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.
| 1951. |
Cohesive force of water is due to (EAMCET 1989, EPMT 2005) |
| A. | O-bond |
| B. | OH-bonds |
| C. | S-bonds |
| D. | H-bonds |
| Answer» D. H-bonds | |
| 1952. |
Which contributes most to the transport of water from soil to the leaves of a tree ? (CPMT 1989, MPPMT 1989) |
| A. | Root pressure |
| B. | Cohesion of water and transpiration pull |
| C. | Capillary rise of water inside xylem |
| D. | Hydrolysis of ATP |
| Answer» E. | |
| 1953. |
Diffusion of water through selectively permeable membrane is (CPMT 1993) |
| A. | Diffusion |
| B. | Imbibation |
| C. | Osmosis |
| D. | Translocation |
| Answer» D. Translocation | |
| 1954. |
Transpiration is regulated by movement of (JIMER 2004) |
| A. | Guard cell |
| B. | Subsidiary cells |
| C. | Epidermal cells |
| D. | Mesophyll cells |
| Answer» C. Epidermal cells | |
| 1955. |
Plasmolysis is due to (CPMT 1995) |
| A. | Exosmosi |
| B. | Endosmosis |
| C. | Osmosis |
| D. | Adsorption |
| Answer» D. Adsorption | |
| 1956. |
With rise in turgidity, wall pressure will (CBSE 1997) |
| A. | Decrease |
| B. | Increase |
| C. | Fluctuate |
| D. | Remain unchanged |
| Answer» B. Increase | |
| 1957. |
Transpiration is high in (MP PMT 1993) |
| A. | Rainy season |
| B. | Winter |
| C. | High temperature |
| D. | Low wind velocity |
| Answer» E. | |
| 1958. |
The movement of free atoms from higher concentration to lower concentration is called. (RPMT 1995) |
| A. | Osmosi |
| B. | Diffusion |
| C. | Endosmosis |
| D. | Exosmosis |
| Answer» B. Diffusion | |
| 1959. |
Potometer is an instrument that measures (Pb. PMT 1998, Manipur 2005) |
| A. | Respiration |
| B. | Photosynthesis |
| C. | Growth |
| D. | Transpiration |
| Answer» E. | |
| 1960. |
Conversion of starch to organic acids is required for (CBSE 1992) |
| A. | Stomatal opening |
| B. | Stomatal closing |
| C. | Stomatal formation |
| D. | Stomatal activity |
| Answer» D. Stomatal activity | |
| 1961. |
Element involved in stomatal regulation its opening and closing is(CPMT 1989, 2004, Kerala 2000, Manipal 2001, Pb. PMT 2001, Uttrakhant 2001, DPMT 2002, Wardha 2003, 2011, AMU 2005) |
| A. | Zinc |
| B. | Magnesium |
| C. | Potassium |
| D. | Iron |
| Answer» B. Magnesium | |
| 1962. |
The principal pathway of water translocation in angiospermis is (CBSE 1990) |
| A. | Sieve cell |
| B. | Sieve tube elements |
| C. | Xylem vessel system |
| D. | Xylem and phloem |
| Answer» C. Xylem vessel system | |
| 1963. |
Which pathway involves cell wall and inter cellular spaces ? (COMED-K’s 2010) |
| A. | Vascular pathway |
| B. | Protoplast pathway |
| C. | Symplast pathway |
| D. | Apoplast pathway |
| Answer» E. | |
| 1964. |
Cotton fibres dipped in water absorb water through (RPMT 1996) |
| A. | Endosmosi |
| B. | Exosmosis |
| C. | Capillarity |
| D. | Imbibition |
| Answer» C. Capillarity | |
| 1965. |
The space between plasma membrane and cell wall of a plasmolysed cell surrounded by a hypertonicsolution is occupied by (KCET 2011) |
| A. | Isotonic solution |
| B. | Hypotonic solution |
| C. | Hypertonic solution |
| D. | Water |
| Answer» E. | |
| 1966. |
Rate of transpiration is highest when (JKCMEE 2000) |
| A. | Soil is wet and air is dry |
| B. | Soil is wet and air is hunid |
| C. | Soil is dry and air is humid |
| D. | Both soil and air are dry. |
| Answer» D. Both soil and air are dry. | |
| 1967. |
Water absorption by root hairs occurs untill (COMED-K’s 2010) |
| A. | Concentration of water in the cell sap is higher |
| B. | Salt concentration in cell sap is higher |
| C. | They are separated from the soil by a selectively permeable membrane |
| D. | Water potential is lower |
| Answer» C. They are separated from the soil by a selectively permeable membrane | |
| 1968. |
