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How does the xylem structure of the plant help transpiration?

Firstly I would discuss with the student what transpiration is and what xylem vessels are. Transpiration is the inevitable consequence of gas exchange in the leaf causing water to be transported through t...

Answered by Robine V. • Biology tutor

3842 Views

Explain the sequence of events that occur in the control of the cardiac cycle.

The sino-atrial node depolarises which causes a wave of excitation to pass through the atria (right prior to left) before reaching the atrio-ventricular node. The wave of excitation causes systole of the ...

Answered by Hannah G. • Biology tutor

7638 Views

What is the difference between haploid and diploid cells? (2 Marks)

Diploid cells contain 2 sets of chromosomes (23 pairs of chromosomes) e.g. body cells. Haploid cells contain half the amount of chromosomes as diploid cells (only

Answered by Katie D. • Biology tutor

20844 Views

Describe how a sperm cell is adapted to its role (4 marks).

The role of a sperm cell is to fertilise an egg cell and pass on genetic material. The nucleus of the sperm cell contains the male genetic material/DNA. The head of the sperm cell contains many mitochondr...

Answered by Katie D. • Biology tutor

10480 Views

Describe the stages of the mitotic cell cycle, explaining the appearance of cells at each stage.

The cell cycle can be broken into two. When the cell is replicating its DNA and preparing for division, it is in interphase. Interphase cells have a nucleus with chromosomes arranged as c...

Answered by Hannah M. • Biology tutor

11290 Views