Question 1 of 20 61 total questions
In an ecosystem the organism which changes light energy into stored chemical energy is the
A consumer
B decomposer
C producer
D carnivore
Which of the following instruments is used to measure the speed of a stream?
A Simple float
B Secchi disc
C Quadrat frame
D Rain gauge
Which of the following factors is not associated with aquatic habitats?
A Salinity
B Turbidity
C Temperature
D Edaphic
A stable self-sustaining environment produced by an interaction between the biotic and abiotic components is best described as
A a niche
B a community
C an ecosystem
D a habitat
Possession of strong adhesives is a feature of animals living in/on
A sandy beaches
B rocky shores
C benthic zones
D deserts
A population is best described as
A a group of the same species of organisms living together
B a group of animals and plants living together
C a group of insects and grasses
D different species of wild animals
In the marine food web, the source of energy to the producer comes from
A sea waves
B sea water
C sun
D air
Trees in savannah habitats usually have heavy thick bark which mainly
A reduces the rate of transpiration
B protect them from the scorching sun
C protect them from heavy winds
D resist bush tires
Which of the following juices contains the enzyme ptyalin?
A Gastric juice
B Pancreatic juice
C Succus
D Saliva
Which of the following elements is required in large amounts by plants
A Molybdenum
B Boron
C Copper
D Phosphorus
Which of the following substances has the highest amount of energy in joules per unit weight?
A Carbohydrates
B Proteins
C Fats
D Vitamins
Which of the following elements is required in large amounts by plants
A Molybdenum
B Boron
C Copper
D Phosphorus
Which of the following statements is not true of the light stage of photosynthesis?
A Chlorophyll is energized by sunlight
B Water molecules split into hydrogen and hydroxyl ions
C Carbon (IV) oxide is reduced by hydrogen atoms in NADPH2
D Water is formed
When both ovaries of the human female ovulate simultaneously and both ova are fertilized, then
A identical twins are produced
B fraternal twins are produced
C Siamese twins are produced
D the children produced are genetically identical
Which of the following describes an example of fertilization in higher organisms?
A Fusion of sperm and egg nuclei
B Ejaculating of sperm into a female body
C Male gametes germinating in the pollen tube
D A pollen grain landing on a sticky stigma
Reading the verdict of a case by a judge or magistrate is an example of
A a reflex action
B an instinct
C a conditioned reflex
D a voluntary action
Which of the following glands secretes a substance into the blood stream of a frightened person?
A Adrenal glands
B Salivary glands
C Gastric glands
D Parathyroid glands
Which of the following takes place when a person’s body temperature rises above 37o C
A Sweating and vasoconstriction
B Panting and vasoconstriction
C Sweating and vasodilation
D Panting and vasodilation
A faster colour change of a dry cobalt chloride paper affixed to the lower surface of a leaf than the upper one, indicates that
A sunlight slows down water loss from the upper surface
B the lower surface of the leaf has more stomata
C Sunlight causes the stomata on the upper surface to close
D stomata are not present on the upper surface of a leaf
In plant respiration occurs in
A mesophyll cells only
B the root only
C the stomata and lenticel only
D all living cells
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