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- Consider a soil with the following properties: The water content at the permanent wilting point is 0 = 5 Vol.% The actual plant available water accounts for 3 Vol.% The water content at saturation is 0,-38 Vol.% The water content at a suction of 10 cm is 35 Vol.% a) What is the field capacity of your soil? State the calculation, not only the result. b) What matric potential (suction) values do you assume for the wilting point and field capacity of your soil?What is the compensation point? What is the implication of the compensation point for the plant growth?Acclimatization has been one of the major obstacles to the use of tissue culture in crop improvement. Explain why this process is necessary for the ex vivo survival of tissue culture derived plants.
- The following experiment was carreid out at ILC Laboratories to measure the effect of different nutrient solutions on bean root growth. Three nutrient solutions were made: 1.) A solution containing all required nutrients 2.) A solution containing all required nutrients except nitrogen; and 3.) distilled water. The results recorded for root length and leaf colour were as follows: Solution 1.) 47 mm; deep green Solution 2.) 17 mm; pale green-yellow Solution 3.) 14 mm; pale green-yellow a.) explain how the solution ranked in relation to the other two; b.) state the evidence that supports your answer; and c.) explain why the plant grew the way it didFor each of the following plant growth indices provide a definition, a formula and an explanation of the advantages and disadvantages of each for assessing plant growth:- Absolute growth rate- Relative growth rate - Net assimilation rate- Specific leaf areaC) If you have a sieve tube member next to a vessel element, and the solution in the sieve tube member has lots of sugar (Ys = -2.0 MPa) and positive pressure (4p 0.5 MPa), and . the solution in the xylem vessel is fairly dilute (Ys = -0.1 MPa), but it is under physical tension (Yp%3D-1.4MPa), which way will the water flow? a) from the sieve tube member into the vessel element b) from the vessel element into the sieve tube member c) neither direction. Th
- Classification of the different morphological characteristics according to crop productivity, adaptability and marketability of certain crops. Morphological Characteristics Plant Example Productivity Adaptability Marketability 1. large root 2. leaf/stem with trichomes 3. numerous petals 4. enlarged stem 5. numerous tillers 6. large/numerous pods 7. large leaf 8. overlapping petals/sepals 9. stem/root nodules 10. separate male/ female flowers 11. fibrous/extensive root system 12. brace roots 13. short internodes 14. waxy thick leaves 15. large flowers 16. long stalkHow can tissue culture techniques be used to study the effects of environmental factors, such as temperature, humidity, and light intensity, on the growth and development of plant cells and tissues, and how can this knowledge be applied to improve crop yields and plant resistance to abiotic stress?Give an example of an environmental condition where stomates are unable to maintaincooling of the leaf and heat stress occurs. Explain the consequences of heat stress onphotosynthesis, membrane integrity and proteins.
- Explain the mechanisms that regulate the ion xylem loading.Which of the following biofertilizer extends the root system's reach, allowing for enhanced water and nutrient absorption? Explain.a. Bio-N (Corn) [Azospirillum lipoferum and Azospirillum brasilense] b. Trichoderma [Trichoderma sp.]c. Mykovam [vesicular arbuscular mycorrhiza]List five main groups of natural plant growth regulators. Write a note ondiscovery, physiological functions and agricultural/horticultural applicationsof any one of them.