MCQOPTIONS
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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 8001. |
During daylight hours, the rate of photosynthesis is higher than that of respiration, and the ratio of oxygen produced to that of consumed is [CPMT 1984] |
| A. | 0.0423611111111111 |
| B. | 0.417361111111111 |
| C. | 2.08402777777778 |
| D. | 0.209027777777778 |
| Answer» C. 2.08402777777778 | |
| 8002. |
In which of the following the rate of photosynthesis is decreased and is known as red drop [MP PMT 1992] |
| A. | Blue light |
| B. | Green light |
| C. | Red light more than 680 nm |
| D. | Red light less than 680 nm |
| Answer» D. Red light less than 680 nm | |
| 8003. |
Which of the following wavelength of light is absorbed maximum for photosynthesis [MP PMT 1990] |
| A. | Red light |
| B. | Blue light |
| C. | Green light |
| D. | Yellow light |
| Answer» C. Green light | |
| 8004. |
If the rate of translocation of food is slow, what will be the effect on photosynthesis [MP PMT 1988] |
| A. | It will increase |
| B. | It will remain same |
| C. | Becomes double |
| D. | It will decrease |
| Answer» E. | |
| 8005. |
In cold and foggy areas, the limiting factor is |
| A. | Temperature |
| B. | Light |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» C. Both [a] and [b] | |
| 8006. |
In presence of cyanide, azide and carbon monoxide, the rate of respiration [MP PMT 1988] |
| A. | Decreases |
| B. | Increases |
| C. | Remains the same |
| D. | None of the above |
| Answer» B. Increases | |
| 8007. |
The rate of respiration of young maturing seeds is quite high but as water contents decreases during further maturation, respiration [DPMT 1986] |
| A. | Remains high |
| B. | Stops completely |
| C. | Increases steadily |
| D. | Decreases steadily |
| Answer» E. | |
| 8008. |
If the nacked pea seeds are kept in four respiratory flasks, they would germinate best in the flask which contains [BHU 1982] |
| A. | Carbon dioxide |
| B. | Oxygen |
| C. | Hydrogen |
| D. | Nitrogen |
| Answer» C. Hydrogen | |
| 8009. |
\[C{{O}_{2}}\]concentration has which relation with respiration |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Both [a] and [b] |
| D. | No relation |
| Answer» C. Both [a] and [b] | |
| 8010. |
If oxygen contents is reduced to 1%, the rate of respiration becomes |
| A. | Optimum |
| B. | Minimum |
| C. | Maximum |
| D. | None of the above |
| Answer» C. Maximum | |
| 8011. |
In presence of dilule salt solution, rate of respiration in a respiring tissue |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of the above |
| Answer» B. Decreases | |
| 8012. |
The potato growing in hilly areas is bigger in size due to |
| A. | High rate of photosynthesis at high altitude |
| B. | Low rate of respiration at high altitude |
| C. | Due to formation of more fat |
| D. | None of the above |
| Answer» C. Due to formation of more fat | |
| 8013. |
The graph shows the relation between light intensity and the giving off and taking up of carbon dioxide by the leaves of a plant. Why is most carbon dioxide given off when the light intensity is zero units [Kerala PMT 2004] |
| A. | Because it is just the start of the experiment |
| B. | Only respiration is taking place at this intensity of light |
| C. | Only photosynthesis is taking place at this intensity of light |
| D. | The rate of photosynthesis is equivalent to the rate of respiration |
| E. | The rate of photosynthesis is more than the rate of respiration |
| Answer» C. Only photosynthesis is taking place at this intensity of light | |
| 8014. |
When an unripe banana is sealed in a polythene bag, it remains green for many days. But if an apple is also sealed in the same bag, the banana ripens and turns yellow within a few days. The reason is that apple [BHU 1994] |
| A. | Removes\[{{O}_{2}}\]released by the banana and thus promotes ripening |
| B. | Produces\[C{{O}_{2}}\]which promotes ripening |
| C. | Removes\[C{{O}_{2}}\]which inhibits ripening |
| D. | Releases ethylene which promotes ripening |
| Answer» E. | |
| 8015. |
If the temperature is increased (above\[{{35}^{o}}C\]) [CPMT 1991] |
| A. | Rate of decline of respiration will be earlier than decline of photosynthesis |
| B. | Rate of decline of photosynthesis will be earlier than decline of respiration |
