MCQOPTIONS
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MCQOPTIONS
This section includes 5751 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1101. |
____ ions help in photolysis of water. |
| A. | Mn++ |
| B. | Mg++ |
| C. | Cl- |
| D. | both (a) and (c) |
| Answer» E. | |
| 1102. |
The enzyme pair common to C3 plants and EMP is |
| A. | cytochrome oxidase and enolase |
| B. | aldolase and triose phosphate isomerase |
| C. | aldolase and enolase |
| D. | phosphoglyceromutase and triose phosphate isomerase |
| Answer» C. aldolase and enolase | |
| 1103. |
In chlorophyll structure four pyrole rings are united with Mg by their atoms of |
| A. | N |
| B. | C |
| C. | H |
| D. | O |
| Answer» B. C | |
| 1104. |
In C4 plants, the bundle sheath cells. |
| A. | have thin walls to facilitate gaseous exchange |
| B. | have large intercellular spaces |
| C. | are rich in PEP carboxylase |
| D. | have a high density of chloroplasts |
| Answer» E. | |
| 1105. |
A. Photosynthestically C4 plants are less efficient then C3 plants.R. The operaion of C4 pathway requires the involvement of only bundle-sheath cells. |
| A. | If Assertion (A) and reason (R) both are correct and R is explanation to A. |
| B. | If (A) and (R) both are correct but (R) is not an explanation to A. |
| C. | If A is true but R is false. |
| D. | If both A and R are false. |
| Answer» E. | |
| 1106. |
The chemical structure of chlorophyll ‘a’ varies from chlorophyll ‘b’ due to difference between. |
| A. | CH3 and C2H5 |
| B. | CH3 and CH2 = CH2 |
| C. | CH3 and CHO |
| D. | CHO and CH2 = CH2 |
| Answer» D. CHO and CH2 = CH2 | |
| 1107. |
The reduction of ADP to ATP occurs by |
| A. | oxidation of water |
| B. | high conc. of H+ ions across the membrane |
| C. | oxidation of NADPH |
| D. | release of electron from PS-II to PS-I |
| Answer» C. oxidation of NADPH | |
| 1108. |
Sugar moves in phloem vessels as ______. |
| A. | cellulose |
| B. | glucose |
| C. | starch |
| D. | sucrose |
| Answer» E. | |
| 1109. |
................... is the by product of photosynthesis. |
| A. | O2 |
| B. | H2O |
| C. | CO2 |
| D. | C6H12O6 |
| Answer» B. H2O | |
| 1110. |
The requirement of assimilatory power to fix 6 molecules of CO2 is |
| A. | 6 ATP, 6 NADPH |
| B. | 12 ATP, 18 NADPH |
| C. | 18 ATP, 18 NADPH |
| D. | 18 ATP, 12 NADPH |
| Answer» E. | |
| 1111. |
In human the unpaired male reproductive structure is ... ... (Kerala PMT 2010) |
| A. | Seminal vesicle |
| B. | Prostate |
| C. | Bulbourethral gland |
| D. | Testes |
| Answer» C. Bulbourethral gland | |
| 1112. |
The goals of animal breeding are..... |
| A. | Extension of reproductive phase of lite. |
| B. | Increase in growth rate. |
| C. | Higher quality for animal products. |
| D. | All above. |
| Answer» E. | |
| 1113. |
Which process is necessary be for producing new geneic variety through plant breeding. |
| A. | Selection of recombinants. |
| B. | Testing new cultivation. |
| C. | Selection and evalution of parents. |
| D. | Testing, release and commercialization of new cultivation. |
| Answer» D. Testing, release and commercialization of new cultivation. | |
| 1114. |
In oogenesis diploid cell produce _______ ovum. (Orrissa-Jee 2008) |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 1115. |
How many secondary spermatocyte will be required to form 400 spermatozoans. (MP PMT 2006) |
| A. | 100 |
| B. | 200 |
| C. | 40 |
| D. | 400 |
