Theory

CH13 - PHOTOSYNTHESIS

(a) A touch stimulus to an $M. pudica$ leaf causes an action potential to be generated. The action potential results in changes in cells, which cause ...

2024 Winter

3

Theory

CH13 - PHOTOSYNTHESIS

Stomata in leaves respond to changes in environmental conditions by opening and closing. This regulates carbon dioxide uptake and water loss.(a) Descr...

2024 Summer

3

Theory

CH13 - PHOTOSYNTHESIS

Photosynthesis is the energy transfer process that occurs in chloroplasts.Fig. 5.1 shows some biochemical events that occur in a chloroplast during th...

2024 Summer

5

Theory

CH13 - PHOTOSYNTHESIS

(a) Paper chromatography is a technique that can be used to separate and identify different chloroplast pigments.Describe how the results of paper chr...

2024 Winter

4

Theory

CH13 - PHOTOSYNTHESIS

(a) In plants, stomata open and close in response to changes in environmental conditions. Explain why stomata need to open and close according to envi...

2024 Summer

4

Theory

CH13 - PHOTOSYNTHESIS

(a) Experiments were carried out to determine the effect of light intensity on the rate of photosynthesis of a species of the unicellular prototist, C...

2024 Summer

1

Theory

CH13 - PHOTOSYNTHESIS

(a) A touch stimulus to an $M. \; pudica$ leaf causes an action potential to be generated.The action potential results in changes in cells, which caus...

2024 Winter

1

Theory

CH13 - PHOTOSYNTHESIS

(a) Table 1.1 describes some functions that occur in different parts of a chloroplast.Complete Table 1.1 by identifying the letter on Fig. 1.1 that is...

2023 Summer

3

Theory

CH13 - PHOTOSYNTHESIS

Oryza is a genus of grass plants that includes the rice, Oryza sativa, a food crop.(a) Farmers flood fields of rice because this encourages faster gro...

2023 Summer

3

Theory

CH13 - PHOTOSYNTHESIS

Chloroplasts carry out photosynthesis. Fig. 1.1 shows some structural features of a chloroplast and some processes that occur within it. (a) (i) I...

2023 Winter

3

Theory

CH4 - CELL MEMBRANES AND TRANSPORT

(a) Table 1.1 shows three of the processes by which substances in solution can move across cell membranes. It also lists five statements that may appl...

2022 Spring

2

Theory

CH5 - THE MITOTIC CELL CYCLE

(a) Fig. 2.1 shows a cell at one of the main stages of mitosis in the mitotic cell cycle.(i) Name the stage of mitosis shown in Fig. 2.1.................

2022 Spring

2

Theory

CH3 - ENZYMES

(a) Enzymes are polymers of amino acids. Complete Fig. 3.1 to show the general structure of an amino acid.[Image_1: Fig. 3.1][1](b) When bananas are p...

2022 Spring

2

Theory

CH10 - INFECTIOUS DISEASE

Tuberculosis (TB) is a major cause of ill health worldwide.(a) State the name of a bacterium that causes TB in humans....................................

2022 Spring

2

Theory

CH8 - TRANSPORT IN MAMMALS

Control of heartbeat is myogenic. This means the electrical activity controlling the rhythm of a regular heartbeat begins in the heart muscle itself.A...

2022 Spring

2

Theory

CH6 - NUCLEIC ACIDS AND PROTEIN SYNTHESIS

(a) (i) Identify structure E and structure F in Fig. 6.1. E .............................................................................................

2022 Spring

1

Theory

CH17 - SELECTION AND EVOLUTION

The European hedgehog, Erinaceus europaeus, is a small omnivorous mammal. Its body is covered in spines, which are usually brown. A rare variant, whic...

2022 Spring

2

Theory

CH15 - CONTROL AND CO-ORDINATION

Giant axonal neuropathy (GAN) is a rare autosomal recessive disease, which affects neurones.(a) Mitochondria can move freely within the axons of neuro...

2022 Spring

1

Theory

CH16 - INHERITED CHANGE

The red blood cells of people with sickle cell anaemia have reduced oxygen-carrying capacity.(a) Explain the relationship between the gene mutation th...

2022 Spring

2

Theory

CH16 - INHERITED CHANGE

(a) Meiosis is an important process that contributes to genetic variation in a population.Fig. 4.1 shows a pair of homologous chromosomes during proph...

2022 Spring

2