| C. | Both decline simultaneously |
| D. | Both do not show any fixed pattern |
| Answer» C. Both decline simultaneously | |
| 8016. |
Which statement is wrong [CBSE PMT 1989] |
| A. | Stomatal opening is influenced by many factors and potassium |
| B. | All enzymes are proteins but all proteins are not enzymes |
| C. | All angiosperms are with seeds but all seed plants are not angiosperms |
| D. | Factors which effect the respiration influence the photosynthesis but reverse is not possible |
| Answer» E. | |
| 8017. |
During injury and infection, the rate of\[{{O}_{2}}\]consumption |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 8018. |
Allantois develops from the embryonic |
| A. | Fore gut |
| B. | Mid gut |
| C. | Hind gut |
| D. | Tail region |
| Answer» D. Tail region | |
| 8019. |
The shock absorber fluid of the developing embryo is known as [DPMT 1993] |
| A. | Chorionic fluid |
| B. | Amniotic fluid |
| C. | Allantoic fluid |
| D. | Coelomic fluid |
| Answer» C. Allantoic fluid | |
| 8020. |
Urinary bladder of the embryo is or Which is the urinary bladder of child placed in the womb [MP PMT 1995] |
| A. | Yolk sac |
| B. | Allantois |
| C. | Amnion |
| D. | Chorion and allantois both |
| Answer» C. Amnion | |
| 8021. |
The respiratory function of embryo is performed by |
| A. | Chorion |
| B. | Amnion |
| C. | Allantois |
| D. | Yolk sac |
| Answer» D. Yolk sac | |
| 8022. |
The allantois has the similar layers as present in the yolk sac. These are |
| A. | Outer mesoderm and inner endoderm |
| B. | Outer endoderm and inner mesoderm |
| C. | Outer endoderm and inner ectoderm |
| D. | Outer endoderm and inner endoderm |
| Answer» B. Outer endoderm and inner mesoderm | |
| 8023. |
All extra embryonic membranes |
| A. | Take part in the formation of embryo |
| B. | Does not take part in the embryo formation |
| C. | Form the placenta |
| D. | Perform the function of excretion of embryo |
| Answer» C. Form the placenta | |
| 8024. |
Thickness of vitelline membrane is about |
| A. | \[10{AA}\] |
| B. | \[30{AA}\] |
| C. | \[50{AA}\] |
| D. | \[60{AA}\] |
| Answer» C. \[50{AA}\] | |
| 8025. |
The extra embryonic membranes of the mammalian embryo are derived from [BHU 1999; 2004] |
| A. | Formative cells |
| B. | Follicle cells |
| C. | Trophoblast |
| D. | Inner cell mass |
| Answer» D. Inner cell mass | |
| 8026. |
The number of foetal membranes in man is [MP PMT 2002] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 0 |
| Answer» D. 0 | |
| 8027. |
The function of amniotic cavity is [MP PMT 1999] |
| A. | Respiraiton |
| B. | Protection from desiccation and shocks |
| C. | Protection from desiccation |
| D. | Protection from shocks |
| Answer» C. Protection from desiccation | |
| 8028. |
Function of allantois in mammal is [AIIMS 1984; MP PMT 1996, 99] |
| A. | Respiration only |
| B. | Excretion |
| C. | Nutrition, excretion and respiration |
| D. | Protection from shocks |
| Answer» D. Protection from shocks | |
| 8029. |
The foetal membrane which is the source of first blood corpuscle to enter the circulation of the embryo is called [MP PMT 1995] |
| A. | Amnion |
| B. | Chorion |
| C. | Trophoblast |
| D. | Yolk sac |
| Answer» E. | |
| 8030. |
Chorion is composed of |
| A. | Cytotrophoderm |
| B. | Syncytial trophoblast |
| C. | Outer ectoderm and somatic mesoderm |
| D. | All the above |
| Answer» D. All the above | |
| 8031. |
Amniotic fluid protects the foetus from [BHU 1982, 85] |
| A. | Degeneration |
| B. | Jerks |
| C. | Encystment |
| D. | None |
| Answer» C. Encystment | |
| 8032. |
Which of the following is an embryonic connective tissue |
| A. | Endometrium |
| B. | Mediastinum |
| C. | Mesenchyme |
| D. | Endothelium |
| Answer» D. Endothelium | |
| 8033. |
The plasma membrane of oocyte and that of follicle cells show close connections at some points in the form of |
| A. | Microvilli |
| B. | Desmosomes |
| C. | Cytoplasmic processes |
| D. | None of the above |
| Answer» C. Cytoplasmic processes | |
| 8034. |
In mammals the chorion and the allantois together form [MP PMT 1994] |
| A. | Placenta |
| B. | Endometrium |
| C. | Uterus |
| D. | Yolk sac |
| Answer» B. Endometrium | |
| 8035. |
Amniotic fluid is found in |
| A. | Uterus |
| B. | Scrotal sac |
| C. | Kidney |
| D. | Liver |
