Starch Testing Lab Quiz PDF

Starch Testing Lab Quiz 1\. Why is it necessary to use a plant that has been in sunlight for several hours? a\) To warm up the leaf b\) To ensure photosynthesis has occurred c\) To make the leaf easier to handle d\) To reduce moisture content 2\. What is the primary purpose of boiling the leaf...

Starch Testing Lab Quiz 1\. Why is it necessary to use a plant that has been in sunlight for several hours? a\) To warm up the leaf b\) To ensure photosynthesis has occurred c\) To make the leaf easier to handle d\) To reduce moisture content 2\. What is the primary purpose of boiling the leaf in water? a\) To soften the leaf b\) To destroy cell membranes c\) To begin chlorophyll extraction d\) To heat the leaf evenly 3\. Why must safety spectacles be worn during this experiment? a\) To protect from chemical splashes b\) To see the color changes better c\) To prevent UV damage d\) To improve visibility 4\. What is the purpose of using alcohol in the experiment? a\) To sterilize the leaf b\) To extract chlorophyll c\) To test for starch d\) To clean the equipment 5\. Why is the alcohol tube placed in hot water rather than directly over flame? a\) To save energy b\) To heat more evenly c\) To prevent fire hazards d\) To maintain constant temperature 6\. What indicates successful chlorophyll extraction? a\) The leaf turns brown b\) The alcohol turns green c\) The water boils d\) The leaf floats 7\. Why is the leaf returned to hot water after alcohol treatment? a\) To remove remaining alcohol b\) To continue chlorophyll extraction c\) To prepare for iodine testing d\) To maintain temperature 8\. What is the purpose of the white tile? a\) To provide sterile surface b\) To observe color changes clearly c\) To absorb excess chemicals d\) To prevent contamination 9\. Why are exactly 10 drops of iodine solution specified? a\) To standardize the test b\) To prevent waste c\) To avoid oversaturation d\) To ensure safety 10\. What safety precaution is most critical when handling alcohol? a\) Wearing gloves b\) Using ventilation c\) Keeping away from flames d\) Limiting exposure time 11\. Why must the leaf be completely submerged in water during boiling? a\) To ensure even heating b\) To prevent burning c\) To maintain moisture d\) To facilitate membrane destruction 12\. What tool is recommended for leaf transfer? a\) Bare hands b\) Paper towel c\) Forceps or glass rod d\) Metal spoon 13\. What is the expected result if starch is present? a\) Green coloration b\) Blue-black coloration c\) Yellow coloration d\) No color change 14\. Why is minimal alcohol volume recommended? a\) To reduce costs b\) To minimize safety risks c\) To speed up the process d\) To improve results 15\. What alternative can be used instead of a Bunsen burner? a\) Microwave b\) Hotplate c\) Sun exposure d\) Chemical heating 16\. Why must iodine contact be avoided with skin? a\) It causes stains b\) It is harmful c\) It reduces effectiveness d\) It evaporates quickly 17\. What is the purpose of the insulating mat? a\) To prevent table damage b\) To maintain temperature c\) To absorb spills d\) To provide workspace 18\. Why must the chlorophyll be removed? a\) To see color changes clearly b\) To make leaf softer c\) To speed up reaction d\) To preserve the leaf 19\. What indicates the experiment is ready for iodine testing? a\) Leaf is transparent b\) Water is boiling c\) Alcohol is green d\) Leaf is dry 20\. What should be recorded during the experiment? a\) Room temperature b\) Time intervals c\) Leaf color changes d\) Water volume