OCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdf
OCR A+ Level Biology Paper 3
(Priority Topics)
What do plants respond to for survival? - ANS-Biotic (living) and abiotic (non-living)
factors
What are tropisms? - ANS-Directional growth responses in plants
What 3 things can plants release for survival? - ANS-Tannins, alkaloids and
pheromones
What controls the growth of a plant? - ANS-Plant hormones
What is the role of gibberellin? - ANS-Growth regulation and stem elongation
What is the role of cytokinin? - ANS-Promoting lateral bud growth
How can phototropism be investigated? - ANS-Shining light onto one side of the plant
and measuring stem elongation on each side.
How can geotropism be investigated? - ANS-Allowing gravity to work on one side of the
experimental plant and observing root growth.
What are the commercial uses of auxins? - ANS-Promotes flowering and prevents fruit
dropping so fruit grows larger. Used as a herbicide to kill weeds.
What are the commercial uses of cytokinins? - ANS-Delays leaf loss and used in tissue
culture to mass-produce plants.
What are the commercial uses of gibberellins? - ANS-Fruit production, germinating
seeds in brewing beer, sugar cane elongation, speeding up plant breeding.
What are the commercial uses of ethene? - ANS-Speeds up fruit ripening and enhances
lateral bud growth. Inhibiting ethene prolongs shelf life.
What are the two main divisions of the nervous system? - ANS-CNS and PNS
OCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdf
, OCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdf
What is the CNS divided into? - ANS-Brain and spinal cord
What is the PNS divided into? - ANS-Sensory system and motor system
What is the motor system divided into? - ANS-Somatic nervous system and autonomic
nervous system
What is the autonomic nervous system divided into? - ANS-Sympathetic nervous
system and parasympathetic nervous system
What is the function of the cerebrum? - ANS-Sensory perception, emotions, willed
movements, consciousness, and memory
What is the function of the cerebellum? - ANS-Fine motor control and voluntary
movement.
What is the function of the hypothalamus? - ANS-Controls homeostatic measures
(thermoregulation and osmoregulation)
What is the function of the medulla oblongata? - ANS-Controls non-skeletal cardiac and
smooth muscles
What are reflexes? - ANS-Rapid neural responses that bypass processing in the brain
when responding to environmental stimuli
What does the 'fight or flight' response do? - ANS-Physiologically prepares an animal to
respond to a threat and enhance survival
What physiological changes occur during the fight or flight response? - ANS-Pupils
dilate, breathing rate increases, heart rate and blood pressure increase, blood glucose
increases, arterioles to muscles and the liver dilate and hairs stand on end.
What is heart rate controlled by when at rest? - ANS-The SAN
Describe smooth muscle. - ANS-Spindle-shaped cells form sheets lining tubular
structures, such as the gut. It contracts slowly but for a long time.
Describe cardiac muscle. - ANS-Links via branches and intercalated discs to allow
waves of excitation to pass all over the muscle.
OCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdf
OCR A+ Level Biology Paper 3
(Priority Topics)
What do plants respond to for survival? - ANS-Biotic (living) and abiotic (non-living)
factors
What are tropisms? - ANS-Directional growth responses in plants
What 3 things can plants release for survival? - ANS-Tannins, alkaloids and
pheromones
What controls the growth of a plant? - ANS-Plant hormones
What is the role of gibberellin? - ANS-Growth regulation and stem elongation
What is the role of cytokinin? - ANS-Promoting lateral bud growth
How can phototropism be investigated? - ANS-Shining light onto one side of the plant
and measuring stem elongation on each side.
How can geotropism be investigated? - ANS-Allowing gravity to work on one side of the
experimental plant and observing root growth.
What are the commercial uses of auxins? - ANS-Promotes flowering and prevents fruit
dropping so fruit grows larger. Used as a herbicide to kill weeds.
What are the commercial uses of cytokinins? - ANS-Delays leaf loss and used in tissue
culture to mass-produce plants.
What are the commercial uses of gibberellins? - ANS-Fruit production, germinating
seeds in brewing beer, sugar cane elongation, speeding up plant breeding.
What are the commercial uses of ethene? - ANS-Speeds up fruit ripening and enhances
lateral bud growth. Inhibiting ethene prolongs shelf life.
What are the two main divisions of the nervous system? - ANS-CNS and PNS
OCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdf
, OCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdf
What is the CNS divided into? - ANS-Brain and spinal cord
What is the PNS divided into? - ANS-Sensory system and motor system
What is the motor system divided into? - ANS-Somatic nervous system and autonomic
nervous system
What is the autonomic nervous system divided into? - ANS-Sympathetic nervous
system and parasympathetic nervous system
What is the function of the cerebrum? - ANS-Sensory perception, emotions, willed
movements, consciousness, and memory
What is the function of the cerebellum? - ANS-Fine motor control and voluntary
movement.
What is the function of the hypothalamus? - ANS-Controls homeostatic measures
(thermoregulation and osmoregulation)
What is the function of the medulla oblongata? - ANS-Controls non-skeletal cardiac and
smooth muscles
What are reflexes? - ANS-Rapid neural responses that bypass processing in the brain
when responding to environmental stimuli
What does the 'fight or flight' response do? - ANS-Physiologically prepares an animal to
respond to a threat and enhance survival
What physiological changes occur during the fight or flight response? - ANS-Pupils
dilate, breathing rate increases, heart rate and blood pressure increase, blood glucose
increases, arterioles to muscles and the liver dilate and hairs stand on end.
What is heart rate controlled by when at rest? - ANS-The SAN
Describe smooth muscle. - ANS-Spindle-shaped cells form sheets lining tubular
structures, such as the gut. It contracts slowly but for a long time.
Describe cardiac muscle. - ANS-Links via branches and intercalated discs to allow
waves of excitation to pass all over the muscle.
OCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdfOCR A+ Level Biology Paper 3 (Priority Topics) .pdf
