Civil Superior Services — Complete MCQ Bank
CSS is Pakistan’s premier federal competitive examination. Strong preparation requires conceptual clarity, broad general knowledge and consistent practice across compulsory and optional areas.
What is the term for the gradual process of change in the species composition of an ecosystem over time?
Which type of ecological succession begins on bare rock or sand where no soil exists?
What is the term for the variety of different species present in a given habitat?
What is the function of lysosomes in animal cells?
What is the process by which cells engulf large particles by wrapping the cell membrane around them?
Which molecule is the primary energy currency of cells?
What is the term for two different alleles for a trait in an organism?
What is the term for two identical alleles for a trait in an organism?
What is the term for an organism that carries a recessive allele but does not show the trait?
What is the process by which bacteria exchange genetic material through direct contact?