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