Translocation in Plant Transport Systems

What is the primary function of the phloem in plants?

• To transport water and minerals from roots to leaves

• To transport assimilates from source to sink

• To provide structural support

• To facilitate photosynthesis

Which of the following best describes a 'source' in the context of phloem transport?

• A part of the plant where water is absorbed

• A part of the plant where assimilates are produced or stored

• A part of the plant where photosynthesis does not occur

• A part of the plant where nutrients are lost

What is meant by the term 'sink' in plant physiology?

• A region where water is stored

• A region where assimilates are consumed or stored

• A region where light is absorbed

• A region where oxygen is released

Which of the following processes is responsible for the movement of assimilates in the phloem?

• Transpiration

• Translocation

• Respiration

• Photosynthesis

In which direction does translocation occur in the phloem?

• Only upwards

• Only downwards

• Both upwards and downwards

• Only sideways

Which of the following is NOT typically considered an assimilate transported by the phloem?

• Sucrose

• Amino acids

• Water

• Hormones

What is the main driving force for the movement of assimilates in the phloem?

• Gravity

• Pressure gradient

• Temperature gradient

• Light intensity

Which part of the plant is most likely to act as a source during the growing season?

• Roots

• Mature leaves

• Flowers

• Seeds

Which of the following statements about phloem loading is true?

• It occurs only at night

• It requires energy in the form of ATP

• It is a passive process

• It occurs only in the roots

What is the role of companion cells in the phloem?

• To store water

• To provide energy for translocation

• To facilitate gas exchange

• To absorb nutrients from the soil