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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
The part of the brain that receives nerve impulses from the semicircular canals is the	cerebellum.
A light stimulus is converted into a nerve impulse in the	retina
A human somatic cell has	44 autosomes and 2 gonosomes.
A person with middle-ear infection is usually advised not to fly in an aeroplane because the	Eustachian tube is unable to equalise the pressure on either side of the tympanic membrane.
The phase in the cell cycle when DNA replication occurs	Interphase
The part of the peripheral nervous system that controls involuntary actions	Autonomic nervous system
A plant hormone that causes leaves to fall off trees in autumn	Abscisic acid
Measurement of the total amount of carbon dioxide emissions of an individual per year	Carbon footprint
The division of the cytoplasm through the constriction of the cell membrane at the end of cell division	Cytokinesis
The structure in the amniotic egg that stores wastes	Allantois
The inner lining of the uterus where implantation of the embryo occurs	Endometrium
Part of the female reproductive system where fertilisation occurs	Fallopian tube
The part of the brain that controls the heart rate	Medulla oblongata
The maintenance of a constant internal environment in the body within certain limits	Homeostasis
The plant growth hormone that promotes seed dormancy	Abscisic acid
A collective name for the membranes that protect the brain	Meninges
A hormone that regulates the salt concentration in human blood	Aldosterone
A layer in the atmosphere that is damaged by chlorofluorocarbons	Ozone
A hormone that stimulates the maturation of sperm	Testosterone
The membranes which protect the central nervous system	Meninges
A plant growth hormone that stimulates seed germination	Gibberellin
The nervous system which consists of cranial and spinal nerves	Peripheral nervous system
A branch of the autonomic nervous system that decreases the heartbeat back to normal	Parasympathetic system
The outermost extra-embryonic membrane surrounding the embryo	Chorion
The hormone that regulates the salt concentration in the human body	Aldosterone
The blood vessel in the umbilical cord that carries blood rich in oxygen and nutrients	Umbilical vein
The hormone inhibited by an increased level of thyroxin	TSH
The period of development of an embryo in the uterus, between fertilisation and birth	Gestation
The structure in the head of a sperm cell that contains enzymes which break down the membrane surrounding the ovum	acrosome
Disease characterised by a lack of insulin production	Diabetes mellitus
The period of development of an embryo in the uterus between fertilisation and birth	Gestation
Tube that connects the pharynx and the middle ear	Eustachian tube
A process by which nutrients become highly concentrated in a body of water, leading to increased growth of organisms such as algae	Eutrophication
A stage in the development of humans in which the embryo consists of a layer of cells surrounding a cavity	Blastocyst
The structure at the tip of a sperm cell containing enzymes and which makes contact with the egg cell during fertilisation	Acrosome
The gland in the male reproductive system of humans that produces an alkaline fluid to counteract the acid environment of the vagina	Prostate
The duct leading from the testis to the urethra in human males	Sperm duct
The process by which the ovum is formed through meiosis in the ovary	Oogenesis
The type of development in birds where the young are incapable of moving around after hatching	Altricial development
The first organisms to occupy an uninhabited area	Pioneer
The fibrous outgrowths of a neuron that transmits nerve impulses to the cell body of the same neuron	Dendrites
A phenomenon where an increase in one hormone inhibits the secretion of another hormone	Negative feedback
A disease in which the hormonal control of blood glucose is defective because of a deficiency of insulin	Diabetes
The physical count of every individual in a population	Census
The maximum number of individuals that can be supported by an environment under prevailing conditions	Carrying capacity
The increase of the internal diameter of blood vessels so that more blood flows through them	Vasodilation
The movement of individuals into a population	Immigration
The heat-regulating centre in the brain	Hypothalamus
The finger-like projections that develop from the outer extraembryonic membrane	Chorionic villi
Division of the cytoplasm during cell division	Cytokinesis
A plant species that does not belong to an area and which outcompetes the indigenous species of that area	Invasive alien
A structure in the female reproductive system where semen is deposited during copulation	Vagina
The permanent, large-scale removal of trees and vegetation from an area	Deforestation
A hormone that stimulates the mammary glands to produce milk	Prolactin