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