How are most of the gases O_2 and CO_2 transported in human blood? A) The O_2 is

Question

How are most of the gases O_2 and CO_2 transported in human blood? A) The O_2 is dissolved in plasma and the CO_2 is held by hemoglobin molecules. B) The O_2 is held by hemoglobin in RBC's, as is the CO_2. C) The O_2 is held by hemoglobin in RBC's and the CO_2 (in the form of bicarbonate ions is dissolved in the plasma. In vertebrate animals, spermatogenesis and oogenesis differ in that A) oogenesis begins at the onset of sexual maturity, whereas spermatogenesis begins during embryonic development. B) oogenesis produces four haploid cells, whereas spermatogenesis produces only one functional spermatozoon. C) cytokinesis is unequal in oogenesis, whereas it is equal in spermatogenesis. Jellyfish and flat worms have highly branched gastrovascular cavities that reach almost all edges of the animals. This elaborate portion of the digestive system allows both animals to function without a(n) A) excretory system B) respiratory system C) circulatory system

Explanation / Answer

13.Ans- c

explanation-

14.Ans-C

Explanation-cytokinesis is unequal in oogenesis, whereas it is equal in spermatogenesis because

Oogenesis occurs within the

follicles of the ovaries. The meiosis of oocytes always results in halpoid

cells of unequal size. When a primary oocyte undergoes meiosis, a large

halpoid secondary oocyte and a very small first polar body result. A second

meiotic division produces a large ootid and a very small second polar body.

The first polar body may or may not divide during the second meiotic

division into two additional second polar bodies. All the polar bodies are

non-functional. After meiosis, the ootid quickly differentiates into the

mature egg cell or ovum. The unequal cytokinesis that occurs has the

advantage of providing the ovum with a much greater amount of cytoplasm and

stored food than if an equal division were to occur. Thus, the non-motile

ovum supplies a developing embryo with most of its cytoplasm and food while

the much smaller but highly-motile sperm contributes mainly genetic

material to the embryo.

15.Ans-c

Explanation- Both jelly fish and flat worms don't have circulatory system also they don't posses respiratory system as well.

Jellyfish are such a unique kind of marine animal that they actually don’t have a specialized circulatory system. . They can easily absorb oxygen when needed through their thin bodies.

Flatworms have no true circulatory or respiratory system, but like all other animals, flatworms do take in oxygen . Extracellular body fluids (interstitial fluids) percolate between cells to help distribute nutrients ,gases , and waste products. Flatworms respire at their integument; gases diffuse directly across their moist outer surface. This type of system is called integumentary exchange.

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