Question 1 of 20 2,099 total questions
which of the following organisms does not show colour adaptation to its environment?
A Chameleon
B Earthworm
C Fish
D Toad
Food chains are relatively short because
A of energy recycling in the ecosystem
B energy gain at each trophic level is high.
C of energy loss at each trophic level
D energy flow in an ecosystem is uni-directional.
P → Q → R → S → T
Which of the following statements best describes the organism designated R? It
A feeds on S
B is a primary consumer
C is a producer as well as a consumer
D is a secondary consumer
P → Q → R → S → T
he organism designated P in the food chain above is normally sustained by energy from
A sunlight
B carbohydrates
C green plants
D mineral salts.
Which of the following organisms is a primary consumer?
A Dog
B Sheep
C Grass
D Fungus
Which of the following statements is true about sandy soil? It
A has limited air space
B is light and easy to dig
C drains slowly
D is heavy and poorly aerated
Which of the following instruments is used to estimate the number of plants in a habitat?
A Pooter
B Pitfall trap
C Quadrat
D Sweep net
What is the critical limiting factor for plants below the photic zone is an aquatic ecosystem?
A Availability of nutrients
B Availability of water
C Intensity of light
D Carbon dioxide concentration
Which of the following statements about ecosystems is false?
A All the energy entering the ecosystem is passed on to decomposers
B The primary producers provide energy for herbivores and carnivores
C Ecosystems must start with the capture of energy by autotrophs
D Energy transfer from one trophic level to the other is not 100% efficient.
Which of the following organisms is an endoparasite?
A Mice
B Mosquito
C Ascaris
D Dodder
An organism whose source of carbon is inorganic is likely to be a/an
A heterotrophic organism
B autotrophic organism
C symbiotic organism
D parasitic organism
Pepsin is secreted as an inactive precursor called pepsinogen because
A pepsin as an enzyme is quickly destroyed by the alkaline food from the mouth
B all digestive enzymes pass through a precursor stage
C pepsin is a proteolytic enzyme and might attack the stomach tissues
D pepsin is not required in large quantities
Which of the following treatments would increase the rate of transpiration in a potted plant?
A Placing it in a cold room
B Placing it under a fan in a room
C Putting it in a cupboard
D Smearing grease on the lower surface of the leaves
The mesophyll layer of a leaf consists of
A wax and cutin
B cells with lignified walls
C irregularly shaped collenchyma cells.
D photosynthetic parenchyma cells.
Which of the following cycles involves the process of precipitation and transpiration?
A Water cycle
B Carbon cycle
C Nitrogen cycle
D Oxygen cycle
Which of the following processes removes carbon from the atmosphere?
A Putrefaction
B Photosynthesis
C Volcanic eruption
D Burning of fuels
A seed of a flowering plant can best be described as
A radicle and plumule
B the developed ovule
C the embryo and endosperm
D developed ovary
Spectacles with convex lenses correct long-sightedness by
A converging the light rays before they enter the eye.
B diverging the light rays before they enter the eye.
C reducing light intensity before it enters the eye
D increasing light intensity before it enters the eye
The part of the ear which contains nerve cells sensitive to sound vibrations is the
A cochlea
B ampulla
C tympanum
D malleus
The reason why hospitals use saline solutions as drip instead of water is
A because salt is a preservative
B to prevent contamination of the body
C to maintain the composition of the body fluids
D to increase the number of blood cells
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