Multiple Choice QuestionsEnzyme and carbohydrates dominate in the digestive tract of
carnivores
omnivores
parasites
herbivores
D.
herbivores
A herbivore is an animal that gets its energy from eating plants and only plants. These animals eat more carbohydrate food, therefore enzyme carbohydrate dominates.
The first animal domesticated by primitive man was
dog
horse
cat
cow
A.
dog
Dog was the first animal to be domesticated by man.
The correct sequence for the formation of chemicals on the primitive earth is
NH3, protein, carbohydrate and nucleic acid
NH3, water, nucleic acids and proteins
NH3, nucleic acids, protein and carbohydrate
protein, carbohydrate, water and nucleic acids
B.
NH3, water, nucleic acids and proteins
As the earth cooled, free atoms in the atmosphere formed inorganic molecules (including H2O and NH3) which interacted to form sugars and then proteins and nucleic acids.
Which country has the greatest contribution for the hole formation in ozone layer?
USA
Germany
Russia
Japan
A.
USA
USA along release 37% of CFCs.
If there are 4 microspore mother cells in an anther, what will be the number of pollen grains?
4
8
12
16
D.
16
Each microspore mother cell divides meiotically to form 4 pollen grains (4 4 = 16).
Radio-tracer technique shows that DNA is in
single-helix stage
double-helix stage
multi-helix stage
none of these
D.
none of these
DNA is a helical structure. It could be through X- ray diffractions patterns of DNA studied by Wilkins and Franklin.
When paternal and maternal chromosomes change their materials with each other in cell division this event is called
synapsis
crossing over
bivalent forming
dyad- forming
B.
crossing over
Crossing over is the mutual exchange of segments of homologous chromatids during first meiotic prophase.
Synapsis is the fusion of chromosome pairs at the start of meiosis.
DNA replication precedes the start of Meiosis I. During Prophase I, homologous chromosomes pair and form synapses. The paired chromosomes are called bivalents and the formation of chiasmata caused by genetic recombination becomes apparent.
Dyad formation is a double chromosome resulting from the splitting of a tetrad during meiosis (germ cell formation).
The 10% energy transfer law of food chain was given by
Stanley
Weismann
Lindemann
Tansley
C.
Lindemann
Only about 10% of the energy is transferred from one trophic level to the next. This 10% law of energy transfer was proposed by Lindemann (1942).
AIDS disease was first reported in
Russia
Germany
USA
France
C.
USA
AIDS was first reported from USA in 1981.
When a natural predator (living being) is applied on the other pathogen organism to control them, this process is called
biological control
genetic engineering
artificial control
confusion technique
A.
biological control
Biological control methods include using natural predators of pests, using resistant varieties, crop rotation etc.
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