O-Level Combined Science — Biology 2

Question 1

What is the process by which water moves from an area of high water potential to low water potential through a semi-permeable membrane?

Accepted Answer

Osmosis

Answer

Osmosis is the net movement of water molecules through a partially permeable membrane from an area of higher water potential to lower water potential.

Question 2

Which part of the plant absorbs water and minerals from the soil?

Accepted Answer

Root hair cells

Answer

Root hair cells have a large surface area and thin walls to maximise absorption of water and mineral ions from the soil.

Question 3

What is the role of enzymes in the body?

Accepted Answer

To act as biological catalysts

Answer

Enzymes are biological catalysts that speed up chemical reactions in the body without being consumed. Each enzyme has a specific substrate.

Question 4

What is the term for the variety of different species in an ecosystem?

Accepted Answer

Biodiversity

Answer

Biodiversity refers to the variety of life in a given area, including the number and variety of different species.

Question 5

Where does fertilisation occur in the human female reproductive system?

Accepted Answer

Fallopian tube

Answer

Fertilisation typically occurs in the fallopian tube (oviduct), where the sperm meets the egg after ovulation.

GCE O-Level Practice Test

GCE O-Level Practice Test

O-Level Combined Science — Biology 2