2% Nacl as compared to 18% glucose solution is |
| A. | Isotonic |
| B. | Hypotonic |
| C. | Hypertonic |
| D. | None of the above |
| Answer» E. | |
| 1969. |
Adding solute to pure water will cause development of (MPPMT 2001) |
| A. | Positive water potential |
| B. | More positive water potential decreases Ψ S |
| C. | More negative water potential will not change Ψ S |
| D. | Negative water potential |
| Answer» B. More positive water potential decreases Ψ S | |
| 1970. |
Guard cells regulate (Orissa 2008, CBSE 2009) |
| A. | Respiration |
| B. | Transpiration |
| C. | Photosynthesis |
| D. | Photorespiration |
| Answer» C. Photosynthesis | |
| 1971. |
Cell wall shows (Manipur 2007) |
| A. | Semi permeability |
| B. | Differential permeability |
| C. | Complete permeability |
| D. | Impermeability |
| Answer» B. Differential permeability | |
| 1972. |
Stomata open during day time due to (Wardha 2005) |
| A. | Decrease in pH |
| B. | Decrease in weater potential |
| C. | Increase in water potential |
| D. | Light |
| Answer» B. Decrease in weater potential | |
| 1973. |
Glucose is not stored in plants due to its effect in |
| A. | Decrease in osmotic pressure |
| B. | Increase in osmotic pressure |
| C. | Increase in turgor pressure |
| D. | Decreas in turgor pressure |
| Answer» D. Decreas in turgor pressure | |
| 1974. |
The process by which water is absorbed by solids like colloids causing them to increase in volume is |
| A. | Facilitated diffusion |
| B. | Diffusion |
| C. | Osmosis |
| D. | Imbibation |
| Answer» C. Osmosis | |
| 1975. |
Stomata of CAM plants (CBSE 2003) |
| A. | Are always open |
| B. | Open during the day and close at might |
| C. | Open during night and close during the day |
| D. | Nerve open |
| Answer» B. Open during the day and close at might | |
| 1976. |
In tall trees water is absorbed due to (Manipal 2005, Guj. CET 2011) |
| A. | Transpiration |
| B. | Root pressure |
| C. | Capillary action |
| D. | Photosynthesis |
| Answer» C. Capillary action | |
| 1977. |
Tracheids are less efficient than vessels due to (MHT, CET 2011) |
| A. | Absense of closed end wall |
| B. | Uneven thickeningS |
| C. | Caspirian strips |
| D. | Presence of tapering end walls |
| Answer» D. Presence of tapering end walls | |
| 1978. |
Which one is responsible for opening of stomata ? (Guj. CET 2006) |
| A. | Decrease in CO2 concentration and increse in H+ ion concentration. |
| B. | Decrease in CO2 cone and decrease in H+ ion concentration. |
| C. | Increase in CO2 cone and increase in H+ ion cone. |
| D. | More free H+ ions and less Cl- ions. |
| Answer» D. More free H+ ions and less Cl- ions. | |
| 1979. |
Major loss of water in transpiration occurs through (MHT, CET 2009) |
| A. | Cuticle |
| B. | Bark |
| C. | Hydathodes |
| D. | Stomata |
| Answer» B. Bark | |
| 1980. |
A negative effect of transpiration is (Guj. CET 2010) |
| A. | Development of water stres |
| B. | Increase in mineral absorption |
| C. | Maintanance of leaf temperature |
| D. | Causing cooling |
| Answer» E. | |
| 1981. |
Starch of guard cells is converted into PEP through. (Guj. CET 2008) |
| A. | Hydrolysi |
| B. | Oxidation |
| C. | Dephosphorylation |
| D. | Decarboxylation |
| Answer» D. Decarboxylation | |
| 1982. |
Most water flow in root occurs via apoplast as (AMV 2009) |
| A. | Cortical cells are living cells |
| B. | Cortical cells are loosely arranged |
| C. | Cortical cells are thin walled |
| D. | All the above |
| Answer» E. | |
| 1983. |
Sotmatal opening is influenced by |
| A. | N2 concentration, CO2 concentration, light |
| B. | CO2 concentration, temperature, light |
| C. | N2 concentration, light, temperature |
| D. | CO2 concentration, N2 concentration, temperature |
| Answer» E. | |
| 1984. |
Match the columns : |
| A. | (a)-(2), |
