Question 1 of 20 5,032 total questions
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
Which of the following organisms causes syphilis?
A Mycobacterium tuberculosis
B Bordetella pertusis
C Treponema pallidlum
D Clostridium tetani
Only specially adapted micro-organisms are found in
A salty water
B humid air
C moist soil
D mouth cavities
Which of the following statements is true about movement of the forearm? In
A bending the arm, the biceps relax and the triceps contract
B bending the arm, the biceps contract and the triceps relax
C straightening the arm the biceps contract and the triceps relax
D straightening the arm, both biceps and triceps contract
The basis of growth involves the following processes except
A cell reduction
B cell division
C cell differentiation
D cell enlargement
The role of ATP include all the following activities except
A provision of energy to do work in living organisms
B transmission of nerve impulse
C keeping the body warm in homoithermic animals
D producing water during aerobic respiration
Raw materials required by green plants to manufacture their food are
A mainly fluids
B inorganic substances
C living materials
D mainly gases
Which of the following statements defines plasmolysis?
A Shrinking of a plant cell in a solution
B Shrinking away of cytoplasm from an animal cell membrane
C Shrinking away of the cytoplasm from the plant cell wall
D shrinking of the vacuole and leaving the cytoplasm attached to the cell wall
Which of the following substance pass through the root cell membrane by osmosis?
A Cell sap
B Carbon dioxide
C oxygen
D water
In active transport, molecules move against a concentration gradient, therefore
A molecules move from a region of low concentration to a region of high concentration
B molecules move from a region of high concentration to a region of low concentration
C the concentration gradient has little effect on the movement of molecules
D molecules force their way through special channels
Which of the following Best explains why It is difficult to see clearly in dim light?
A Initially the eyes cannot operate when the light is dim
B The choroid reflect all the light that enters the eye
C Too little light reaches the retina and so the cones may not be stimulated at all
D Dim light causes the pupil to close up so that not much light enters the eye
Which of the following pairs of organisms exist as colonies?
A Obelia and Euglena
B Pandorina and Volvox
C Chlamydomonas and Amoeba
D Hydra and Spirogyra
Which of the following pairs of organisms are photosynthetic?
A Amoeba and Paramecium
B Volvox and Rhizopus
C Chlamydomonas and Euglena
D Nostoc and Plasmodium
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