B2 Past paper questions

Created by: Zolo
Created on: 20-12-12 14:43

What is the equation for photosynthesis?

Carbon dioxide + water -> glucose+ oxygen

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The optimum temp of a greenhouse growing lettuce as quickly and cheaply as possible is 21'C why is this?

At a higher temp the photosynthesis enzymes will denature, at this temp it is the fastest rate so the heating lost is least for max photosynthesis

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Which is a larger woodland? Spruce or fir?

Spruce woodland

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Energy is obtained by both aerobic and aerobic respiration during exercise give three differences?

-anaerobic respiration turns glucose into lactic acid, - aerobic respiration turns glucose + oxygen into water + carbon dioxide, -anaeorbic respiration leads to oxygen debt

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Explain the advantage of the change of heart rate during exercise.

Moves blood around faster to provide more oxygen and glucose to the muscles, and remove carbon dioxide and water rapidly. And fast removal of lactic acid.

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Why can stem cells be used to treat paralysis?

Stem cells can be made to differentiate unspecified cells, they can replace dead or damaged cells. Can turn into nerve/muscle cells

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What is the difference between mitosis and meiosis?

1) meiosis is the production of gametes (sex cells) mitosis replaces dead or damaged cells. 2) mitosis clones cell information producing 2 cells whereas meiosis clones cells and splits once then twice into 2 hapliods

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Compare the issues involved in the use of embryo screenng for cystic fibrosis and for polydactyly.

Cf - reduces number of people with Cf, reducing healthcare costs but possible damage/risk to embryo and risk to mother. Polydactyl - cures a disfigurment but the condition isnt life threatening so the risk to the mother and foetus aren't so justified

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Other cards in this set

Card 2

Front

The optimum temp of a greenhouse growing lettuce as quickly and cheaply as possible is 21'C why is this?

Back

At a higher temp the photosynthesis enzymes will denature, at this temp it is the fastest rate so the heating lost is least for max photosynthesis

Card 3

Front

Which is a larger woodland? Spruce or fir?

Back

Card 4

Front

Energy is obtained by both aerobic and aerobic respiration during exercise give three differences?

Back

Card 5

Front

Explain the advantage of the change of heart rate during exercise.

Back

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B2 Past paper questions