| B. | -(1), |
| C. | -(4), |
| D. | -(3) |
| Answer» D. -(3) | |
| 1985. |
Choose the correct combination of labelling in potato osmoscope. (Manipal PMT 2004) |
| A. | a-final level, b-dot pin, c-initial level, d-sugar solution, e-potato tuber |
| B. | a-initial level, b-dot pin, c-final level, d-water, e-potato tuber |
| C. | a-final level, b-dot pin, c-initial level, d-water, e-potato tuber |
| D. | a-final level, b-dot pin, c-initial level, d- water, e-container |
| Answer» C. a-final level, b-dot pin, c-initial level, d-water, e-potato tuber | |
| 1986. |
Whose water potential is less than water potential of root hair during water absorption by root hair. (Guj. CET 2011) |
| A. | Gravitational water |
| B. | Pure water |
| C. | Vacuolar sap |
| D. | Soil solution\ |
| Answer» E. | |
| 1987. |
Wind pollination requires that the pollen grains are |
| A. | Heavy and we |
| B. | Heavy and non-sticky |
| C. | Light and dry |
| D. | Heavy and sticky |
| Answer» D. Heavy and sticky | |
| 1988. |
Energy source responsible for upward flow of water is (COMED K’s -2008) |
| A. | ATP |
| B. | Sucrose |
| C. | Solar heat |
| D. | Light |
| Answer» C. Solar heat | |
| 1989. |
The hilum of the ovule represents the junction between |
| A. | Nucellus and Embryo |
| B. | Nucellus and Integuments |
| C. | Funicle and Integuments |
| D. | Funicle and ovule |
| Answer» E. | |
| 1990. |
What causes opening of stomata (Guj. CET 2010) |
| A. | Thin wall of guard cell facing stomatal pore is stretched more, curves in and the pore opens. |
| B. | Thick wall of guard cell facing stomatal pore is stretched more, moves in and pore opens. |
| C. | As thin wall of guard cell is stretched less, the guard cell wall facing the stomatal pore moves in and pore opens. |
| D. | Thick wall of guard cell facing the stomatal pore is strectched less, moves, in and the pore opens. |
| Answer» D. Thick wall of guard cell facing the stomatal pore is strectched less, moves, in and the pore opens. | |
| 1991. |
Pro-embryo is a |
| A. | 8 celled structure |
| B. | 4 celled structure |
| C. | 2 celled structure |
| D. | 16 celled structure |
| Answer» C. 2 celled structure | |
| 1992. |
A sterile region present between stigma and ovary is called |
| A. | Pollen tube |
| B. | Style |
| C. | Filament |
| D. | Suspensor |
| Answer» C. Filament | |
| 1993. |
The plant part which consist of two generations, one within the other, is |
| A. | Germinated pollen grain |
| B. | Embryo |
| C. | Unfertilized ovule |
| D. | Seed |
| Answer» D. Seed | |
| 1994. |
Which one of the following floats in the cytoplasm of the vegetative cell ? |
| A. | Male gamete |
| B. | Generatic cell |
| C. | Female gamete |
| D. | Microspore |
| Answer» C. Female gamete | |
| 1995. |
Out of the four sets of appendages of a typical flower the outer two sets are |
| A. | Fertile |
| B. | Reproductive |
| C. | Sterile |
| D. | Filamentous |
| Answer» D. Filamentous | |
| 1996. |
The asexual production of seed is called |
| A. | Fragmentation |
| B. | Apomixis |
| C. | Self-fertilization |
| D. | Dormancy |
| Answer» C. Self-fertilization | |
| 1997. |
Perisperm is |
| A. | Peripheral part of endosperm |
| B. | Remnent of endosperm |
| C. | Disintegrated secondary nucleus |
| D. | persistant of nucleus |
| Answer» E. | |
| 1998. |
In the flowering plants, male and female gametes both are |
| A. | Motile |
| B. | Non-motile |
| C. | Diploid |
| D. | Very large |
| Answer» C. Diploid | |
| 1999. |
Suspensor is made up of |
| A. | 2 to 4 cell |
| B. | 4 to 8 cells |
| C. | 8 to 16 cells |
| D. | 20 to 25 cells |
| Answer» E. | |
| 2000. |
Which layer of the wall of microsporangium is made up of Fibrous layer |
| A. | Middle layer |
| B. | Endothecium |
| C. | Tapetum |
| D. | Epidermis |
| Answer» C. Tapetum | |