| Answer» C. 40 | |
| 1116. |
If after ovulation no pregnancy result the corpus luteum (MP PMT 1990) |
| A. | Is maintained by the presence of progesterone |
| B. | Degenerates in a short time |
| C. | Becomes active and secretes lot of FSH and LH |
| D. | Produces lot of oxytocin and relaxin |
| Answer» C. Becomes active and secretes lot of FSH and LH | |
| 1117. |
In the absence of acrosome the sperm _______. (Kcet 2010) |
| A. | Cannot penetrate the egg |
| B. | Cannot get energy |
| C. | Cannot get food |
| D. | Cannot swim |
| Answer» B. Cannot get energy | |
| 1118. |
The process of delivery of the foetus is called (Kerala-PMT 2010) |
| A. | Parturition |
| B. | Implantation |
| C. | Fertilisation |
| D. | Lactation |
| Answer» B. Implantation | |
| 1119. |
The semini ferous tubules of the testies are lined bye the germinal epithelium consisting... (CPMT 1999, Orrissa-Jee 2011) |
| A. | Cells of sertoli |
| B. | Spermatocytes |
| C. | Spermatogonium |
| D. | Spermatids |
| Answer» B. Spermatocytes | |
| 1120. |
Which of the follwing is an accessory reproductive gland in male mammals. (CPMT 1988, MP PMT 1988) |
| A. | Prostate gland |
| B. | Gastric gland |
| C. | Mushroom shaped gland |
| D. | Inguinal gland |
| Answer» B. Gastric gland | |
| 1121. |
Sperms cells are produced in (Orrissa-Jee 2008) |
| A. | Semini ferous tubule |
| B. | Interstitial space |
| C. | Epididymis |
| D. | Prostate gland |
| Answer» B. Interstitial space | |
| 1122. |
Light reaction of photosynthesis results in formation of ______. |
| A. | O2 |
| B. | NADPH + H+ |
| C. | ATP |
| D. | All of these |
| Answer» E. | |
| 1123. |
During light phase of photosynthesis ______ is oxidized and ______ is reduced. |
| A. | CO2 and Water |
| B. | Water and CO2 |
| C. | Water and NADP |
| D. | NADPH2 and CO2 |
| Answer» D. NADPH2 and CO2 | |
| 1124. |
Glycolytic reversal is a part of ______. |
| A. | aerobic respiration |
| B. | anaerobic respiration |
| C. | light phase of photosynthesis |
| D. | dark phase of photosynthesis |
| Answer» E. | |
| 1125. |
In young leaves ratio of carotene to Xanthophyll is ____. |
| A. | 2 : 1 |
| B. | 3: 1 |
| C. | 1: 3 |
| D. | 1: 2 |
| Answer» E. | |
| 1126. |
The source of CO2 during calvin cycle in C4 plant is |
| A. | Malic acid |
| B. | OAA |
| C. | PEP |
| D. | RuBP |
| Answer» B. OAA | |
| 1127. |
Dicot which follow C4 pathway is____. |
| A. | wheat |
| B. | Amranthus |
| C. | Maize |
| D. | Mango |
| Answer» C. Maize | |
| 1128. |
Which of the following pigments contains open pyrolle ring? |
| A. | Phycobilin |
| B. | Xanthophylls |
| C. | Chlorophylls |
| D. | -carotene |
| Answer» B. Xanthophylls | |
| 1129. |
The oxygen molecule in glucose formed during photosynthesis comes from |
| A. | Water |
| B. | Organic acids |
| C. | CO2 |
| D. | atmosphere |
| Answer» D. atmosphere | |
| 1130. |
Name a plant which do not perform photosynthesis is |
| A. | Algae |
| B. | Bryophyllum |
| C. | cuscutta |
| D. | Pitcher plant |
| Answer» E. | |
| 1131. |
In which of the following light, rate of photosynthesis is maximum? |
| A. | white |
| B. | discontinuous white |
| C. | red |
| D. | blue |
| Answer» C. red | |
| 1132. |
Absorption spectrum of chlorophyll is maximum in _____ light. |
| A. | red |
| B. | blue |
| C. | yellow |
| D. | blue-violet |
| Answer» C. yellow | |
| 1133. |
RuBp carboxylase acts as RuBp carboxygenase at ______ CO2 conc. And ______ O2 conc. |
