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Edexcel A-Level Biology AS 3.2 Organisation in Multicellular Organisms Questions

Use complete mark-scheme definitions to distinguish tissues, organs and organ systems, then classify plant examples such as xylem, phloem and mesophyll at the correct level.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • Define tissue as similar cells working together to perform a specific function.
  • Define an organ and organ system through their component tissues or organs and function.
  • Classify plant examples such as xylem, phloem or mesophyll at the tissue level.

Edexcel A-Level Biology AS 3.2 Organisation in Multicellular Organisms Questions question 1

[Maximum number: 1]

The five stages of cancer are used to describe the size and spread of a cancer in a human body.

The mitotic index of a tissue can be used to determine the stage of cancer.

A higher mitotic index is usually linked to a later stage of cancer.
The mitotic index is calculated using the formula

 Mitotic index = number of cells in mitosis  total number of cells ×100\text { Mitotic index }=\frac{\text { number of cells in mitosis }}{\text { total number of cells }} \times 100

Tests were performed on three patients, P, Q and R, who had cancer.
The table shows the number of cells that were counted in each stage of the cell cycle per mm2\mathrm{mm}^{2} of tissue, taken from the same organ in each patient.

Table for Question Edexcel A-Level Biology AS 3.2 Organisation in Multicellular Organisms Questions question 1 — Edexcel A-Level Biology AS

State what is meant by the term tissue.

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