Question 1

What are the main differences between plant and animal cells?

Accepted Answer

Plant and animal cells are both eukaryotic, meaning they have a nucleus, but they have some key differences. Plant cells have a rigid cell wall made of cellulose, chloroplasts for photosynthesis, and a large central vacuole for storage and maintaining cell structure. Animal cells lack these structures but have centrioles involved in cell division. Understanding these differences is crucial for Edexcel Lower Secondary Science students studying Biology.

Question 2

How do cells organize into tissues and organs?

Accepted Answer

Cells with similar functions group together to form tissues. For example, muscle cells form muscle tissue. Different tissues then combine to form organs, each with specific functions. For instance, the heart is an organ made up of muscle tissue, nerve tissue, and blood tissue. This organization is a fundamental concept in Biology, especially for students following the Edexcel Lower Secondary curriculum.

Question 3

What is the function of the cell membrane?

Accepted Answer

The cell membrane, also known as the plasma membrane, is a crucial component of both plant and animal cells. It acts as a barrier, controlling the movement of substances in and out of the cell. This selective permeability is vital for maintaining homeostasis within the cell. Understanding the cell membrane's role is essential for students studying Cells and organisation in Edexcel Lower Secondary Science.

Question 4

Why is the nucleus important in a cell?

Accepted Answer

The nucleus is often referred to as the control center of the cell because it contains the cell's genetic material (DNA). It regulates cell activities such as growth, metabolism, and reproduction by controlling gene expression. For Edexcel Lower Secondary Biology students, understanding the nucleus's role is key to grasping how cells function and organize.

Question 5

How do specialized cells contribute to the function of an organism?

Accepted Answer

Specialized cells have unique structures that enable them to perform specific functions. For example, red blood cells are specialized to carry oxygen, while nerve cells transmit signals. This specialization allows organisms to function efficiently and adapt to their environments. Learning about cell specialization is an important aspect of the Cells and organisation topic in the Edexcel Lower Secondary Science curriculum.

Cells and organisation

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