The respiratory structure in insects is the
Insects use a tracheal system with spiracles for respiration, unlike lungs or gills.
The organelle responsible for heredity is
The nucleus contains DNA, which carries hereditary information.
The most evolutionarily advanced animal among the following is
Cockroaches, as insects, have complex structures, making them more advanced.
The lowest category in biological classification is
Species is the most specific taxonomic rank in classification.
Plants showing secondary growth are typically
Dicotyledons have vascular cambium for secondary growth.
Fungi are distinct eukaryotes mainly because they
Fungi lack chlorophyll, distinguishing them from photosynthetic plants.
An arthropod destructive in its early life stage is
Butterfly larvae (caterpillars) damage plants, unlike other options.
An animal body divisible into identical parts along any axis is
Radial symmetry allows identical halves in any plane, e.g., jellyfish.
Which animal possesses mammary glands?
Whales, as mammals, have mammary glands for nursing.
The evolutionary link between birds and reptiles is
Birds and reptiles share scales, a common ancestral trait.
Countershading in animals helps them to
Countershading camouflages animals by balancing light and shadow.
Which plant structure lacks a waterproof cuticle?
Roots lack a cuticle to facilitate water absorption.
In the male mammalian reproductive system, the passage for urine and semen is
The urethra serves as a dual passage in males.
A micronutrient required in minute quantities for plant growth is
Copper is a micronutrient needed in trace amounts.
Which organism is both parasitic and autotrophic?
Sundew photosynthesizes and traps insects, combining autotrophic and parasitic traits.
Hydrochloric acid in the stomach during digestion
HCl creates an acidic environment, stopping ptyalin (salivary amylase).
Which is a polysaccharide?
Cellulose is a complex carbohydrate made of glucose units.
In the kidney, ultrafiltration occurs in the
Bowman’s capsule filters blood to form glomerular filtrate.
Secondary thickening in plants involves
Vascular and cork cambium drive secondary growth in plants.
A fruit developing from a single carpel is
Beans form from a single carpel, unlike multiple-carpel fruits.
Plant growth is artificially stimulated by
Gibberellin promotes stem elongation and growth.
The autonomic nervous system controls
The autonomic system regulates involuntary actions like heart rate.
Temperate plants can grow in tropical zones in
Montane forests have cooler climates suitable for temperate plants.
The water cycle is maintained by
Evaporation and condensation drive the water cycle.
Organisms in estuarine habitats adapt to
Estuarine organisms tolerate varying salinity levels.
Sunken stomata and leaf spines are adaptations for
These features reduce water loss, typical in desert plants.
Animals that rely solely on metabolic water are
Desert animals use metabolic water to survive scarce water.
The first colonizers of bare rock are
Lichens break down rock as pioneer species.
The carrying capacity of a habitat is reached when population growth
Growth slows as resources limit population size.
Abiotic factors controlling human population include
Flooding and earthquakes are abiotic, unlike biotic factors like disease.
An indigenous method to maintain soil fertility is
Crop rotation and shifting cultivation restore soil nutrients.
Water-borne diseases include
Typhoid and cholera are transmitted via contaminated water.
A graph showing cassava plant height illustrates
Height is a continuously varying trait, shown in the graph.
The approximate height of most cassava plants is
The graph’s peak indicates most plants are around 1.6m.
The primary source of energy in an ecosystem is
Sunlight drives photosynthesis, the base of energy flow.
Which blood group is a universal donor?
Group O lacks antigens, making it compatible with all blood types.
The process of nitrogen fixation is carried out by
Nitrogen-fixing bacteria convert atmospheric nitrogen into usable forms.
The structure that anchors a fetus to the placenta is the
The umbilical cord connects the fetus to the placenta for nutrient exchange.
Which hormone regulates blood sugar levels?
Insulin lowers blood sugar by promoting glucose uptake.
The type of reproduction in Amoeba is
Amoeba reproduces asexually by binary fission, splitting into two.
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