Answer:
Explanation:
Phloem cells are conducting vessels that are found in vascular plant. They are used in the transport of photosynthate produce during photosynthesis from the source of production to other parts of the body.
It consist of sieve elements, which are the conducting vessel that aids transport of sugar round the body. They are very active before maturity at mature they are no longer in use.
Companion cells are used in replacement of sieve element at maturity, they function in metabolism together with the sieve tube Translocation is the transport or movement of sugar round the body.
Girdlings is the removal of the bark of a plant this can inhibit active transport of food.
Non-reducing sugar are monosacharrides such as glucose that are produce and transported round the body of the plant.
P-protein are found in the plants sap usually in large amount in the sieve elements.
<span>All natural radiation is at a level low enough to be safe</span>
HindII was the first restriction enzyme to be isolated. This enzyme was first isolated from Haemophilus influenzae Rd strain II.
b) One with spiny leaves and a thick stem.
Explanation:
- Plants growing in desert face scarcity of water and they need to check transpiration rate.
- To reduce the rate of transpiration the leaves of desert plands are reduced to spines, which resulted in a reduced surface area and negligible number of stomata.
- The Stems of Desert plants are modified to store water to prevent desiccation and hence they are thick and succulent.
<span>Antibiotics need to be used with caution because of evolution. If you treat bacteria with an antibiotic, some will be resistant by sheer chance. Those ones will survive and go on to divide - producing more antibiotic resistant bacteria. With medical antibiotics, they must be taken for the entire course. Even after symptoms have passed, bacteria remain in the body. If a patient stops taking antibiotics too early, the survivors can keep dividing and cause a new antibiotic resistant infection. With the normal course of medication, antibiotics kill off enough bacteria and keep them at bay long enough for the immune system to finish the job and take care of any resistant stragglers.
The real danger, though, comes from antibiotic use in livestock. It's more cost effective to feed cattle with a constant supply of antibiotics, whether they're sick or not (as opposed to just treating them when they're sick). These antibiotics keep them from getting sick, but it means that eventually bacteria adapt to them and gain resistant. To make matters worse, the antibiotics are often passed from their bodies in their waste, which can go on to contaminate waterways. This can disrupt ecosystems and produce antibiotic-resistant bacteria in the wild. This type of usage is of much more concern because of its scale - there are far more cows on antibiotics than people</span>