Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 2.4, Problem 1CS
Core Skill: Connections Look ahead to Figure 54.14. The plant life shown growing in part (b) of that figure is sparse because the soil is very acidic. If the pH of the soil were 5.0, what would the H+ concentration be?
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EXPERIMENT : GRAVIMETRIC ANALYSIS OF PHOSPHORUS IN PLANT FOOD
Aim: To determine the amount of phosphorus in a commercial plant food
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MAKE CONNECTIONS Note three ways the propertiesof water contribute to soil formation. See Concept 3.2.
Part F - How to determine transpiration rates by the whole plant method
Which of the following best explains why the plant in front of the fan lost more mass than the control plant in normal room conditions?
The leaves of the plant in front of the fan had the highest initial water potential and therefore lost the most water.
The control plant had lower initial water potential in the root area and therefore lost less water.
The control plant had a lower initial mass and so lost water at a decreased rate.
The fan rapidly moves water molecules away from the leaf surface, lowering the water potential.
Chapter 2 Solutions
Biology
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- cite your referencearrow_forward43. Two soil samples, A & B, at same soil moisture levels are placed in contact with each other. Water will more likely move from soil B to soil A if their osmotic potentials, expressed in kPa, are: O A=-30; B=-70 O A=-10; B=+10 O A=-60; B=-10 O A=-50; B=-100 OA=-20%; B=-20arrow_forwardJust need help answering this question.arrow_forward
- 1.1 Microbes in the soil could be beneficial to plants and one way to evaluate this is by determining the R/S ratio. Define the R/S ratio. 1.2 Both rhizospheric and root-free soils were collected from five (5) plants before (BT) and after (AT) treatment. Using the microbial biomass that appear in Table 1, the R/S ratios before (BT) and after (AT) can be determined. Use these values to determine the respective R/S ratios. Kindly show all workings. Microbial population Before Treatment (BT) Plants R/S Microbial population After Treatment (AT) R/S ratio ratio (BT) (AT) Rhizospheric Non- soil (CFU) Rhizospheric Non- rhizospheric soil (CFU) soil (CFU) rhizospheric soil (CFU) Typha sp. 764 168 988 186 Pistia sp. 286 86 386 112 Salvinia 397 132 528 166 sp. Lemna sp. 274 121 406 152 Eichhornia 443 140 648 196 sp.arrow_forward%OM pH EC Ca2+ Mg2+ K+ Na+ Al3+ H+ % dS/m cmolc/kg soil cmolc/kg soil cmolc/kg soil cmolc/kg soil cmolc/kg soil cmolc/kg soil 2.7% 7.6 4.5 19 13 10 3 1 4 Is this soil affected? If so, what type? - saline - sodic - not salt affected - saline-sodicarrow_forwardMalathion is an organophosphate pesticide that is used often in residential and commercial landscaping. A landscaping company came and applied the pesticide to a lawn and after a couple of days. An environmental science student sampled the soil and analyzed the pesticide content. The student found the soil concentration of malathion to be 6.26 ppm. Assume a soil organic content of 1.5%, a soil particle density of 2.0 mg/L, and a soil porosity of 45%. If it rains the next day and water mixes well with the soil, estimate the concentration of malathion in the soil water.arrow_forward
- Observation: I want to know what effect salt has on the growth of grass. So I measure out 3 equal-sized squares of grass out the back of the Green Building. The first square of lawn I water with 5 liters of pure water from a watering can every day. The second square of lawn I water with 5 liters of pure water with 2 grams of salt mixed in, every day. The third square of lawn I water with 5 liters of pure water with 4 grams of salt mixed in, every day. I measure the height of the grass after 14 days and note the following observations. The first square is green and 15 cm high. The second square is greeny-yellow and 6 cm high. The third square is yellowy-brown and looks dead and is only 2cm high. What could we infer about the effect salt has on the growth of grass?arrow_forwardPlease write clearlyarrow_forwardUnder controlled conditions, a transpiration experiment was conducted using two different plant species, A and B. Each plant species was exposed to a low-humidity environment and a high-humidity environment with all other conditions kept the same. The transpiration rate was measured over a period of one hour. The data was graphed as shown below. A B transpiration rate (pl/cm²min) с 0.2 0.18 0.16 0.14 0.12 0.1 A bar graph of the transpiration rates of two plants under different humidity conditions What is the independent variable in the experiment? D 0.08 0.06 0.04 0.02 low humidity 40% the type of soll each plant was grown in the amount of water lost the humidity the plants are grown in high humidity 80% the amount of water given to each plant Species A Species Barrow_forward
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