The abiotic factors that control human population include
The carrying capacity of a habitat is reached when the population growth begins to
The most likely first colonizers of a bare rock are
Which of the following animals can exist solely on the water they get from food and metabolic reactions?
The presence of stilt roots, pneumatophores, sunken stomata and salt glands are adaptive features of plants found in the
Organisms living in an estuarine habitat are adapted to
Plants of temperate origin can be grown in tropical areas in the vegetation zones of the
The water cycle is maintained mainly by
The autonomic nervous system consists of neurons that control the
Plant growth can be artificially stimulated by the addition of
An example of a fruit that develops from a single carpel is
Which of the following is involved in secondary thickening in plants?
In the kidney of mammals, the site of ultrafiltration is the
Which of the following is a polysaccharide?
A function of the hydrochloric acid produced in the human stomach during digestion is to
Which of the following organisms is both parasitic and autotrophic?
In plants which of the following is required in minute quantities for growth?
In the mammalian male reproductive system, the part that serves as a passage for both urine and semen is the
Which of the following plant structures lacks a waterproof cuticle?
Countershading is an adaptive feature that enables animals to
The feature that links birds to reptiles in evolution is the possession of