Theory

CH13 - PHOTOSYNTHESIS

(a) Fig. 8.1 shows a scanning electron micrograph of a section through a leaf of the Christmas rose, *Helleborus niger*.[Image_1: Fig. 8.1]Name M and ...

2009 Summer

Theory

CH13 - PHOTOSYNTHESIS

(a) Fig. 8.1 shows the results from two experiments carried out to investigate the effect of light intensity and carbon dioxide concentration on the r...

2009 Winter

Theory

CH13 - PHOTOSYNTHESIS

(a) In Queensland, Australia, the effect of the water-holding capacity of soil on the yield of sorghum and wheat was investigated.• Four test plots ...

2009 Winter

Theory

CH13 - PHOTOSYNTHESIS

(a) In the majority of plants the leaf is the main photosynthetic organ. List four ways in which the structure of a dicotyledonous leaf is adapted for...

2009 Winter

Theory

CH13 - PHOTOSYNTHESIS

Fig. 4.1 is a photomicrograph of a transverse section through the leaf of a C4 plant.(a) (i) Identify structures J to L. J ..............................

2010 Summer

Theory

CH13 - PHOTOSYNTHESIS

(a) Explain how the palisade mesophyll cells of a leaf are adapted for photosynthesis. [8](b) Outline the light-independent stage of photosynthesis. [...

2010 Summer

Theory

CH13 - PHOTOSYNTHESIS

Cereal crops, such as sorghum and rice, are a major source of nutrients all over the world.(a) Explain why cereal crops are important components of ma...

2010 Summer

Theory

CH13 - PHOTOSYNTHESIS

(a) Describe the structure of photosystems and explain how a photosystem functions in cyclic photophosphorylation. [8] (b) Explain briefly how reduced...

2010 Summer

Theory

CH13 - PHOTOSYNTHESIS

Cereal crops, such as sorghum and rice, are a major source of nutrients all over the world.(a) Explain why cereal crops are important components of ma...

2010 Summer

Theory

CH13 - PHOTOSYNTHESIS

(a) Describe the structure of photosystems and explain how a photosystem functions in cyclic photophosphorylation. [8](b) Explain briefly how reduced ...

2010 Summer

Theory

CH7 - TRANSPORT IN PLANTS

(a) The structure of a phloem sieve tube element is adapted to its function.Each of explanations A to F describes how a particular structural feature ...

2020 Spring

Theory

CH3 - ENZYMES

Phosphatidate phosphatase (PAP) enzymes have an important role in lipid metabolism.The reaction catalysed by PAP is shown in Fig. 2.1.Experiments were...

2020 Spring

Theory

CH8 - TRANSPORT IN MAMMALS

During one cardiac cycle:blood enters the heart from the lungs and from the rest of the bodyblood leaves the heart to be transported to the lungs and ...

2020 Spring

Theory

CH9 - GAS EXCHANGE AND SMOKING

(a) When a section of lung tissue is viewed using a light microscope, it is possible to identify the trachea, the bronchus, the bronchioles and the al...

2020 Spring

Theory

CH11 - IMMUNITY

Myasthenia gravis and HIV/AIDS both involve disorders of the immune system.(a) Outline why myasthenia gravis is described as a disorder of the immune ...

2020 Spring

Theory

CH1 - CELL STRUCTURE

Fig. 6.1 is a transmission electron micrograph of a plant parenchyma cell.(a) The external environment of the parenchyma cell has a higher water poten...

2020 Spring

Theory

CH14 - HOMEOSTASIS

(a) Fig. 1.1 represents part of the wall of a proximal convoluted tubule (pct) in a kidney nephron.[Image_1: Fig. 1.1](i) Name the features of the wal...

2020 Spring

Theory

CH11 - IMMUNITY

Severe combined immunodeficiency (SCID) is a group of life-threatening diseases. SCID is caused by mutations that prevent the normal function of the i...

2020 Spring

Theory

CH16 - INHERITED CHANGE

Flowers of the common morning-glory plant, Ipomoea purpurea, can have several different phenotypes. An example of these flowers is shown in Fig. 3.1.[...

2020 Spring

Theory

CH16 - INHERITED CHANGE

The rainbow trout, Oncorhynchus mykiss, is a fish that is bred in commercial fish farms. Rainbow trout that have a blue-silver colour are sold at a hi...

2020 Spring