AS Biology P1 MCQs Preparation Thread

[blabla]

Which disease is NOT likely to be passed directly from parent to child?
A. Cholera
B. HIV AIDS
C. malaria
D. Tuberculosis

The answer is malaria...but why cant it be cholera?

 

[Gémeaux]

View attachment 12769

Denitrifying bacteria best grows in poorly aerated soil, its a fact. and as D depends on de-nitrifying bacteria, this process is increased.

 

[Just M]

Aoa!
need help with some more questions plz...
View attachment 12766View attachment 12767View attachment 12768View attachment 12769

For part 1, the ans is D because during telophase, spindle will start to disintegrate.
Part 2, options 1 and 3 refers to cohesion-tension theory. So the remainings are the answer. So sorry i do not know how to explain option 2 and 4.
Part 3, only trachea and bronchus have cartilage. Respiratory bronchioles do not contain smooth muscle.
Part 4, in poorly drained areas, there will be less amount of O2 (contributes to anaerobic conditions), denitrying bacteria survives best in this condition. As a result, this will lead to an increase in denitrification process.
Hope it helps

 

[N.M]

y not 1?

View attachment 12753

i asked the same question at school
so 1 of my friends explained that in mitosis an individual cell is never repaired infact the whole tissue is repaired as new cells are made.
remeber this because examiners do trick us with these types of questions

 

[XPFMember]

For part 1, the ans is D because during telophase, spindle will start to disintegrate.
Part 2, options 1 and 3 refers to cohesion-tension theory. So the remainings are the answer. So sorry i do not know how to explain option 2 and 4.
Part 3, only trachea and bronchus have cartilage. Respiratory bronchioles do not contain smooth muscle.
Part 4, in poorly drained areas, there will be less amount of O2 (contributes to anaerobic conditions), denitrying bacteria survives best in this condition. As a result, this will lead to an increase in denitrification process.
Hope it helps

can u tell me what is respiratory bronchiole...and what is terminal?

 

[XPFMember]

thnx everyone...jazakAllah khairen

 

[Just M]

Which disease is NOT likely to be passed directly from parent to child?
A. Cholera
B. HIV AIDS
C. malaria
D. Tuberculosis

The answer is malaria...but why cant it be cholera?

Hi there. Cholera can be passed on to their children. This explanation may seem abit funny to you but it's true. Parents can prepared food for their children so there's a chance of contaminating the food

 

[geek101]

Which disease is NOT likely to be passed directly from parent to child?
A. Cholera
B. HIV AIDS
C. malaria
D. Tuberculosis

The answer is malaria...but why cant it be cholera?

cuz malaria needs a vector..unlike others
and cholera can pass in one house if the living conditions are poor....like no water to wash hands and make food and stuff

 

[Just M]

can u tell me what is respiratory bronchiole...and what is terminal?

Hope this helps and so you can relate the structure.

 

[XPFMember]

aoa

umm this one..

 

[XPFMember]

Hope this helps and so you can relate the structure.

thanks a lot!

 

[sophiaaa]

From all the sunlight arriving at the plant, a lot is wasted from transpiration, the light misses the leaf, the light passes through the leaf without getting absorbed by the chloroplasts etc... so only 1% of the sunlight is actually used in photosynthesis (this is a number you must know from studying ecosystems)
Also, we know that 10% of the energy in produces is actually useful to primary consumers. This is due to several reasons. For example, the cellulose in the plant's cell walls cannot be digested, so it just passes through the feces of the herbivore. A lot of energy is also wasted in respiration, and also in chewing the plant.
Secondary consumers are more efficient because more parts of the herbivore can be digested such as flesh and meat. However, there are still parts such as bones which cannot be digested. As a result, the efficiency in secondary consumers is higher than that in primary consumers. So the only option is 20%.
All the remaining energy (from cellulose, bones, organic waste) can be digested and used by microorganisms/detrivores/decomposers, so they get the remaining 80% of the energy.
wht m nt getting is.....in secondary consumer,10% of primary consumer is efficient...so it should be less than 10% in secondary consumer.isn't it?????

 

[Soldier313]

Can someone please help me with these?



^can someone please label each of the parts for me?


^why C and not B?

which component of tobacco smoke causes emphysema?


jazakallah

 

[sophiaaa]

as u add more substrate to the non competitive inhibition it remains the same rate not increasing

i guess the reaaction rate increases.since competitive inhibitor depends on the concn of substrate present......

 

[Soldier313]

aoa

umm this one..

View attachment 12772

B is obviously light intensity which is max at summer
C is producers which start increasing as light intensity increases
D is therefore the primary consumers which must lag behind producers
and A is the nutrients which decrease as producers use it up when they increase in number
Hope that helps!

 

[fathimaash]

aoa

umm this one..

View attachment 12772

da graphs A B C D r as follows
A- the quantity of nutrients
B- the light intensity
C- producers
D- primary consumers
so D is da answer

 

[XPFMember]

Soldier313

^why C and not B?
the compounds in plants would be i think proteins?

umm,,,they'll be converted to ammonium ions first...n then to nitrates...which plants will take,,,

nt sure

 

[blabla]

http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w07_qp_1.pdf

Question 40! Someone please help!! i think it was answered in the thread before but i cant find it!

 

[JulyMei]

Hi guys.. Thanks for those who helped me out in lots of questions!
Appreciate it!!
Gonna have Bio paper 1 tomorrow!!!
I'm gonna log off now and not gonna log in for next 24 hours.

Good Luck everyone!! God bless!!

 

[egy]

i guess the reaaction rate increases.since competitive inhibitor depends on the concn of substrate present......

i said non competitive inhibition