Answer:
Explanation:
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Answer:
1. Medulla
2. Heart rate and breathing
Explanation:
The brainstem is the part of the brain that was formed earlier in the history of the evolution of the brain, therefore, is present in the posterior region of the brain. The brainstem is composed of three parts called the pons, the midbrain and the medulla.
The medulla is the portion which is connected to the spinal cord and thus the transfers the signals form the spinal cord to the brain structures.
The brainstem controls the main functions of the body like the breathing rate, the heart rate, consciousness, blood pressure and many involuntary functions.
Thus, Medulla and Heart rate and breathing are correct.
Answer:
Troposphere is the lowest layer of Earth’s atmosphere that has undergone a large increase in temperature due to the presence of greenhouse gases.
Explanation:
Troposphere (0 to 12 km) where we live is the lowest layer of earth's atmosphere, which is closest to the earth's surface contains half of the atmosphere. Here most clouds are found and almost all weather occurs. Atmosphere contains approximately 78% of nitrogen , 21% of oxygen and 0.9% of argon. Gases like carbon dioxide, nitrous oxides, methane, ozone and the water vapor constitutes the rest of the atmosphere. Many small particles called aerosols are also there which include dust, spores, pollen, volcanic ash, smoke etc.The greenhouse effect is a natural phenomenon that keeps the temperature on the earth suitable for supporting life. The greenhouse gases includes both natural and man-made gases like carbon dioxide
, methane, nitrous oxide, chlorofluorocarbons, hydrochlorofluorocarbons, ozone, water vapour. They absorb radiation in the atmosphere and create the green house effect. The thermal infrared radiation emitted by the Earth’s surface and the atmosphere is absorbed by greenhouse gases. They trap heat within the surface-troposphere system preventing it from escaping back into space. This is called the greenhouse effect, which increases the temperature of the lower atmosphere.The increase in the atmospheric concentrations of greenhouse gases due to human activity has caused an increase in the natural greenhouse effect. As a result, the atmosphere is trapping too much heat which increases the temperature of the Earth.
Endoplasmic reticulum= transportation of proteins, formation of skeletal framework, help in formation of nuclear membrane during mitosis
Chloroplast= contains chlorophyll, is where photosynthesis takes place, takes in sunlight
Nucleus= contains genetic material, has information for cell functions, is like, directs activities of organelles and cell
The answer is In the tunica, cell divisions are perpendicular to the stem axis, giving rise to thick layers of <span>tissues covering the outside of the tip. </span>
The tunica is a membranous structure which covers the plant organs. It is responsible for the characteristics of leaf edges and margins in the monocots. During the plant growth, perpendicular cell divisions regarding the stem axis result in the membranous<span> structure outside of the tip.</span>
