Question 1 of 20 5,032 total questions
Mammals acclimatize to reduced oxygen content at high altitudes by
A the stimulation of marrow to reduce the amount of erythrocytes produced
B increasing the rate at which erythrocytes are destroyed
C the stimulation of marrow to produce more erythrocytes
D increasing the break down of the protein portion of the erythrocytes
The dark reaction of photosynthesis involves
A fixation of carbon (IV) oxide to give six-carbon sugar
B fixation of carbon (IV) oxide with the help of oxygen
C use of carbon (IV) oxide to produce glucose using ATP
D fixation of carbon (IV) oxide on chlorophyll using hydrogen
After a meal of yam has been digested, the highest concentration of glucose is to be found in the
A hepatic artery
B pulmonary vein
C hepatic portal vein
D posterior vena cava
Substance manufactured by the leaves are transported to other parts of the plant through the
A phloem
B companion cells
C sieve tubes
D cambium
In the woody stems, gaseous exchange takes place through the
A micropyles
B stomata
C lenticels
D vessels
In plant cells, the chloroplast are located
A inside the cell wall
B outside the protoplasm
C within the vacuole
D within the cytoplasm
They key event in the transition of the amphibians from water to land is the
A replacement of the gills with lungs
B possession of webbed limbs
C development of long hing limbs
D possession of tympanic membrane
In which of the following organisms does each cell combine the function of nutrition, reproduction and growth?
A Rhizophus
B Dryopteris
C Brachymenium
D Spirogyra
The division of a body into two equal halves along a longitudinal plane is called
A bilateral symmetary
B transverse section
C radial symmetry
D longitudinal section
The structure labeled III represents the
A mandible
B palp
C proboscis
D labium
The structure labelled II is used for
A tasting
B feeling
C biting
D sucking
Which of the following is an organ?
A Guard cell
B Liver
C Xylem bundle
D Blood
The structure that is most commonly identified in all living cells under the light microscope is the
A mitochondrion
B chloroplast
C nucleus
D ribosome
The group of Arthropods that has no antennae is the
A Crustacea
B Chilpoda
C Arachnida
D Diplopoda
The possession of scales, laying of eggs with shells and bony structure of the head are characteristics shared by
A birds and reptiles
B fishes and birds
C reptiles and fishes
D birds and molluscs
The organism that has a hydrostatic skeleton is
A Tilapia
B Hydra
C mosquito larva
D earthworm
Which of the following examples best describes camouflagic colouration in organisms?
A A butterfly which has a real colouration on the wing
B A green snake in a green grass
C zebra with vertical stripes on the body
D Certain tree frogs with bright colour patterns
E A flower whose petals and sepals are of the same colou
Which off the following makes up the bee caste?
A Soldiers and Queen
B Drones, soldiers and workers
C Queen, workers and soldiers
D Queen, drones and workers
E Soldiers, Queen and drones
Termites are called social insects because
A the nests are built by the nasute soldiers
B they live together in communities
C the queen allocates duties to the workers
D the king and queen do mate
E the function of the workers and soldiers are very important
In a cross involving a heterozygous red flowered plant (Rr) and a white flowered plant (rr). what is the
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