The CEC of a given soil horizon is determined by the relative amounts of different colloids in that soil and by the CEC of each of the colloids. O True O False
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- O False 14. Which of the following is a property of soil colloidal particles? O Flocculation O None of these O Plasticity O All of these O Adhesion and cohesion AC UVDD IO C en h GENUINGLEATHCSSoils & Erosion 1.Describe the relationship between soil particle size and important soil characteristics (i.e., drainage andaeration). 2.What soil horizons contain the most nutrients? Why? 3.Describe the various kinds of living organisms that make up the soil community & how they interacttogether. Briefly indicate the role(s) ofeach.19. A well-granulated soil structure has more total pore space and greater overall water holding capacity than one with poor granulation or one that has been compacted. O True O False OENUNG
- O Adhesion and cohesion 15. HYDRUS can help users to model movement of water in the soil. O True O FalseSoil characterisation could help to determine soil type and soil health. Relate cation exchange capacity (CEC) with soil health and explain the roles of clay and organic matter in contributing to CEC. (i) What would you recommend to improve soils with low CEC and high CEC? Name ONE (1) negative effect of low CEC and high CEC soils, respectively. (ii) (ii) Suggest a suitable soil type for rice, oil palm and durian, respectively.of this practice with respect to plant nutrition?3. WHAT IF? How would adding clay to loamy soil affectcapacity to exchange cations and retain water? Explain.
- Figure 1 shows the appirtu thot e studeote to estetall mals (inverette -5- (d) living in the soil. Funet Sod or lesttter Sleve Aleshat Figure 1. Apparatus for extracting small animals Outline EACH of the following functions in the apparatus Light bulb Alcohol Fungi and bacteria are found in forest soils. Explain the role of these crganisms in the cycling of nutrients in the forest. (c)Test Content Question 1 Which factors affect soil quality? A all of these B history of the soil © presence of living organisms and topography chemical composition Question 2 What is the outermost covering of a fruit? A mesocarp B) endocarp (c) pericarp D exocarp Question 3 What occurs when stomata open? A Water vapor is lost to the external environment, increasing the rate of transpiration. B Water vapor is lost to the external environment, decreasing the rate of transpiration. C Water vapor enters the spaces in the mesophyll, increasing the rate of transpiration. Water vapor enters the spaces in the mesophyll, decreasing the rate of transpiration.Length of Root T Ang lira 12/8/0) ssoW Growth of Wheat Root Tips 3. Biologists investigated the effect of the presence of aluminum ions on root tips of a variety of wheat. They removed 2-mm sections of the tips of roots. Half of the root tips were placed in a nutrient solution with aluminum ions, while the other half were placed in an identical nutrient solution without aluminum ions. The length of the root tips, in millimeters, was measured every hour for seven hours. The results are shown in the data table below. Data Table Length of Root Tipe in Solution With Aluminum Length of Root Tips in Solution Without Aluminum (n) (uu) suoj (wu) suol 2.0 O= Root lips in 2.1 2.2 2.4 2.8 unujune suo 2.4 2.6 2.7 uognyos u nounm 5 3.2 2.8 3.7 unurunje SUo 2.8 6'E () aun Using the information in the grid, following the directions below. data table, construct a line graph on d. Describe the effect of aluminum ions on the growth of the root tips of wheat. a. Mark an appropriate scale on each axis. b.…
- aves to roots 113 Which ONE of the following is not the force responsible for the upward movement of water in a plant? A Capillarity B Transpiration pull C Diffusion D Root pressure 114 Below is a list of factors: 0 Temperature OLight intensity (Sun (v) Humidity Which of the following combinations of factors affect the ale of transpiration? A Qand (vi) anly Band () only C () (and (iv) only DO0and (v) (4x2Q-12. Complete the table:- Things directly related to Soil Things indirectly related to SoilTreatment Control Soil warming Soil warming x Year * 1.0 Year * 0.5 Active Layer Seasonal N mineralization (g N/ m²/ year)