| A. | low, low |
| B. | low, hig |
| C. | high, high |
| D. | high, low |
| Answer» C. high, high | |
| 1134. |
Solarisation refers to ______. |
| A. | formation of sugar with help of water and energy |
| B. | destruction of chlorophyll |
| C. | synthesis of chl. |
| D. | both b and c |
| Answer» C. synthesis of chl. | |
| 1135. |
Emerson effect proves |
| A. | concept of two photosystem in plant |
| B. | photophosphorylation |
| C. | photorespiration |
| D. | there are light and dark reaction in photosynthesis |
| Answer» B. photophosphorylation | |
| 1136. |
Red pigment in tomato is |
| A. | -carotene |
| B. | Anthocyanin |
| C. | Lycopene |
| D. | Lutein |
| Answer» D. Lutein | |
| 1137. |
The ionized chl.a+ |
| A. | Receives low energy electron |
| B. | Receives high energy electron |
| C. | Expels low energy electron |
| D. | Expels high energy electron |
| Answer» B. Receives high energy electron | |
| 1138. |
Dimorphic chloroplast are present in ______. |
| A. | zea may |
| B. | sacchrum officinale |
| C. | sorghum bicolor |
| D. | all of these |
| Answer» E. | |
| 1139. |
During dark phase of photosynthesis ______ is oxidized and ______ is reduced |
| A. | CO2 and Water |
| B. | Water and CO2 |
| C. | Water and NADP |
| D. | NADPH2 and CO2 |
| Answer» E. | |
| 1140. |
Dark reaction requires light reaction for |
| A. | carboxylation of RUBP |
| B. | regeneration of RuBP |
| C. | reduction of PGA |
| D. | formation of hexose sugar |
| Answer» D. formation of hexose sugar | |
| 1141. |
Quantum yield of photosynthesis is ______. |
| A. | 13.5 % |
| B. | 8 % |
| C. | 13% |
| D. | 12.5% |
| Answer» E. | |
| 1142. |
______ is precursor for abscissic acid (ABA) |
| A. | Zeatin |
| B. | Lutein |
| C. | Violaxanthin |
| D. | Mevalonic acid |
| Answer» D. Mevalonic acid | |
| 1143. |
To produce 3 glucose molecules ______ ATP and ______ NADPH2 molecules are required. |
| A. | 54, 36 |
| B. | 54, 30 |
| C. | 36, 60 |
| D. | 18, 12 |
| Answer» B. 54, 30 | |
| 1144. |
The visible product of photosynthesis is ______. |
| A. | glucose |
| B. | cellulose |
| C. | starch |
| D. | fructose |
| Answer» D. fructose | |
| 1145. |
C55H70O6N4 Mg is |
| A. | An accessory pigment in photosynthesi |
| B. | Present in PS-II |
| C. | Present in all green plants |
| D. | All of these |
| Answer» E. | |
| 1146. |
RUBISCO enzyme is also called as ______. |
| A. | carboxy tetra mutase |
| B. | carboxy di mutase |
| C. | carboxy tri mutase |
| D. | carboxy uni mutase |
| Answer» C. carboxy tri mutase | |
| 1147. |
Which of the following protist is a photoautotroph |
| A. | Thiobacillus |
| B. | Ferrobacillus |
| C. | Diatoms |
| D. | Chlorobium |
| Answer» D. Chlorobium | |
| 1148. |
In non-cyclic photophosphorylation, all the participants acts as electron donor and acceptor except |
| A. | Chl-a of PS I |
| B. | Chl-a of PS II |
| C. | NADP |
| D. | Both (A) and (B) |
| Answer» D. Both (A) and (B) | |
| 1149. |
Photo-oxidation of chlorophyll and cell contents as a result of high light intensity is known as |
| A. | Solarization |
| B. | Photolysis |
| C. | Photperiodism |
| D. | Photorespiration |
| Answer» B. Photolysis | |
| 1150. |
Which one occurs during both cyclic and non-cyclic photophosphorylation |
| A. | Formation of ATP |
| B. | Release of O2 |
| C. | Formation of NADPH2 |
| D. | Involvement of both PSI and PSII |
| Answer» B. Release of O2 | |