Which of the following best describes transpiration?
Neet bio – transpirational pull
Isn’t the above not an evolutionary adaptation to land life? Which of the following statements about sugar movement in phloem is correct? C3 photosynthesis3 In the plant, movement can occur both upward and downward. 4Assuming all other variables are equal, what kind of day will result in the most light exposure and the least shading of lower leaves? crop emergence at a 137.5 degree angle from the previous leaf site10Plants do not have a circulatory system like animals. Sugars; leaf; apical meristem; if Phloem transports from the source to the sink. 12 Which of the following structures or compartments does not belong to the apoplast? the diameter of a sieve tube’s lumen 13Is it true that pine seedlings grown in sterile potting soil develop much more slowly than phloem? In phloem sap, companion cells regulate the rate and direction of movement. Except for DNA structure, all of the following have an impact on water potential in plants. 16With the exception of leaf temperatures, all of the above will occur if the guard cells and surrounding epidermal cells in a plant were deficient in potassium ions.17Which of the following claims regarding plant transport is false? Gymnosperms may have unusually high root pressure at times.
Science -xylem, phloem, transpiration pull – english
For a plant anatomy lesson, students are drawing diagrams of angiosperm shoot systems. The diagrams created by four students are described in these lists. Which of the following diagrams depicts the shoot method incorrectly?
Scientists use a dye to mark cells in a sapling’s lateral meristem in order to track their growth. After a few weeks, parts of the sapling are prepared and examined under a microscope. Which tissues will be stained the most by the dye injected into the lateral meristem?
A plant biologist examines plant tissue parts under a microscope. The biologist is only interested in basic tissues, so the slides aren’t numbered. Which of the following slides contains a basic tissue sample?
For a plant anatomy lesson, students are drawing diagrams of angiosperm reproductive systems. The diagrams created by four students are described in these lists. Which diagram best depicts the reproductive system?
Dendrochronology is the science of counting the annual rings in a tree trunk to determine its age. What tissue are scientists looking at when they use dendrochronology to determine the age of a tree?
Sugar transport: pressure flow hypothesis
Explanation: Just as the circulatory system transfers nutrients across human bodies, a plant’s vascular tissues carry nutrients throughout the plant. In humans, blood is the primary solvent for nutrients, while in plants, water is the primary solvent. Animals, on the other hand, use blood pressure to transport nutrients across their bodies, while plants depend on gravity and the unified properties of water to do so.
Explanation: Plants are unable to successfully transfer water to their individual cells. Capillary motion, on the other hand, causes water to flow upward toward gravity. When water is contained in a small space, such as the xylem of a plant, it forms intermolecular interactions with the chamber’s walls. Small amounts of water will “climb” the chamber walls as a result of these interactions. More water molecules obey the “climbing” adhesion molecules due to water’s cohesion, which attracts it to itself. This causes the adhering molecules to ascend higher, and the water finally reaches the plant’s topmost region due to the mutual interaction of adhesion and cohesion (the leaves). Water is then released from the stomata, increasing the water’s attraction to the low-pressure zone.
Hsc biology – movement of water in plants
Water is the most restricting abiotic (non-living) element for plant growth and productivity, as well as a major determinant of global vegetation distributions. Plants’ thirst for water has been known by humans since antiquity, as demonstrated by the presence of irrigation systems at the dawn of recorded history. Water plays a crucial role in plant growth and photosynthesis, as well as the distribution of organic and inorganic molecules. Plants retain less than 5% of the water absorbed by roots for cell expansion and plant development, despite this dependence. The remaining water evaporates immediately into the atmosphere by plants, a mechanism known as transpiration. Transpiration can waste a lot of water; a single irrigated corn plant in Kansas can use 200 liters of water in a single day, while some massive rainforest trees can use nearly 1200 liters!
Why would plants waste so much water if it is so necessary to their growth and survival? The answer to this question can be found in another crucial plant process: photosynthesis. Plants must absorb carbon dioxide (CO2) from the atmosphere through tiny pores in their leaves called stomata in order to make sugars (Figure 1). When stomata open, however, water is lost to the atmosphere at a rapid rate compared to the small amount of CO2 absorbed; on average, 400 water molecules are lost for every CO2 molecule obtained across plant species. The balance between transpiration and photosynthesis is essential for plants to exist; stomata must remain open in order to build sugars, but doing so risks dehydration.