Sexual reproduction A) allows animals to conserve resources and reproduce only d
ID: 85569 • Letter: S
Question
Sexual reproduction A) allows animals to conserve resources and reproduce only during optimal conditions. B) can produce diverse phenotypes that may enhance survival of a production in the changing environment C) yields more numerous offspring more rapidly than is possible with sexual reproduction D) enables males and females to remain isolated them each other while rapidly colonizing habits E) guarantees that both parents will provide care for each offspring. Environmental cues that influence the of reproduction generally do to by A) increasing organisms' body temperature. B) providing access to water for external fertilization. C) increasing the ambient temperature to that which is comfortable for sexual reproduction. D) causing direct effects on gonadal structures. E) causing direct effects on hormonal central mechanisms' Animals with reproduction dependent on internal fertilization need all of the following except A) cooperative copulatory behavior B) sophisticated reproduction system. C) compatible reproduction system. D) a moist environment for spawning E) sperm Among human makes, both semen and urine normally travel along the A) vas deferens B) urinary bladder C) seminal vesicle D) estrous E) ureter Increasing the temperature of the human stratum by 2 degree C (i.e. near the normal body care temperature and holding it there would A) reduce the fertility of the man by impairing the production of gonadal steroid hormones. B) reduce the fertility of the man by impairing spermatogenesis C) reduce the man's sexual interest. D) increase the fertility of the affected man by enhancing the rate of sterodogenesis E) have no effect on male reproduction processes. In vertebrate animals, spermatogenesis and cogenesis differ is that A) cogenesis begins at the onset of sexual maturity, whereas spermatogenesis begins during embryonic development. B) cogenesis produces four haploid cells, whereas spermatogenesis produces only one functional spermatoneous. C) cytokinesis is unequal in cogenesis, whereas it is equal in spermatogenes. D) cogenesis ends at menopause, whereas spermatogenesis is finished before births. E) spermatogenesis is not completed until fertilization occurs, but cogenesis is completed by the time a girl is born. The primary difference between estrous and menstrual cycles is that A) the endometrium shed by the uterus during the estrous cycle is reabsorbed, whereas the shed endometrium of menstrual cycles is excreted from the body. B) behavioral change during estrous cycles are much less apparent than those of menstrual cycles. C) season and climate have less-pronounced effects on estrous cycles than they do on menstrual cycles. D) copulation normally occurs across the estrous cycle, whereas in menstrual cycles copulation only occurs during the period surrounding ovulation. E) most estrous cycles are of much longer duration compared to menstrual cycles.Explanation / Answer
Answer 1: B (As explained below)
Sexual reproduction as compared to asexual reproduction has more probability of variation and so diversity is more and the chances of survival of resulting progeny in a changing environment are more.
Answer 2: E (As explained below)
The activity of reproduction is a function of various hormones. Thus, regulation of these hormones is the key to regulation of reproduction. So, environmental cues that influence the timing of reproduction generally impact the mechanisms of the hormones.
Answer 3: D (As explained below)
Spawning as seen in fishes and amphibians is releasing eggs outside the body. For animals with reproduction dependent on internal fertilization this does not matter because the development is not external or outside the body as in the case where eggs are spawned outside and are to be nurtured and cared for by external factors.
Answer 4: D (As explained below)
Urethra is the common tract for release of urine and sperm in human males.
Answer 5: B (As explained below)
The main purpose of the scrotam or scrotal sac is to keep the testes away from the body so that they are not subjected to body heat. Production of sperms is optimum at temperature just below (around 2°C) body temperature.
Answer 6: C (As explained below)
Cytokinesis in oogenesis is meiotic resulting in unequal division of cells, while in spermatogenesis it is mitotic resulting in equal division of cells.
Answer 7: A (As explained below)
The fact that endometrium is absorbed during estrous and excreted during menstruation is one of the several differences between estrous and menstruation cycles. Other differences are that contrary to menstruation, estrous is the period when female is sexually receptive and blood does not flow throughout the entire period in menstruation but it does during estrous.
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