A-Level生物考试真题资料-成都A-Level培训

A-Level生物考试如何备考?很多考生喜欢利用真题刷题，这的确是A-Level生物备考中需要经历的过程，那么A-Level生物真题长什么样呢?A-level生物资料哪家更好些?下面新航道小编就为大家详细介绍下相关内容。

一、A-level生物考试真题范例

Instructions

• Use black ink or ballpoint pen.

• Fill in the boxes at the top of this page with your name, centre number and learner registration number.

• Answer all questions.

• Answer the questions in the spaces provided – there may be more space than you need.

• Show all your working in calculations and include units where appropriate.

Information

• The total mark for this paper is 50.

• The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question. Advice

• Read each question carefully before you start to answer it.

• Try to answer every question. • Check your answers if you have time at the end.

Answer ALL questions.

1. The photograph shows an aquatic plant, Elodea canadensis.

These plants were originally from North America but are now found in Europe, South America, Asia, Australasia and parts of Africa. They live in ponds, lakes and slowflowing rivers.

If the stem of the plant is cut underwater, bubbles of oxygen gas are released from the cut end of the stem as the plant photosynthesises.

(a) Describe an experiment to investigate the effect of different wavelengths of light on the rate of photosynthesis in Elodea canadensis.

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(b) Explain how the features of the grana in a chloroplast enable photosynthesis to occur.

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2.Information about depth and rate of breathing in humans can be obtained using a spirometer.

A student investigated the effect of exercise on breathing rate and respiratory minute ventilation.

The diagram shows a spirometer trace for a person resting quietly.

(a) (i) Calculate the mean breathing rate for this person.

(ii) Estimate the mean respiratory minute ventilation for this person.

(iii) During exercise, respiratory minute ventilation increases.

Explain why it is necessary for the respiratory minute ventilation to increase during exercise.

(b) (i) State one abiotic and one biotic variable that could affect this investigation.

Abiotic variable

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Biotic variable

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(ii) Choose one of the variables you have identified in (b)(i). Describe how this variable could be controlled and the effect it could have on the results if it is not controlled.

Variable ..........................................................................................................................................................

Describe how this variable is controlled.

Describe the effect it could have on the results if it is not controlled.

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Marram grass, Ammophila arenaria, is a plant found on coastal sand dunes in Europe and North Africa.

The plant is well adapted for living on sand dunes. The leaves can grow to over one metre in length.

The photograph shows marram grass growing on sand dunes.

二、A-level生物考试资料

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