Answer: These may be:
- physical defenses (1st line)
- chemical defenses (2nd line)
Explanation:
Plants employ several methods in order to defend themselves from pathogens. These may be physical defenses or chemical ones. Several have adaptations to their surfaces that prevent the entry of pathogens, called physical barriers such as
- thick waxy cuticles
- thorns, which are modified plant branches
- spines, which are modified plant leaves
- gall production at infected sites to prevent pathogenic spread
Chemical defenses include the production or secretion of:
- defensins
- antimicrobials such as tannins or resins
- gum at areas facing pathogenic attacks
Answer:
The correct answer is - Polymers are macromolecules
Explanation:
Macromolecules are termed as macro and molecules mean huge atoms, for instance, proteins. It is made by the polymerization of monomers. Macromolecules are being made out of numerous atoms.
The usually utilized atoms in natural chemistry are lipids, carbohydrates, nucleic acid, and proteins, all are made of their respective monomers that are fatty acids, monosaccharides, nucleotides, and amino acids.
Thus, the correct answer is - Polymers are macromolecules
<span>This kind of relationship is called mutualism and is defined by both parties being equally beneficial to each others survival. An example of this kind of relationship is found a lot in nature, as with the relationship between fish and coral reefs in the sea. Corals provide shelter and protection for the small fish while the fish in return also provide protection from algae and seaweed invading in on their space and killing off the coral.</span>
Answer: Xylem fibers and xylem parenchyma are the elements of the xylem which is a vascular tissue in plants.
Explanation:
Xylem fibers are dead cells whereas the xylem parenchyma are living cells.
Xylem fibers are responsible for providing structural support to the entire structure of xylem whereas the xylem parenchyma is involved in conducting of water and minerals.
In xylem fibers the lignin is present whereas it is absent in xylem parenchyma.
