It has small grain size and has two good cleavages. It is extrusive.
The rock has high concentration of Potassium, Magnesium and Iron. It has paltry crystal which split into flakes. It has one perfect cleavage. The color ranges from dark brown to silver brown. It is extrusive.
The rock contains silicon. It is pale in color. The grain size is large. The rock has curvy fractures and has a very glassy lustre to it. The rock is intrusive.
(iii) The larger grains have a width of 2 to 3 mm. This suggests that the sample is from an intrusive rock.
(iv) The rock sample has large grains and is free from any organic traces suggesting it is intrusive. It is pale in color so it must be felsic. It produces effervescence and is almost white in color suggesting it contains feldspar or quartz. This rock was formed from slow cooling of magma under very high pressure.
(v) In my opinion this rock is most likely to be Granite with traces of alkali feldspar.
D (i) Let us call the plot treated with herbicides as Plot1 and the plot left unchanged as Plot2
The Null Hypothesis statement for the benefit of the study is:
The is no difference in the re-growth rate of the knot-weed in Plot1 and Plot2
(ii) It will be best to select smaller ares within the two plots since entire Plot1 has been treated with herbicides and should show similar results throughout.
(iii) It is recommended that the warden should sample at random so as to reduce any margin of error. For example there is a probability a particular section in Plot1 has higher concentration of herbicides.
(iv) Yes. Using a frame of 1m2 over 15 times will be sufficient if used at random as it would have covered a good portion of the plot.
Total area available per plot : 25m x 25m = 625 m2
Total area covered by the...
For example there is a probability a particular section in Plot1 has higher concentration of herbicides.
E (i) Coleoptile is a pointed protective sheath which grows towards the surface during germination. When the coleoptile has reached the surface it shops growing allowing flag leaves to penetrate its top. The coleoptiles function is to provide protection to the tender flag leave to the surface. It also has vertical water vessels to carry water throughout the germination process.
(ii) Magnification is different on different microscopes. To be certain that the reading are accurate a microscope must be calibrated before use. However, there is still a small scope of error after calibration is complete. A non calibrated microscope will profile incorrect data.
(iii) Toluidine blue stains the cell's wall it is applied to on the basis of organic composition of the subject. Applying Toluidine blue to coleoptile stains the epidermal and cortical cells making them visible under a microscope. When the cross section is used under the microscope, we can easily distinguish the epidermal and cortical cells of the coleoptile.
(iv) The study was conducted to find the changes found in the coleoptile exposed to gamma radiation.