Biology
201. An antibody is made of ________ polypeptide chains?
a. 1
b. 2
c. 3
d. 4
202. 95% of the cytoplasm of RBCs is _________?
a. Hemoglobin
b. Enzymes
c. Salts
d. Other proteins
203. _________ cells of phloem are directly involved in transport of organic solutes?
a. Parenchyma
b. Companion cell
c. Tracheid
d. Sieve element
204. An infectious disorder of respiratory system is __________?
a. Cancer
b. Asthma
c. Tuberculosis
d. Emphysema
205. Cuticular transpiration is _________ of total transpiration?
a. 1-2%
b. 3-4%
c. 5-7%
d. 90%
206. According to cohesion-tension theory, tension is created by __________?
a. Hydrogen bonding
b. Transpiration
c. Adhesion
d. Root pressure
207. Deoxygenated blood first enters in _________ part in fishes?
a. Sinus venosus
b. Right atrium
c. Left atrium
d. Conus arteriosus
208. Ozone depletion occurs commonly due to _________?
a. Carbon dioxide
b. Chlorofluorocarbons
c. UV rays
d. Deforestation
209. Who coined the term CELL?
a. Schwann
b. Schleiden
c. Robert Hook
d. Both a & b
210. "lubb" sound is produced due to _________?
a. Opening of inlet valve
b. Closure of inlet valve
c. Opening of outlet valve
d. Closure of outlet valve
211. In condition of high temperature, following does not occur or occurs at low level ________?
a. Vasodilation
b. Activation of sweat glands
c. Thermogenesis
d. Evaporative cooling
212. Who first observed and thus hypothesized that new cells are formed from previously existing living cell?
a. Theodor Schwann and Schleiden
b. Rudolph Virchow's
c. Louis Pasteur
d. Both a & b
213. In Hardy-Weinberg formula P2 represents frequency of _________?
a. Recessive allele
b. Dominant allele
c. Homozygous dominant individual
d. Homozygous recessive individual
214. ________ supported theory of special creation?
a. Linnaeus
b. Aristotle
c. Mendel
d. Lamarck
215. Percentage of proteins in cell membrane is __________?
a. 20-40%
b. 40-60%
c. 60-80%
d. 80-100%
216. Which of the following is most constant abiotic component of ecosystem _________?
a. Air
b. Water
c. Land
d. Gravity
217. Ecosystem not found in Pakistan is ________?
a. Tropical rain forest
b. Temperate deciduous
c. Grassland
d. Tundra
218. Movement of the material across the cell membrane which does not requiring expenditure of metabolic energy is called _________?
a. Active transport
b. Passive transport
c. Co-transport
d. Counter transport
219. The productivity of aquatic ecosystem is basically determined by light and _______?
a. CO2
b. O2
c. Water
d. Nutrients
220. The first layer of cell wall which is formed is _________?
a. Primary wall
b. Secondary wall
c. Middle lamella
d. All of these
221. Annual rainfall is grassland is about _________?
a. More than 2500 mm
b. 750-1500 mm
c. 250-750 mm
d. Less than 250 mm
222. Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due _________?
a. Rhizobium
b. Nitrosomonas
c. Nitrobacter
d. Pseudomonas
223. Cellulose is the major component of ________?
a. Primary wall
b. Secondary wall
c. Middle lamella
d. All of above
224. Humming bird is an example of ________?
a. Cold blooded animal
b. Ectotherm
c. Endotherm
d. Heterotherm
225. Number of cervical vertebrae is _________?
a. 5
b. 7
c. 9
d. 12
226. Autophagosomes are _________?
a. Those lysosomes which eat parts of their own cells to generate energy
b. Those lysosomes which eat old and worn out cellular organelles
c. Lysosomes which help in extracellular digestion
d. Both an & b
227. Sapwood is formed from ________?
a. Primary xylem
b. Secondary xylem
c. Primary phloem
d. Secondary phloem
228. Which of the following cytoskeletal fiber contain tubulin protein?
a. One which help in assembly of spindles during mitosis
b. One involved in internal cell motion
c. One involved in maintenance of cell shape
d. Both a & b
229. Only myosin is present in _________?
a. A band
b. I band
c. H zone
d. Sarcomere
230. Joints present in skull are example of __________?
a. Fibrous joints
b. Cartilaginous joints
c. Synovial joints
d. Slightly moveable joints
231. The human naked eye can differentiate between two points which are ______ apart?
a. 1.0 mm
b. 0.1 mm
c. 1.0 cm
d. 1.0 dm
232. ________ is a nervous disorder characterized by involuntary tremors, diminished motor power and rigidity?
a. Epilepsy
b. Meningitis
c. Alzheimer's disease
d. Parkinson's disease
233. Of the following which one is not the characteristic of mitochondria?
a. It contains F1 particles
b. It is involved in the synthesis of protein
c. It is a self replicating organelle
d. Number of mitochondria is constant
234. In human female, fertilization commonly occurs at __________?
a. Proximal part of oviduct
b. Distal part of oviduct
c. Uterus
d. Cervix
235. The part of chloroplast where CO2 is fixed to manufacture sugar is ________?
a. Stroma
b. Grana
c. Thylakoid
d. Outer membrane
236. Highest form of learning is _________?
a. Latent learning
b. Insight learning
c. Operant conditioning
d. Instinct
237. Which of the following hormone is polypeptide in nature _________?
a. Insulin
b. Thyroxine
c. ADH
d. Cortisone
238. Ribosomes are assembled in _________?
a. Nucleolus
b. Nucleus
c. DNA
d. RNA
239. Far-red light promotes flowering in _________?
a. Short day plant
b. Long day plant
c. Day neutral plant
d. None of these
240. Which of the following is not present in mitochondria?
a. Enzymes
b. Co-enzymes
c. Ribosomes
d. Thylakoids
241. Secretin inhibits production of ________?
a. Gastric juice
b. Pancreatic juice
c. Bile
d. All of these
242. Yellowish glandular structure which produces progesterone is _________?
a. Graafian follicle
b. Ovary
c. Corpus luteum
d. Placenta
243. The stent energy in the form of ADP is regenerated by mitochondria into ________?
a. AMP
b. ADP
c. ATP
d. All of these
244. On which of the following component of chloroplast chlorophyll is arranged?
a. Cell membrane
b. Matrix
c. Thylakoids
d. Stroma
245. An example of codominance is ________?
a. A' blood group
b. B' blood group
c. O' blood group
d. AB' blood group
246. Test cross is used to find _________?
a. Trait
b. Phenotype
c. Genotype
d. Ratios
247. Number of nuclear pores/nucleus in an RBC are _________?
a. 1/3
b. 3/4
c. 10000
d. 30000
248. Yellow cytoplasm in ascidian gives rise to _________?
a. Epidermis
b. Muscle cells
c. Gut
d. Notochord
249. Chlorophyll molecule contains __________ as central metal ion.
a. Fe2+
b. Mg2+
c. Zn2+
d. Cu2+
250. Okazaki fragments are connected together through action of __________?
a. Primase
b. Polymerase
c. Helicase
d. Ligase
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