| Answer» B. Scrotal sac | |
| 8036. |
The amniotic fluid is taken out with the help of surgical needle and separation of the embryo cells present in this fluid is done by |
| A. | Amniotic fluid study |
| B. | Amniocentesis |
| C. | Centrifugation |
| D. | None of these |
| Answer» D. None of these | |
| 8037. |
Amnion helps in [MP PMT 1994, 96; BHU 1985] |
| A. | Respiration |
| B. | Excretion |
| C. | Nutrition |
| D. | Protection from shocks |
| Answer» E. | |
| 8038. |
The main function of tropho ectoderm in mammalian embryo is [Kerela CET 2003] |
| A. | Protection of the developing cells |
| B. | Drawing food for the developing cells |
| C. | Formation of yolksac |
| D. | Formation of body of developing embryo |
| Answer» C. Formation of yolksac | |
| 8039. |
In man the foetal membrane which forms the intimate connection with the uterine tissue is [MP PMT 2002, 03] |
| A. | Amnion only |
| B. | Chorion only |
| C. | Allantois only |
| D. | Allanto-chorionic structure |
| Answer» C. Allantois only | |
| 8040. |
The embryo of man is protected by [AFMC 1986; DPMT 1993] |
| A. | Amniotic cavity |
| B. | Peritoneal cavity |
| C. | Pleural cavity |
| D. | Allantois |
| Answer» B. Peritoneal cavity | |
| 8041. |
The experimental material that has largely been responsible for making rapid advances in research on photosynthesis is [CPMT 1985; RPMT 2002] |
| A. | Chlamydomonas |
| B. | Spinach leaf |
| C. | Chlorella |
| D. | Hydrilla |
| Answer» D. Hydrilla | |
| 8042. |
During photosynthesis, the oxygen in glucose comes from [DPMT 1982, 83; CPMT 1972, 81; MP PMT 1984] |
| A. | Water |
| B. | Carbon dioxide |
| C. | Both from\[C{{O}_{2}}\]and water |
| D. | Oxygen in air |
| Answer» C. Both from\[C{{O}_{2}}\]and water | |
| 8043. |
Discovery of Emerson effect has clearly shown the existence of [MP PMT 1987; BHU 1979] |
| A. | Two distinct photochemical reactions or processes |
| B. | Light and dark reactions in photosynthesis |
| C. | Photophosphorylation |
| D. | Photorespiration |
| Answer» B. Light and dark reactions in photosynthesis | |
| 8044. |
McAlister and Mayer have studied the Warburg's effect on |
| A. | Pea |
| B. | Arachis |
| C. | Soyabean |
| D. | All the above |
| Answer» D. All the above | |
| 8045. |
Which of the following is obtained from\[C{{O}_{2}}\]during glucose manufacture |
| A. | Oxygen |
| B. | Carbon |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» D. None of the above | |
| 8046. |
During formation of glucose which of the following is obtained from water |
| A. | Oxygen |
| B. | Hydrogen |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» C. Both [a] and [b] | |
| 8047. |
Pastur's effect is [Wardha 2005] |
| A. | Stoppage of fermentation in presence of oxygen |
| B. | Increase in fermentation in presence of oxygen |
| C. | Decrease in fermentation in presence of oxygen |
| D. | No effect on fermentation |
| Answer» B. Increase in fermentation in presence of oxygen | |
| 8048. |
Engelmann's experiment with Spirogyra demonstrated that [BVP 2003] |
| A. | The full spectrum of sunlight is needed for photosynthesis |
| B. | Only red wavelengths are effective in causing photosynthesis |
| C. | Only blue wavelengths are effective |
| D. | Both blue and red wavelengths are effective |
| Answer» E. | |
| 8049. |
Variegated leaves of a plant were supplied with radioactive carbon dioxide (nothing\[^{14}C{{O}_{2}}\]) during an experiment. Leaf X was kept in the dark and leaf Y was kept in the light. At the end of the experiment the radioactivity in the leaves was measured and found to be as shown on the diagram below. What is the most likely explanation for the level of radioactivity found in the yellow zone of Y [BVP 2003] |
| A. | Photosynthesis occurs but no storage of starch occurs in this zone |
| B. | Radioactive carbon dioxide diffuses into the leaf and accumulates here |
| C. | Products of photosynthesis diffuse into the yellow zone |
| D. | Photosynthesis proceeds slowly in the absence of chlorophyll a and b |
| Answer» D. Photosynthesis proceeds slowly in the absence of chlorophyll a and b | |
| 8050. |
Path of carbon in photosynthesis was found by using [Kerala CET 2002] |
| A. | Centrifugation |
| B. | Radio isotopes |
| C. | Fractionation |
| D. | Chromatography |
| Answer» C. Fractionation | |