Hormones are chemicals secreted by endocrine glands.
.1
Name the gland in the brain that is often called the 'master gland'.
[1 mark].2
Which gland produces insulin?
[1 mark].3
How do hormones travel to their target organs?
[1 mark]OCR Gateway GCSE Combined Science June 2025 Paper 1
5 questions on this paper's topics
19:001 of 5
A leaf is a plant organ made of several tissues.
.1
What is the main function of the palisade mesophyll tissue?
[1 mark].2
Name the tissue that carries water from the roots to the leaves.
[1 mark].3
What does phloem tissue transport?
[1 mark]A student tests some foods for starch, sugar and protein.
.1
Which solution does the student use to test for starch?
[1 mark].2
The student heats a food with Benedict's solution. The food contains a lot of glucose.
What colour does the mixture turn?
[1 mark].3
Name the solution used to test for protein.
[1 mark].4
Suggest why the student heats the Benedict's test tubes in a water bath rather than directly over a Bunsen burner.
[1 mark]Body cells divide in a series of stages called the cell cycle.
.1
Put the stages of the cell cycle in the correct order, starting with the first.
[1 mark].2
Name the type of cell division in the cell cycle that makes two genetically identical cells.
[1 mark].3
In the nucleus of a human body cell, how are the chromosomes arranged?
[1 mark]A student looks at a thin slice of leaf under a light microscope.
.1
Which equation links magnification, image size and real size?
[1 mark].2
A guard cell is 0.05 mm long. In the student's drawing it is 20 mm long.
Calculate the magnification of the drawing.
[1 mark].3
An electron microscope can show ribosomes, but a light microscope cannot.
What is the reason?
[1 mark]