Explanation

Iodine is involved in the formation of thyroid hormones (triiodothyronine (T3) and thyroxine (T4)) produced by the thyroid gland.

Iodine is essential for the production of thyroid hormones, which are necessary for:

• Energy production
• Regulation of metabolic rate
• Growth and development
• Nervous system function

Explanation

Human blood is divided into 4 main groups:

1. A
2. B
3. AB
4. O

These groups are determined by the presence or absence of specific antigens on the surface of red blood cells.

Explanation

• In a mercury thermometer, the mercury in the bulb expands and rises in the tube, which has a linear scale ranging from 94°F to 108°F.
• This specific range is commonly used for medical thermometers to measure human body temperature.

Explanation

• Measurement involves comparing an unknown quantity (the measured) with a standard quantity (the unit) to determine its value.
• This process is a fundamental aspect of science and engineering, allowing us to quantify physical properties and phenomena.

Explanation

The correct order from least to most acidic:

• Ammonia (pH 11-12, strongly basic)
• Blood (pH 7.4, slightly basic)
• Milk (pH 6.5-7, slightly acidic)
• Orange juice (pH 3.5-4.5, strongly acidic)

Explanation

• The products in the reaction are Carbon dioxide (CO2) and Water (H2O).
• These products are formed through the combustion of Methane (CH4) and Oxygen (O2), releasing energy in the process.

Explanation

• The incorrect statement is: States of matter does not change during chemical reactions.
• During chemical reactions, states of matter can change.
• For example, a solid may dissolve in a liquid, a liquid may vaporize, or a gas may condense into a liquid.

Explanation

• Meiosis is a type of cell division that produces four non-identical daughter cells, each with half the number of chromosomes as the parent cell.
• This process is essential for sexual reproduction, as it allows for the mixing of genetic material from two parents and the creation of genetically diverse offspring.

Explanation

• Meiosis is the process by which sex cells (sperm and egg cells) are divided and gametes are formed during reproduction in humans.
• Meiosis involves two successive cell divisions (meiosis I and meiosis II) that result in four non-identical daughter cells, each with half the number of chromosomes as the parent cell.

Explanation

• Phosphorus-32 is used to study the uptake of phosphorus-containing fertilizers.
• This radioactive isotope helps in tracing and measuring the absorption and movement of phosphorus within plants.