Hydrogen (H2) has the lowest molar mass among the given gases, thus it has the highest root mean square speed at the same temperature.

The pituitary gland is often referred to as the 'master gland' because it regulates the functions of other endocrine glands.

Noble gases are found in Group 18 of the periodic table, characterized by their lack of reactivity due to having a full valence shell.

Plants are known for being autotrophic as they can produce their own food through photosynthesis.

Archaebacteria are known for their ability to thrive in extreme environments.

Pteridophytes are the first group of plants to develop vascular tissues, which help in the transport of water and nutrients.

Gymnosperms are known for producing seeds that are not enclosed in flowers.

C4H9I has the highest boiling point due to the larger molecular size and stronger van der Waals forces.

3-bromobutane is more likely to undergo elimination reactions due to the presence of a tertiary carbon.

Auxins are primarily responsible for maintaining apical dominance by inhibiting the growth of lateral buds.

Ethylene is the hormone that plays a key role in the ripening of fruits.

Auxins play a crucial role in maintaining apical dominance by inhibiting the growth of lateral buds.

Parathyroid hormone (PTH) is responsible for increasing blood calcium levels by promoting calcium release from bones and increasing calcium absorption in the intestines.

Abscisic acid is involved in the regulation of stomatal closure during water stress to prevent water loss.

Progesterone is a hormone that plays a key role in regulating the menstrual cycle and maintaining pregnancy.

Aldosterone is a hormone that helps regulate water balance by promoting sodium retention in the kidneys, which in turn affects water retention.

Abscisic acid plays a key role in closing stomata during water stress, thus regulating water loss.

Antidiuretic hormone (ADH), also known as vasopressin, plays a key role in regulating water balance by promoting water reabsorption in the kidneys.

Abscisic acid plays a crucial role in regulating water loss by causing stomatal closure during water stress.

Abscisic acid plays a crucial role in helping plants respond to drought stress by closing stomata.

Ethylene is the primary hormone responsible for the ripening of fruits.

Auxins are known to promote cell elongation by loosening the cell walls, allowing cells to expand.

Estrogen plays a crucial role in regulating the menstrual cycle, along with progesterone.

Epinephrine (adrenaline) is the primary hormone responsible for the fight-or-flight response, preparing the body for quick action.

Thyroxine is produced by the thyroid gland and plays a crucial role in regulating metabolism.

Adrenaline (epinephrine) is the hormone that prepares the body for a 'fight or flight' response during stressful situations.

Testosterone is the hormone responsible for the development of secondary sexual characteristics in males, such as increased muscle mass and body hair.

Thyroxine (T4) is a hormone produced by the thyroid gland that plays a crucial role in regulating metabolism and energy levels.

Epinephrine, also known as adrenaline, is secreted by the adrenal medulla and is involved in the body's fight-or-flight response.

Insulin is secreted by the pancreas and is responsible for lowering blood glucose levels by facilitating glucose uptake by cells.