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