Theory

CH7 - TRANSPORT IN PLANTS

Fig. 5.1 shows part of a transverse section of a leaf.(a) Explain, in terms of water potential, how water moves from Q to R..............................

2009 Summer

MCQ

CH7 - TRANSPORT IN PLANTS

Which plan diagram of a transverse section of a leaf correctly shows the position of xylem and phloem as well as the fact that the palisade mesophyll ...

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

The diagram shows the changes in pressure potential ($\Psi_p$), solute potential ($\Psi_s$) and water potential ($\Psi$) when a plasmolysed plant cell...

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

What is the sequence of events in the translocation of assimilates?

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

When stained, which features, visible under the light microscope, are part of the cells of the plant tissues listed in the table?[Table_1]

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

What is the sequence of events in the translocation of assimilates?

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

Which description states some of the features of xylem vessels?

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

The diagram shows the changes in pressure potential ($\Psi_p$), solute potential ($\Psi_s$), and water potential ($\Psi$) when a plasmolysed plant cel...

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

When stained, which features, visible under the light microscope, are part of the cells of the plant tissues listed in the table? [Table_1]

2009 Winter

Theory

CH7 - TRANSPORT IN PLANTS

(a) Explain what is meant by the term transpiration......................................................................................................

2009 Winter

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