Explanation

• The evaporation of water from the leaves, also known as transpiration, creates a negative pressure that pulls water up the xylem from the roots to the leaves.
• This process is known as the transpiration-cohesion theory.

Explanation

• A proportion is an equation that states that two ratios are equal.
• It is often written in the form: a/b = c/d
• Where a, b, c, and d are values or quantities, and the ratio a/b is equal to the ratio c/d.
• For example: 2/4 = 3/6

Explanation

• Proportion is a mathematical concept, not a step in the biological method.
• The biological method involves observation, data collection, and experimentation to develop and test hypothesis.

Explanation

• Members of the same species form a population, not members of different species.
• A population is a group of individuals of the same species that live in a specific geographic area and can interbreed.

Explanation

Thalassemia is a genetic disorder that affects the production of hemoglobin, a protein in red blood cells that carries oxygen to the body's tissues.

It is characterized by abnormal hemoglobin production, leading to anemia, fatigue, and other complications.

Explanation

Macronutrients are the nutrients that are needed in the highest concentration by living organisms.

They include carbohydrates, proteins, and fats, which provide energy and support growth and maintenance of tissues.

Explanation

There are indeed two main types of metabolic reactions:

1. Anabolic reactions (building molecules, requiring energy)
2. Catabolic reactions (breaking down molecules, releasing energy)

Explanation

When a gas changes into a liquid, the molecules:

• Move closer together (their distance decreases)
• Lose kinetic energy (they slow down)

Explanation

If a spring stretches easily, it means that it requires less force to stretch it a certain distance.

This is indicative of a spring with a small spring constant (k).

The spring constant is a measure of a spring's stiffness.

A smaller value means the spring is less stiff and more easily deformed.

Explanation

• A heterogeneous mixture is a mixture in which the components have different physical properties, such as color, texture, or phase (solid, liquid, or gas).
• In a heterogeneous mixture, the components are not uniformly distributed, and you can often see the individual components.