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.
| 2001. |
The root cell of wheat plant has 42 chromosomes. What would be the number of chromosomes in the synergid cell ? |
| A. | 21 |
| B. | 7 |
| C. | 28 |
| D. | 14 |
| Answer» B. 7 | |
| 2002. |
Root cap of the embryo develops from |
| A. | Basal cell |
| B. | Apical cell |
| C. | Hypophysis |
| D. | Hypocotyl |
| Answer» D. Hypocotyl | |
| 2003. |
The opposite end of the micropylar region of an ovule is called |
| A. | Embryo sac |
| B. | Nucellus |
| C. | Chalaza |
| D. | Thalamus |
| Answer» D. Thalamus | |
| 2004. |
The mature pollen grain contains |
| A. | 3 cell |
| B. | 7 cells |
| C. | 2 cells |
| D. | 1 cell |
| Answer» D. 1 cell | |
| 2005. |
A single ovule produces |
| A. | 3 female gamete |
| B. | 1 female gamet |
| C. | 2 female gamete |
| D. | 4 female gamete |
| Answer» C. 2 female gamete | |
| 2006. |
Future sporophytic generation in a seed is |
| A. | Cotyledon |
| B. | Endosperm |
| C. | Hypocotyl |
| D. | Embryo |
| Answer» E. | |
| 2007. |
The arrangement of the ρ haploid nuclei in the normal dicot embryo sac is |
| A. | 2 + 3 + 3 |
| B. | 2 + 3 + 2 |
| C. | 3 + 3 + 2 |
| D. | 3 + 2 + 3 |
| Answer» C. 3 + 3 + 2 | |
| 2008. |
Scatelum is |
| A. | an endosperm |
| B. | a seed coat |
| C. | an embryo |
| D. | a cotyledon |
| Answer» E. | |
| 2009. |
A proximal sterile part of the stamen is called |
| A. | Style |
| B. | Connective |
| C. | Anther |
| D. | Filament |
| Answer» E. | |
| 2010. |
The loss of water in form of water drops is called. |
| A. | Transpiration |
| B. | Respiration |
| C. | Guttation |
| D. | Exosmosis |
| Answer» D. Exosmosis | |
| 2011. |
When pollen grains are not transferred from anthers to stigma in a flower, due to the physical barrier,it is called |
| A. | Cleistogamy |
| B. | Herkogamy |
| C. | Dichogamy |
| D. | Heterogamy |
| Answer» C. Dichogamy | |
| 2012. |
Embryo sac is formed inside |
| A. | Seed |
| B. | Endosperm |
| C. | Embryo |
| D. | Ovule |
| Answer» E. | |
| 2013. |
Plants with scotoactive stomata perform |
| A. | C4 photosynthesi |
| B. | CAM photosynthesis |
| C. | C3 photosynthesis |
| D. | An oxygenic photosynthesis |
| Answer» C. C3 photosynthesis | |
| 2014. |
The phenomenon related to active water absorption is |
| A. | Transpiration |
| B. | Root pressure |
| C. | Osmotic pressure |
| D. | Translocation |
| Answer» C. Osmotic pressure | |
| 2015. |
Pollen tube is formed by |
| A. | Germ pore |
| B. | Exine |
| C. | Style |
| D. | Intine |
| Answer» E. | |
| 2016. |
The pollen tube usually enters the female gametophyte |
| A. | through one of the synergid |
| B. | by directly penetrating the egg |
| C. | between one synergid and central cell |
| D. | by knocking off the antipodal cell |
| Answer» B. by directly penetrating the egg | |
| 2017. |
Root pressure is unable to explain the ascent of sap because it is not found in |
| A. | Bryophyte |
| B. | All plants in all reasons |
| C. | Trees |
| D. | Spring |
| Answer» B. All plants in all reasons | |
| 2018. |
In xylem, the ascent of sap takes place in |
| A. | Tracheids with associated xylem parenchyma |
| B. | Xylem parenchyma |
| C. | Walls of tracheary elements |
| D. | Lumen of tracheary elements |
| Answer» C. Walls of tracheary elements | |
| 2019. |
For keeping stomata open, besides K+ ions the guard cells require a constant supply of |
| A. | ABA |
| B. | ATP |
| C. | Organic acid |
| D. | Protons |
| Answer» C. Organic acid | |
| 2020. |
During high wind velocity, the stomata |
| A. | open more widely |
| B. | Close down |
| C. | Remian unaffected |
| D. | Remain unaffected but lose more water due to mass action |
| Answer» C. Remian unaffected | |
| 2021. |
Root pressure theory of ascent of sap is unacceptable because |
| A. | Water can ascend without root or root pressure |
| B. | Root pressure cannot explain ascent of sap beyond 10 metres. |
| C. | Root pressure is more during early morning than afternoon. |
| D. | Root pressur does not occur in spring. |
| Answer» B. Root pressure cannot explain ascent of sap beyond 10 metres. | |
| 2022. |
