Biology F5 C4 & C5 part 1
State one importance of transpiration to plant.
-Helps plant to absorb water and mineral salts from___
-Gives___effect to the plant
-Removes excessive___from the plant
soil, cooling, water
It was found that the air bubbles had moved 4 cm in 5 minutes. By using the formula [ Distance travel by air bubbles (cm) / Time (min) ], calculate the rate of transpiration of the plant.
0.8 cm/min
State why water lettuce plant is suitable to be used for the treatment of waste water ?
-Faster ____rate
-The plant is able to accumulate____at a fast rate.
growth, heavy metals
Explain the method used to treat waste water in waste water plant.
-_____method
-Use_____plant
-Has a fast__rate
-Can absorb heavy metals from the waste water
-___/ nitrate
phytoremediation, water lettuce, growth, phosphate
State one importance of companian cell found in the structure of phloem.
-Contain___which provides energy for___of sucrose from the leaf to the__tube via___transport
mitochondria, transportation, sieve, active
Explain why aphid insect absorbs nutrient from sieve tube.
-Sieve tube transports___substances from the leaves to all parts of the plant
-Through____process
organic, translocation
Predict the effect to the growth of plant if sieve tube is damaged which caused by aphid insect.
-Stunted growth
-Organic compounds which are synthesised by the ___ cannot be transport to other parts of the plant.
leaves
After 3 days, white rose--->blue rose. Explain the results observed after three days.
-White petals of the rose turned to ___.
-___tissue
-Long and arranged___from end-to-end
-Forms a___tube system
-Transports water and mineral salts from the root to all parts of the plant
-Aided by___action and___pull
blue, xylem, longitudinally, continuous, capillary, transpirational
Explain the effect towards plants that do not undergo guttation process.
-Effective___cannot be maintained
-Water absorption by___is disrupted
-Plant__substances cannot be eliminated
-The leaf___pressure becomes high
-Causes the leaf vein to___
-The leaves is exposed to___and eventually fall
root pressure, root hair cells, waste, vein, brust, pathogen
Explain how water hyacinth plant can be used to treat ammonia content in the lake.
-Via___
-Water hyacinth has___roots
-Has many root hairs
-Able to accumulate ammonia
-Has high___rate
-Which ables it to absorb a large amount of ammonia
phytoremediation, long, growth
Discuss the advantage and disadvantage of using water hyacinth plant for the treatment of the pollution.
Advantage :
-Does not involve expensive__
-No need to buy__equipment
-Does not involve any use of____
-Environmentally friendly
-Heavy metals is___removed from water
-The plant is suitable to be used in___habitat
-Suitable to treat water___
cost, modern, chemicals, permanently, watery, pollution
Discuss the advantage and disadvantage of using water hyacinth plant for the treatment of the pollution.
Disadvantage:
-Consume a lot of time to__the water pollution
-Heavy metals can enter the food___if there are organisms that feed on(ate) the plants
recover, chain
Explain the characteristics of xylem that enables xylem to carry out its functions effectively.
-Consists of__cells
-No____
-to allow the flow of water easily
-Arranged___from end to end
-Ensure___water movement
-Have___thickening
-to give strenght to xylem and prevent from___
-to prevent the plant from being___
dead, cytoplasm, longitudinally, continuous, lignin, collapsing, bent
Explain the factors involved in the passage of water from soil to the leaves.
-____pull
-Water___from stoma pulls water from the leaves
-____action
-Produce from___force (between water molecules and the wall of xylem vessels)
-___force (between water molecule and water molecule)
-____pressure
-Water moves from the soil into the xylem vessels by___
transpirational, evaporates, capillary, adhesion, cohesion, root, osmosis
State the importance of positive phototropism to the chilli seedlings.
-Absorbs maximum amount of sunlight
-to carry out___
photosynthesis
Explain the differences between the response shown by the shoot and the root.
-Shoot shows positive phototropism
-Root shows negative phototropism
-Shoot grows towards the light
-Root grows away from the light
-When exposed to light from one direction only,___will accumulate in shaded area
-A high concentration of auxin stimulates the___of shoot cells
-A high concentration of auxin inhibits the elongation of root cells
auxin, elongation
Explain how the method used by the farmer can stimulate the ripening of mangoes.
-Ripe mangoes produce the____hormone
-Ethylene hormone is present in the form of___
-The ethylene hormone is accumulated in the container
-All the mangoes will ripen at the___time
ethylene, gas, same
State one factor that determines the distribution of auxin hormones in corn seedlings in geotropism.
The pull of gravity
Explain how the pull of gravity affect the distribution of auxin hormones.
-The pull of gravity causes the auxin hormone to accumulate at the___of the shoot tip and root tip
bottom
Give one function of the auxin hormone in corn fruit.
Promote fruit development
Hormone M is functioning in inducing seed dormancy and inhibit the plant growth. What is hormone M ?
Abscisic acid
State other functions of abscisic acid.
-Stimulates abscission of___fruits, leaves and flowers
-Induces____closing during drought season
-Inhibits growth of___and seed germination
mature, stomatal, buds