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