Year 9 Science: Maintaining Life

Front

What is essential for plants and supports absorption, transport, and physiological processes?

Back

Water

Front

How do root hairs absorb water?

Back

Root hairs increase the surface area for absorbing water and mineral ions from the soil.

Front

What is the structure of xylem vessels?

Back

Xylem vessels are long, tube-like dead cells with no cytoplasm or nucleus, consisting only of cell walls and an empty interior.

Front

What is transpiration?

Back

Transpiration is the loss of water vapor from leaves, a key process in water movement through plants.

Front

What role does water play in supporting plants?

Back

Water-filled plant cells are firm and help keep the plant upright; water-deficient cells cause wilting.

Front

What is excretion?

Back

Excretion is the process of eliminating waste substances produced or accumulated within the body.

Front

What waste substances are excreted by the body?

Back

Carbon dioxide, urea, and excess water are excreted.

Front

How is urea formed in the body?

Back

Excess protein is converted by the liver into urea, which is then filtered by the kidneys.

Front

What is the role of the kidneys in excretion?

Back

The kidneys filter urea and excess water from the blood, forming urine.

Front

What is necessary for a healthy pregnancy?

Back

A healthy pregnancy requires proper nutrients, energy from respiration, and waste excretion.