B3.2 Transport

What is the function of capillaries in the circulatory system?

• Transport blood away from the heart

• Provide exchange surface in tissues

• Store starch and other substances

• Absorb water and mineral ions from the soil

What is the main adaptation of arteries to withstand high pressure?

• Thick walls and narrow lumen

• Presence of valves

• Thin walls and wide lumen

• Contain collagen and elastic fibers

What is the primary function of veins in the circulatory system?

• Transport blood to the heart at high pressure

• Provide exchange surface in tissues

• Absorb water and mineral ions from the soil

• Transport blood to the heart at low pressure

What is the process by which tissue fluid is forced out of capillaries at high pressure?

• Active transport

• Osmosis

• Passive diffusion

• Pressure filtration

What is the main function of tissue fluid in the body?

• Exchange substances between cells and blood

• Store excess water in the body

• Provide support to leaves

• Transport oxygen to cells

What is the function of root pressure in plants?

• To regulate the temperature of the roots

• To store excess water in the roots

• To push water down from the leaves to the roots

• To pull water up the stem from the roots

What are the regions of plants known as 'sinks'?

• Photosynthetic cells and chloroplasts

• Meristems, roots, and young leaves

• Mature green leaves, green stems, and storage organs

• Seeds, fruits, and storage organs

What is the main function of sieve tube cells in phloem tissue?

• To store excess sugars

• To generate root pressure

• To regulate transpiration

• To transport organic compounds

How do companion cells aid in the translocation process in plants?

• By regulating the opening and closing of stomata

• By providing structural support to the stem

• By generating ATP for active transport of assimilates

• By storing excess water in the phloem

What creates the hydrostatic pressure gradient that drives translocation in plants?

• Unloading of sucrose at the sink regions

• Active transport of minerals into the roots

• Passive diffusion of water in the xylem

• Osmosis of water into the phloem