Answer:
a. capillary action of liquid in plant stems
Explanation:
Vascular plants need to transport water from roots to stem and leaves. For this purpose, water molecules adhere to xylem cell walls (xylem is one of the two classes of transport tissues in higher plants). Adhesion, also known as capillary action, is a mechanism produced when water molecules cling to xylem cell walls. Thus, adhesion can be defined as a molecular mechanism caused by the attraction between molecules, in this case, between molecules of the xylem and water molecules.
The hypothesis by the farmer can be tested by conducting experiments using the aged insecticide on a new set of flies on another farm.
<h3>What is a hypothesis?</h3>
A hypothesis is an explanations put forward to explain an observation.
Based on the observation that the insecticide became less effective, the farmer hypothesized that it was because the insecticide degraded with age.
This hypothesis can be tested by using the aged insecticide on a new set of flies on another farm.
Therefore, experiments can be used to confirm or disprove a hypothesis.
Learn more about hypothesis at: brainly.com/question/11555274
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The organelles that scientists believed that it originated by symbiotic relationships between primitive eukaryotes and certain prokaryotes is known as chloroplast. Chloroplast contain chlorophyll which capture energy from sunlight that is used in photosynthesis .This energy is converted to ATP and NADPH
<span>Amino acids are considered as the building blocks of protein's, so amino acid rich food simply means protein rich food. There are 20 classifications for amino acids but nine of them are essential since our body can't make them. Usually in diet important amino acids are Lysine (C6H14N2O2), Leucine (C6H13NO2), Valine (C5H11NO2), Tryptophan (C11H12N2O2), Isoleucine (C6H13NO2) Phenylalanine (C9H11NO2) and Threonine
(C4H9NO3).</span>
