Question 1 of 20 101 total questions
The bacteria that reduce nitrates in the soil into gaseous nitrogen are referred to as
A nitrifying bacteria
B denitrifying bacteria
C putrefying bacteria
D saprophytic bacteria
The frog is considered a better swimmer than the toad because it
A has more pronounced webbed digits
B has much longer and stronger hind limbs
C lives in water most of the time
D is more streamlined than the toad
The producers in a food chain in an aquatic environment are
A birds
B phytoplankton
C zooplankton
D fishes
The maximum size of a population that a given area can support is known as
A population density
B carrying capacity
C population growth
D maximum population
Ecology simply means the study of
A particular species of plants and animals
B the interrelationship between orgganisms and their environment
C the properties of a habitat
D the interrelationship between plants and animals
Which of the following associations is an example of epiphytism?
A Lice in the human hair
B Mistletoe on citus fruit.
C Egret on cow
D Fern on palm tree
Which of the following substances is not complex carbohydrate?
A Glycogen
B Cellulose
C Starch
D Glucose
The correct arrangement of food classes of the same quantity in the order of magnitude of energy value in animals in descending order is
A Carbohydrates, fats and oils, water, protein
B Fats and oils, carbohydrates, protein, water
C Water, fats and oils, carbohydrates, protein
D Protein, fats and oils water and carbohydrates
The name of the enzyme that catalyses the conversion of glucose to glucose-6-phosphate at the beginning of glycolysis is
A phospho-fructokinase
B glucose isomerase
C hexokinase
D glucose-6-kinase
Which of the following factors is likely to increase the rate of transpiration in plants?
A A reduction in the number of stomata per unit surface area
B Increase in humidity around the leaves of plants
C An increase in leaf surface area to volume ratio
D Removal of leaves from plant
Conduction of water and mineral salts through the xylem vessels is enhanced because the xylem cells are
A thickened with lignin
B long, narrow tubes placed end to end
C close to the endodermis
D centrally placed in the roots
The process by which plants manufacture food from carbon dioxide and water using energy from the sun is called
A chemosynthesis
B photosynthesis
C anabolism
D catabolism
The resolution of a microscope refers to its power to
A increase an object's apparent size
B distinguish clearly between two objects
C scan the surface of an object
D focus on an object
Which of the following structures is not essential in a wind pollinated flower?
A Anther
B Ovary
C Stigma
D Petal
Which of the following conditions would result result in a decrease in the production of antidiuretic hormone?
A Abnormally high blood sugar level
B Drinking large quantities of water
C Increase in osmotic pressure of blood
D Period of strenuous exercise
Which part of the nephron is associated with ultra-filtration?
A Distal convoluted tubule
B Proximal convoluted tubule
C Collecting duct
D Bowman's capsule
The maintenance of a stable internal environment within the body of a mammal is known as
A osmosis
B plasmolysis
C homeostasis
D excretion
In humans, excretion of hypertonic urine is associated with the
A distal convoluted tubule
B loop of Henle
C bowman's capsule
D proximal convoluted tubule
A substance present in the glomerular filtrate in the mammalian Kidney is
A glucose
B fibrinogen
C albumen
D blood platelets
Which of the following structures is used for respiration in insects?
A Lungs
B Thorax
C Cuticle
D Spiracles
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