are flowering aquatic plants which float on or just beneath the surface of still or slow-moving bodies of fresh water and wetlands (Sheh-May 2004). Botanists classify them as a separate family, Lemnaceae. These plants are simple in structure by lacking a visible stem or leaves. The larger part of each plant is a small prearranged "thallus" or "frond" structure that is only a few cells thick. These contain air pockets made of a spongey tissue called aerenchyma that allows the plant to float on top of or just beneath the surface of the water (Sculthorpe 1984). Reproduction is done primarily by asexual budding. This occurs at the base of the frond where the meristem is enclosed.

Observation: A higher density of plants were observed to grow near a source of water with the plant density decreasing as the distance to the water source increased.

How does the amount of salinity affect how much oxygen is given off by duckweed?

Plants come in different shapes, colors and sizes. Redwood trees, found in California, are the tallest plants on Earth. The tallest redwood ever recorded was 379 feet tall in 2006. The smallest flowering plants in the world are watermeal, also called duckweed. They can be found all over the world and are as tiny as a grain of rice.

Duckweed (lemnaceae) is a plant the reproduces by duplicating itself. It’s remarkable because it can survive in extreme environments with temperate climates with the exception of frozen poles and dry deserts, explains naturina.per.sg. It is a prime example of exponential growth because as naturina.per.sg reports it can double in as a few as 2 days. This is possible because under ideal conditions it has all the nutrients to spark growth. NPK Nitrogen, Phosphorus, and Potassium are nutrients essential to the growth of plants.

The results of this experiment clearly show a neutral pH is a much better solution for seeds to germinate in. Therefore, the solution with a pH of 7 is preferable for seed growth and germination than any solution that is acidic. However, since the basic solutions have not been tested, the results that a neutral solution is the best for growth cannot be fully true. Another experiment with solutions that have a pH of more than 7 would need to be tested to get accurate results. The seeds watered with a neutral solution with a pH of 7 grew an abundant amount more than those watered with the diluted lemon juice with a pH of 3.

abiotic and biotic factors and how they influenced each other in a small freshwater ecosystem.

As aquatic plants, duckweeds grow in large, dense, green colonies. These plants belong to the scientific group of floating plants, Lemnaceae, and often envelop the outer water surface. Unlike other vascular plants, the leaves of duckweeds are fused into “fronds.” The biomass and number of fronds tremendously doubles in optimum growth conditions, such as salinity, light intensity, nutrient supply, and temperature. These plants have desirable morphological properties that render them ideal candidates for low-cost waste water purification and conversion of nutrients to biomass (Xu and Shen, 2011). This experiment is motivated by limited literature on the impacts of varying salt concentration on the growth of duckweeds. Meanwhile, a wide range of salt concentration favor the growth of these weeds (Xu and Shen, 2011). Little is known about the natural salinity tolerance limit for duckweeds due to limited studies have reported related findings at different salt concentrations.

As duckweed is a plant that tends to gather among still water, the growth can be very harmful to the lives of certain animals, depending on the environment. Potential hazards may include a range of contaminants, such as heavy metals, mycotoxins, pesticide residues, as well as pathogens (Spiegen et al, 2013). “Duckweed is a tiny floating aquatic plant that is characterized by a rapid growth, high tolerance to polluted water, global distribution, and high starch content” (Ishizawa et al, 2017). As duckweed has a rapid growth and can spread thousands of buds within a short, few week spans, learning key factors about duckweed could enhance the societies ability to help the environment. When tested to determine the ecotoxicity of beta-blockers, Lemna minor (a type of duckweed) was tested against Desmodesmus subspicatus and Daphnia magna, and studies showed that the duckweed was the least sensitive species (Cleuvers, 2005). Although duckweed is harmful at times, studies have proven that it can also be put to a beneficial use, such as animal feed, organic fertilizer, and chemical toxicity tests (Ishizawa et al, 2017). We began our experiment with the hopes of determining what type of water effects the growth of duckweed the most, which will result in what animals and environments are affected the greatest by this plant.

To study the effects of hypotonic, hypertonic and isotonic solutions on plant and animal cells.

Our aim was to test the effect of different salinities on the growth of plants which what we did was measured different amounts of salt dissolved into 2 litres of water, watered the plant once with the salt water then for 9 days with pure ware. I found with my investigation that the less the salt, the more the growth of the plant. My aim was achieved by measuring the 5 fastest geminating (out of 20) and to measure the differences in growth of the plant. I also had a few difficulties in the duration of this experiment which were the sunlight on the plants direct which made the plants to begin to die and also the highest salinity plant was not growing.

Cynodon dactylon (Couch Grass) was selected as the model plant for the experiment, which was purchased from a local nursery. This is due to its ability to survive on low amounts of water because of its extensive root system (BioNET-EAFRINET 2016). In order to reduce the effects of other growing media on the testing substrate, the Cynodon dactylon (couch) roll was washed with water before planting onto planting pots.