Biol349 Quizziz 2 of 2023

My favourite food is.....

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All of the following maintain the integrity of cell membranes in the dry state except:

• Flavinols

• Expansin

• Amphipathic molecules

• Dehydrin

• LEAs

Phase III of imbibition is also known as the lag phase.

• True

• False

The first enzyme to work on starch during carbohydrate mobilisation is:

• β-amylase

• α-glucosidase

• α-starchase

• α-amylase

• debranching enzymes

Draw a section through a bean seed and label the testa, endosperm and embryo.

Cryostorage can be done by placing seeds in _____ ____ at -196 °C.

Physical dormancy of seeds can be broken by:

• chemical scarification

• leaching of germination inhibitors

• application with gibberellic acid

• waiting for embryos to fully develop

• after-ripening

The pathway through which phloem contents travel through plasmodesmata is called the....

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Which one of the following is not a good storage practice for dry orthodox seeds?

• ideally 5-10% seed moisture content

• low storage temperature

• a dry storage environment

• high relative humidity

• good quality seeds at harvest

Choose all the true statements.

• During the mobilisation of lipids, the glyoxylate cycle produces malate and succinate.

• Raffinose and stachyose are proteins that aid in stabilising membrane structure during seed maturation.

• Recalcitrant seeds are desiccation sensitive.

• Conditioned seed storage is where temperature and humidity are not controlled.

• Decreased turgor causes displacement of cell wall polymers during loosening.