Question 1 of 20 155 total questions
Which of these nitrogenous bases is NOT a part of RNA?
A Adenine
B Cytosine
C Guanine
D Thymine
E Uracil
Poor growth and yellowing of leaves in plants is due to deficiency of
A boron
B calcium
C copper
D iron
E phosphorus
Which of these is NOT a structural adaptation of desert plants for water conservation?
A Broad leaves with many stomata
B Leaves reduced into spines
C Scale leaves
D Stems and leaves with thick cuticle
E Sunken stomata
The following are ways of caring for the mammalian skin EXCEPT
A eating balanced diet
B exposing the skin to adequate sunlight
C using skin toning creams
D using moisturising creams to prevent drying
E washing the skin with clean water and soap
Which of the following is NOT a function of placenta in mammals?
A absorption of food
B gaseous exchange
C removal of wastes
D secretion of hormones
E secretion of enzymes.
Which of the following does NOT occur during photosynthesis?
A Carbon dioxide is evolved
B Energy from the sun is utilized
C Glucose is synthesized
D Oxygen is given off
E Split of water
Tsetse-fly is a vector of a disease known as
A cholera
B dysentery
C elephantiasis
D malaria
E trypanosomiasis
All these statements are correct about a vein EXCEPT that it
A carries blood to the heart
B contains blood at low pressure
C has no valve
D possesses fairly thick walls
E usually carries deoxygenated blood
The speed of wind can be measured with an instrument called
A anemometer
B barometer
C hygrometer
D photometer
E thermometer
ln the process of succession, a climax community is established when
A a stable community is achieved
B the colonizers accommodate the new corners
C the colonizers are wiped out
D the first inhabitants settle down
E the new corners dominate the original inhabitants
Which of the following is a nitrifying bacterium?
A Azotobacter
B Clostridium
C Nitrobacter
D Rhizobium
E Staphylococcus
Which of these is a direct photosynthetic product?
A fats
B glucose
C latex
D protein
E starch
Deficiency of calcium in a child’s diet causes
A cretinism
B goiter
C kwashiorkor
D rickets
E scurvy
A waterlogged habitat with low light penetration and very low quantity of dissolved oxygen best describes a/an habitat
A estuarine
B marine
C sahel savanna
D swampy
E tropical rainforest
Birds excrete nitrogenous wastes in form of
A ammonia
B sweat
C urea
D uric acid
E urine
The process which reduces the nitrogen content of the soil is
A ammonification
B denitrification
C nitrogen fixation
D nitrification
E putrefaction
Dry, horny scales in reptiles help them to
A carryout gaseous exchange
B escape from predator
C facilitate movement
D look for mating partners
E prevent water loss.
Which of these statements best defines pyramid of energy?
A energy flow from one tropic level to another
B energy flow from one habitat to another
C the amount of energy in a given area
D the loss of energy from one organism to another
E the rate of energy flow in an area
Autotrophs include all the following EXCEPT
A chemosynthetic bacteria
B diatoms
C green plants
D phytoplankton
E zooplankton
An example of a carnivorous plant is
A cassytha
B lichen
C mucor
D mushroom
E sundew
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