Which plant hormone signals guard cells to close stomata during drought conditions?

Which part of the eye is the coloured ring that controls pupil size regulating light entry?

Which type of white blood cell produces specific antibodies against antigens?

Which structure in flowering plants contains ovules that develop into seeds after fertilisation?

What is the term for organisms that maintain a stable internal environment despite external changes?

Which type of plant reproduction involves new plants growing from cuttings runners or bulbs?

Which process by which bacteria take up free DNA from their environment was discovered by Griffith?

Which disease is caused by Mycobacterium tuberculosis primarily affecting the lungs?

Which type of muscle is under voluntary control and attached to bones to enable movement?

What is the role of helper T cells in coordinating the immune response?

Which layer of the skin contains melanocytes that produce the pigment responsible for skin colour?