Biology question (2)

The nucleus is considered  the control organelle of a cell because itA.   contains the genetic material B. contains the nuclear sap C. is bounded by the nuclear membraneD. is located at the centre  of the cell. (A)
2.The  procaryotic cell type is characterized  by aA. complex cytoplasm in which different regions are     poorly defined . B. localization of differ regions of     the cell into tissues. C. collection of organelles and     macromolecular complexes    D. simple cytoplasm     with well-defined  regions.(A)
3.The natural tendency of organism as they evolve is toA. decrease in size B. increase in number  C. develop      specialized structures  D. feed indiscriminately. (C)
4.In snails, the hard calcareous shells are secreted by theA. radula    B. ctendium     C. pneumostome   D. mantle (A)
5.The ability of the cockroach to live in cracks and crevices  is enhanced by the possession ofA.  wings and  segmented body     B. compound eyesC.   claws on the legs   D. dorso-ventrally flattened body. (D)
6.The case of termites that lacks  pigmentation is theA. kingB. worker     C. solder     D. queen. (D)
7.The structures that prevent food particles fromescaping through the fish gills are called gillA.  arches B. filaments C. rakers D. lamellae.(C)
8.A distinguishing feature of mammals is the possession ofA. skinB. scaleC. nailD. hair.(D)
9.Which of the following structures is capable ofproducing more tissues in the stem of a herbaceousflowing plant?A. Epidermis B. Pericycle C. Xylem D. Cambium.
10.The manufacture of carbohydrates by  plants takesplace only inA.  the leaves     B. the green stemsC.    chlorophylous      parts D. flowering plants (C)
11.In a water culture experiment, a plant showed poorgrowth and yellowing of the leaves. These may be dueto deficiency of A. copper    B. iron      C.  magnesium     D.  calcium.
12In million’s test, when the reagent is added to a proteinfood item, a white precipitate is produced which turnsA   blue on heating      B.     yellow on heatingC.  green on heating    D.     red on heating.
13Regulation of blood sugar level  takes place in theA. pancreas    B.  ileumC. liver.    D. kidney.
14Unicellular organisms transport essential nutrientsdirectly to all parts of their bodies by the process ofdiffusion because, they haveA. a large volume to surface area ratio     B. a large s        urface area to volume ratio C. their bodies  immersed      in the nutrients   D. their outer membrane made of      cellulose.
15.The heat of the adult frog consists ofA.   two auricles and two ventricles B. one auricle and       one ventiricle   B. one  auricle and one ventricleC.   two ventricles and one auriclesD. one ventricle      and two auricles.