An organism changes its diet as the season turns from summer (mainly ingesting a
ID: 278415 • Letter: A
Question
An organism changes its diet as the season turns from summer (mainly ingesting animal-based food) to winter (mainly ingesting plant-based food). What might be a consequence to the length of its digestive tract?
Question options:
A)
The digestive tract will decrease in length
B)
The digestive tract will not change in length, but the retention time will decrease
C)
The digestive tract will increase in length
D)
The digestive tract will not change in length, but retention time will increase
You supply a 5 gram wood mouse with 2,269 kJ of energy. The mouse excretes 2 g of waste (with 10 kJ/g) and spends 10 kJ/g/h while resting in its burrow for 20 hours. The mouse spends 100 kJ/g/h when moving to and from its meals (2 hours round trip). How much energy does the mouse assimilate?
Answer:
How does respiration rate in plants change as they get larger (assume log-transformed data)?
Question options:
A)
Total respiration increases with a slope = 0.75 as mass increases
B)
Total respiration increases with a slope = 0.67 as mass increases
C)
Total respiration decreases with a slope = -0.21 as mass increases
D)
Total respiration increases proportionally (slope = 1) as mass increases
A)
The digestive tract will decrease in length
B)
The digestive tract will not change in length, but the retention time will decrease
C)
The digestive tract will increase in length
D)
The digestive tract will not change in length, but retention time will increase
Explanation / Answer
First Question:
The answer will be the digestive tract will increase in length (Option C).
Explanation: Phenotypic plasticity is advantageous for organism living in a variable condition. Digestive tract show phenotypic plasticity & changes in response of diet change. Protein rich food (animal based food) is easily digestible compare to fibre rich food (plant based food). Thus plant based food will require longer retention time to absorb nutrients. Thus guts will become longer as it will provide more surface area & longer retention time to absorb nutrients.
Second Question:
Mouse excretes 2 g of waste at 10 kJ/g. Therefore (10 x 2) or 20 kJ/g energy is lost through excretion.
It spends 10 kJ/g/h during resting in its burrow for 20 hours.
Therefore, energy loss during resting= (10 x 5 x 20) kJ (As the weight of mouse is 5 g & resting period is 20 h)
= 1000 kJ
Mouse spends 100 kJ/g/h during 2 hours round trip.
Therefore, energy loss during moving= (100 x 5 x 2) kJ = 1000 kJ
Therefore, total energy loss = (20 + 1000 1000) kJ = 2020 kJ
Therefore, energy assimilates = (2269 - 2020) kJ = 249 kJ
Third Question:
The answer will be total respiration increases proportionally (slope = 1) as mass increases (Option D).
Explanation: Option A is for animals. Option C & D are wrong.
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