A) plants cannot lose water through their leaves B) photosynthesis occurs only in the roots C) all plant cells are unable to absorb substances directly from the environment D) mineral salts are produced in the leaves
A) the soil solution contains more solutes than the cell sap B) the water potential of the cell sap is lower than that of the soil solution C) water is actively pumped into the root hair D) the water potential of the cell sap is higher than that of the soil solution
A) Translocation B) Transpiration C) Osmosis D) Active transport
A) osmosis B) active transport C) transpiration D) cohesion
A) Large surface area B) Thick waxy cuticle C) Absence of a cell membrane D) Small vacuole
A) Soil ---> cortex ---> root hair ---> endodermis ---> xylem B) Soil ---> root hair ---> phloem ---> cortex ---> xylem C) Soil ---> root hair ---> cortex ---> endodermis ---> xylem D) Soil ---> epidermis ---> phloem ---> endodermis ---> xylem
A) cambium B) phloem C) epidermis D) xylem
A) Glucose and fatty acids B) Sucrose and amino acids C) Starch and proteins D) Water and mineral salts
A) transpiration pull B) atmospheric pressure C) root pressure D) active transport by xylem cells
A) movement of water through the xylem B) loss of liquid water from the roots C) loss of water vapour from the aerial parts of a plant D) absorption of water from the soil by roots
A) veins B) cuticle C) lenticels D) stomata
A) High humidity, low temperature and darkness B) High temperature, low humidity and strong wind C) Low temperature, high humidity and strong wind D) Low temperature, high humidity and weak wind
A) causes the xylem vessels to close B) increases the concentration of water vapour inside the leaf C) increases the temperature of the leaf D) reduces the water-vapour concentration gradient between the leaf and atmosphere
A) increases the water potential of the leaf B) removes the layer of humid air surrounding the leaf C) reduces the surface area of the leaf D) closes all the stomata permanently
A) Number of stomata B) Atmospheric humidity C) Thickness of the cuticle D) Leaf area
A) Atmospheric humidity B) Temperature C) Number and distribution of stomata D) Wind speed
A) its root hairs stop absorbing water completely B) its leaves immediately lose their cuticle C) its xylem vessels become blocked D) its stomata tend to close
A) All three types occur only through stomata B) Stomatal occurs through lenticels, cuticular through stomata and lenticular through roots C) Stomatal occurs through roots, cuticular through xylem and lenticular through phloem D) Stomatal occurs through stomata, cuticular through the cuticle and lenticular through lenticels
A) measure the amount of water produced during photosynthesis B) estimate the rate of transpiration by measuring water uptake C) measure the amount of food transported through the phloem D) determine the concentration of mineral salts in the soil
A) wind speed B) rate of water uptake C) distance between the plant and fan D) size of the leafy shoot
A) 3 cm/min B) 18 cm/min C) 2 cm/min D) 6 cm/min
A) To increase the rate of photosynthesis B) To prevent air entering and blocking the xylem C) To prevent water entering the shoot D) To remove mineral salts from the xylem
A) Ensure the apparatus is airtight B) Allow air bubbles to remain in the xylem C) Leave the joints loosely connected D) Remove all the leaves from the shoot
A) measures only water absorbed by the roots B) measures only the amount of water lost through the cuticle C) measures the amount of water stored in the leaves D) measures water uptake, which is used as an estimate of water loss
A) It creates a transpiration pull that assists water movement through the plant B) It prevents all water loss from the plant C) It prevents cooling of the leaves D) It stops mineral salts from entering the roots
A) wilting because water loss exceeds water absorption B) increased water content of the leaves C) increased turgidity of all cells D) permanent closure of the xylem vessels
A) evaporation of water from leaves creates a pull on the continuous water column B) transpiration produces water in the leaves C) water vapour is actively pumped into the xylem D) stomata push water downwards into the roots
A) water through the stomata into the atmosphere B) oxygen through the intercellular spaces of the leaf C) manufactured food through the phloem from source to sink D) water and mineral salts through the xylem from roots to leaves
A) xylem vessels actively pump sucrose into the phloem B) water evaporates from the phloem and pulls sucrose towards the roots C) sugars move only by diffusion from the roots to the leaves D) loading of sugars at the source causes water to enter the phloem, creating pressure that drives sap towards the sink
A) water is transported through the phloem B) mineral salts are transported through the phloem C) manufactured food is transported through the phloem D) manufactured food is transported through the xylem |