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- A student investigated the effect of plant growth substances (IAA and GA) on the elongation of pea stems, the students marked a 10mm length of stem on each of four plants and applied growth substances to the stem. Figure 2 shows a graph of the student's results. 16- 14- 12- 10 10 20 40 IAA and GA 'IAA GA control 30 Time (h) a) Describe the effects on growth of the stem for the 2 growth substances applied separately. (4) 50 60discuss the following methods of plant propagation. i. Grafting ii. Layering iii. Marcotting iv. BuddingThe 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 did
- To investigate the function of the root system, four set-ups will also be prepared. Test tubes 1-3 will be filled with water to about three-fourths full, while only about 5-10 drops of water should be added into tube 4. Three fresh plants with intact roots and rid of the soil, will be placed into test tubes 2, 3 and 4. Roots should be completely immersed in water in tubes 2 and 3 while the root of the plant in tube 4 should not be in contact with (well above) the water. This will establish the setups which are: (a.) plant-free control, (b.) plant immersed in pure distilled water, (c.) plant immersed in distilled water-food color mixture, (d.) un-immersed plant. A few drops of oil should be added in all tubes to form a lipid layer on top of the water column on each set up. The set-ups should sit undisturbed at room temperature for two days. After 2 days, the water level will be observed as well as the condition of the plants in all the test tubes.Interpret the result obtained from each…The data that is attached below was collected during a lettuce seed ecotoxicity assay. Lettuce seed assays are used to compare the ecotoxicity of methanol, ethanol, and isopropanol by these alcohols' effects on germination rate and root elongination. Using the attached data, help answer which alcohol seems to be the most toxic to lettuce seeds. Why or why not would your results be expected? What does this information tell you about using ecotoxicity data to estimate human toxicity?Describe the structural modifications and specialized functions performed by the different modified roots observed. Do this by completing the table below. Name of specimen Description of modified root Special function 1. beet 2. radish 3. sweet potato 4. corn 5. mangroove 6. succulent 7. balete
- Show the sequence of secondary growth by drawing the row of cells from the boxed area below and labeling the vascular cambium cell (V), 5 xylem cells from oldest (X1) to youngest (X5), and 3 phloem cells (P1 to P3). Show what happens after growth continues by drawing and labeling a row with twice as many xylem and phloem cells. How does the vascular cambium’s location change? A pear has a hard texture but juicy. State two cells that give the characteristics? State the function of the transitional epithelium found in the mammalian urinogenital system. (i) Identify type of tissue lines the air sacs of the lungs. (ii) Explain how the tissue named in (i) adapted to its function.Below is a series of pictures of the stem (x.s.) of a sunflower, Helianthus sp. Note that it shows both a young stem and older stem. young 100x (.s.) older 100x (x.s.) Make a sketch of both ages and upload it here with the following structures labeled: epidermis, cortex, pith, vascular bundles, fibers, primary xylem, primary phloem, tracheids, vessel elements, collenchymaBelow is a series of pictures of the stem (x.s.) of a corn, Zea mays. 40x (x.s.) 100x (x.s.) Make a sketch of both magnifications (40x and 100x) and upload it here with the following structures labeled: epidermis, sclerenchyma (fibers), ground tissue parenchyma, vascular bundles, phloem, xylem, sieve tube members, companion cells, vessel elements, tracheids
- A team of researchers investigated the effects of phosphorous availability and light intensity on an angiosperm species. Seeds of the angiosperm were divided into four equal groups. Groups 1 and 2 were exposed to 200 μmol, and Groups 3 and 4 were exposed to 500 μmol. Groups 2 and 4 also received a phosphorous (P) solution. After 20 days, all plants were weighed, and the average dry weight of each group was calculated. The results are in the table below. Group 1(200 μmol, no P) Group 2(200 μmol, + P) Group 3 (500 μmol, no P) Group 4 (500 μmol + P) Average Dry weight (g) 0.8 1.1 1.5 6.2 Describe the effects of light and phosphorous on the growth of the plants in this study. Explain how the metabolic processes associated with the plant kingdom likely influenced these results.Below is a series of pictures of a leaf (x.s.) from a eudicot, Syringa vulgaris. 40x (x.s.) Make a sketch of the 40x leaf cross section and upload it here with the following structures labeled: upper epidermis, cuticle, stomata, guard cells, mesophyll (palisade and spongy), veins (xylem and phloem), bundle sheath, collenchyma cells, lower epidermis MacBook ProResearchers studying plant growth designed an experiment to test the effect of caffeine on the growth of onion roots. They hypothesized that caffeine-a stimulant-would increase the rate of root growth. They immersed the bottom of a group of onion bulbs in a solution of 1 mM caffeine and that of the other group of onion bulbs in distilled water. Then they measured the root length of both treated or experimental and untreated or control groups of onion bulbs. This was repeated for a total of five trials. The results from their experiments are illus- trated in the table below. Trial Using the data set above, Root Length (in mm) Control Group 18 19 25 17 1 2 3 4 5 19 Data table showing onion root length of control and experimental groups Experimental Group 18 15 12 13 14 (a) Construct a graph based on the type of data collected during the experiment (b) What is the mean for the control and experimental conditions in this experiment? (c) Identify if there is a significant difference between…