A Level Biology - Plant and Animal Responses

Plant hormones which are responsible for control of stem elongation and seed germination

A directional growth response to gravity

A reflex action that straightens the leg when the tendon below the knee cap is tapped

Any chemical substance released by one living thing, which influences the behaviour or physiology of another living thing

A directional growth response to light

A response that does not involve any processing by the brain

Organic nitrogen-containing bases that have important physiological effects on animals; includes nicotine, quinine, strychnine and morphine

Phenolic compounds, located in cell vacuoles or in surface wax on plants

Components of an ecosystem that are non-living

Region of the brain dealing with the higher functions such as conscious thought; it is divided into two cerebral hemispheres

Components of an ecosystem that are living

Part of the nervous system responsible for controlling the involuntary motor activities of the body

Region of the brain coordinating balance and fine control of movement

Endocrine gland at the base of the brain, below but attached to the hypothalamus; the anterior lobe secretes many hormones; the posterior lobe stores and releases hormones made in the hypothalamus

The motor neurones under conscious control

The sensory and motor nerves connecting the sensory receptors and effectors to the CNS

A compound in muscle that acts as a store of phosphates and can supply phosphates to make ATP rapidly

Plant hormones which are responsible for regulating plant growth

Muscle under voluntary control

Muscle found in the heart walls

The central part of the nervous system composed of the brain and spinal cord

Smooth muscle that contracts without conscious control

A secondary messenger released inside cells to activate a response

A directional growth response in which the direction of the response is determined by the direction of the external stimulus

Inhibition of lateral buds further down the shoot by chemicals produced by the apical bud at the tip of a plant shoot

The structure at which a nerve meets the muscle; it is similar in action to a synapse

An intracellular enzyme, which is activated by certain hormones

The part of the brain that controls physiological processes