• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

A level Biology: Post your doubts here!

Messages
537
Reaction score
358
Points
73
All energy made in the ecosystem comes from photosynthesis. The energy that the plant lost, kept, used, etc. ALL originally came from its photosynthesis. Therefore:
Energy from photosynthesis: 27,000 + 3000 = 30,000
Energy from Sun = 1,000,000
Percentage = 30,000/1,000,000*100%=3%
nice ty ;)
 
Messages
924
Reaction score
1,096
Points
153
I'm not sure, but for the airways to be constricted, smooth muscles have to contract. So they're more active. Also, activity of cilia should be less I think, because they become paralysed when one smokes I think due to mucus. I'm not sure why goblet cells would wanna do endocytosis, my guess is that they need to take in more materials now than before in order to be able to produce mucus. So I'd go for C but again I'm not sure.
 
Messages
85
Reaction score
135
Points
43
i go for B as during asthma attacks more mucus is produced cuz some foriegn substance actually entered which triggered the asthma attack so choice 2 is now eliminated as exocytosis will increase not endocytosis and as 2 is eliminated the ans should be B the cilia will be more active as it will try to remove the excess mucus produced
what is the answer by the way:)
 
Messages
924
Reaction score
1,096
Points
153
i go for B as during asthma attacks more mucus is produced cuz some foriegn substance actually entered which triggered the asthma attack so choice 2 is now eliminated as exocytosis will increase not endocytosis and as 2 is eliminated the ans should be B the cilia will be more active as it will try to remove the excess mucus produced
what is the answer by the way:)
Your reasoning is good I change my mind lol
 
Messages
2,538
Reaction score
17,571
Points
523
i go for B as during asthma attacks more mucus is produced cuz some foriegn substance actually entered which triggered the asthma attack so choice 2 is now eliminated as exocytosis will increase not endocytosis and as 2 is eliminated the ans should be B the cilia will be more active as it will try to remove the excess mucus produced
what is the answer by the way:)
is the answer C?
I'm not sure, but for the airways to be constricted, smooth muscles have to contract. So they're more active. Also, activity of cilia should be less I think, because they become paralysed when one smokes I think due to mucus. I'm not sure why goblet cells would wanna do endocytosis, my guess is that they need to take in more materials now than before in order to be able to produce mucus. So I'd go for C but again I'm not sure.

Answer is B (checked the markscheme) and salma_69 is right exocytosis will increase nt endo
 
Top