Answer:
Ovules
A
Explanation:
The ovule can be found on a megasporophyll, which itself is located on a scale. On each megasporophyll of the female strobilus two seeds can develop after fertilization. In each megasporangium (the female carrier of spores) a megasporocyte is present which leads to four megaspores after meiosis.
The main purpose of biological taxonomy is to use a systematic method to name,
organize, and show relationships among species.
Taxonomy<span> (from
Ancient Greek: τάξις taxis, "arrangement", and -νομία -nomia,
"method") is the science of defining groups of biological<span> organisms on the basis of shared characteristics
and giving names to those groups.</span></span>
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Nicotine and cigarette smoke extract show acute physiological effects on lungs.
Explanation:
Cigarette smoke contains many chemicals that interfere with the body's method of filtering air and cleaning out the lungs. The smoke irritates the lungs and leads to overproduction of mucus. It also paralyses the cilia which results in accumulation of toxins and mucus, resulting in congestion of the lungs.
Tobacco smoke increases tracheal pressure, pulmonary artery pressure, systemic blood pressure and left atrium pressure. It decreases cardiac output and blood flow to the left lower lobe. It induces bronchoconstriction thus decreases peak flow in healthy subjects. It is also known to cause temporary slowing of mucociliary clearance of the lungs.
Answer:
A closed container designed to hold gases or liquids at a pressure substantially higher or lower than the ambient pressure