From the evolutionary point of view, suggest an investigation of how rat evolve from carnivorous to omnivorous. by Kwok Wing Sam LAM https://padlet.com/skwlam/hkbuasg12biosbaQ3 Derive a test to verify your answer en-us 2018-11-20 01:54:01 UTC 2026-01-18 18:47:55 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Dootheets.png Main food constituent found in rat's diet nowadays skwlam https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306174658 show your working principle by video clipping]]> 2018-11-20 01:56:59 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306174658 Principle of experiment https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306921681 Carrying out iodine test in stomach tissue
-To determine whether an animal is herbivorous or ominivorus, we could test the presence of strach in the animal digestive system. 
-Starch is the storaged form of food in most plant, if the animal is omnivorous, it must intaked a starchy plant food.]]> 2018-11-22 06:58:59 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306921681 Group https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306922631 Test if protein is present in the digestive system of the rat. ]]> 2018-11-22 07:05:30 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306922631 Iodine test https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306922689
Positive result: The iodine solution turned from brown to blue black color, starch is present in the stomach tissue
Negative result: The iodine solution remained brown in color, starch is not present in the stomach tissue]]> 2018-11-22 07:05:47 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306922689 Conclusion https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306925138 Positive result is shown, which implies that the rat has taken in starchy plant food before. Its diet included the plant food, therefore it is a omnivore]]> 2018-11-22 07:20:42 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306925138 Diet of rats nowaday https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306927081
-Rats mainly feed on grains, starch, fruits and vegetables
-Food consumed mainly contain starch

]]> 2018-11-22 07:29:29 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306927081 Food test https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306927993 -Iodine solution is used to test whether starch is present
-Iodine solution will turn from brown to blue black with the presence of starch
-Iodine solution will remain brown with the absence of starch

]]> 2018-11-22 07:33:42 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306927993 Task2 https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306929684 Dissection of rat digestive system]]> 2018-11-22 07:40:24 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306929684 Results (starch is present) https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306930496 -Iodine solution turns to blue black, indicating starch is present]]> 2018-11-22 07:43:55 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306930496 Dissections https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306931436 2018-11-22 07:48:24 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306931436 Omnivorous https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306932376 -It means mouses consume everything. Both meat and plant
-Plants contain large amount of starch 
-If mouse is a omnivore, starch should be found]]> 2018-11-22 07:52:22 UTC https://padlet.com/skwlam/hkbuasg12biosbaQ3/wish/306932376