Water tightly held to soil particles is called (EAMCET 1996) |
| A. | Bound water |
| B. | Capillary water |
| C. | Hygroscopic water |
| D. | Runaway water |
| Answer» D. Runaway water | |
| 2023. |
Root pressure can be demonstrated by means of |
| A. | wilting |
| B. | Guttation |
| C. | Transpiration |
| D. | Exudation |
| Answer» E. | |
| 2024. |
The maximum absorption of water by roots occurs in the (region) zone of |
| A. | Root cap |
| B. | Cell division |
| C. | Cell elongation |
| D. | Root hairs |
| Answer» E. | |
| 2025. |
Scotoactive movement of stomata is that |
| A. | Stomata open at night |
| B. | Stomata open during day |
| C. | Stomata close at night |
| D. | Stomata open both during day and night |
| Answer» B. Stomata open during day | |
| 2026. |
Ascent of sap is |
| A. | Upward movement of water in the plant |
| B. | Downward movement of organic nutrients |
| C. | Upward and downward movement of water in the plant |
| D. | Redistribution of inorganic substances in the plant |
| Answer» E. | |
| 2027. |
Rate of transpiration is inversely related to |
| A. | Humidity |
| B. | Light |
| C. | Temperature |
| D. | Water |
| Answer» B. Light | |
| 2028. |
Transpiration is a process related to |
| A. | Osmosi |
| B. | Diffusion |
| C. | Activated transport |
| D. | Facilitated diffusion |
| Answer» C. Activated transport | |
| 2029. |
In isobilateral leaf, the number of stomata per unit area are. |
| A. | More on upper surface |
| B. | More on lower surface |
| C. | Approximately same on both the surfaces |
| D. | Absent on both the surfaces |
| Answer» D. Absent on both the surfaces | |
| 2030. |
The phenomenon which forces water upward into tracheal elements of xylem in the root region is |
| A. | Transpiration |
| B. | Root pressure |
| C. | Turgor pressure |
| D. | Imbibation pressure |
| Answer» C. Turgor pressure | |
| 2031. |
As absorbed water passes towards vascular cylinder, it must enter the cytoplasm of |
| A. | Pericycle cell |
| B. | Endodermal cells |
| C. | Cortical cells |
| D. | Xylem parenchyma |
| Answer» C. Cortical cells | |
| 2032. |
The movement of water is along |
| A. | Turgor gradien |
| B. | DPD gradient |
| C. | Diffusion gradient |
| D. | Osmotic gradient |
| Answer» C. Diffusion gradient | |
| 2033. |
Transpiration is unavoidable evil because of |
| A. | Structure of leaf and harmful effect |
| B. | Beneficial and harmful effect. |
| C. | Maintenance of turgidity for growth |
| D. | Gaseous exchange for photosynthesis and respiration |
| Answer» E. | |
| 2034. |
The most effective light for stomatal opening is_____________ |
| A. | Yellow |
| B. | Green |
| C. | Red |
| D. | Blue |
| Answer» E. | |
| 2035. |
Transpiration cohesion theory explains that the upwards pull of water is transmitted from top to bottom by cohesion of molecules caused by |
| A. | Hydrophilic cell wall |
| B. | Hydrogen bonds |
| C. | Oxygen bonds |
| D. | Surface tension |
| Answer» C. Oxygen bonds | |
| 2036. |
Swelling of wooden frames during rains is caused by |
| A. | Endo osmosi |
| B. | Imbibation |
| C. | Capillarity |
| D. | Osmosis |
| Answer» B. Imbibation | |
| 2037. |
Cobalt chloride is blue in dry state. In contact with moisture, it turns in to |
| A. | Yellow |
| B. | Pink |
| C. | Red |
| D. | Green |
| Answer» C. Red | |
| 2038. |
Which of the following figure A, B, C and D shows the initial stage of plasmolysis ? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 2039. |
Force for passive water absorption develops in |
| A. | Xylem |
| B. | Aerial parts |
| C. | Root |
| D. | Root hairs |
| Answer» C. Root | |
| 2040. |
Whatis A and B in this diagram ? |
| A. | A - Apoplast pathway, B - Symplast pathway |
| B. | A - Vacuolar pathway, B - Symplast pathway |
| C. | A - Symplast pathway, B- Vacuolar pathway |
| D. | A - Apoplast pathway, B - Vacuolar pathway |
| Answer» D. A - Apoplast pathway, B - Vacuolar pathway | |
| 2041. |
Match the following : |
| A. | (a-iii), (b-iv), (c-ii), (d-i) |
| B. | (a-iv), (b-ii), (c-i), (d-iii) |
| C. | (a-iii), (b-iv), (c-ii), (d-i) |
| D. | (a-i), (b-ii), (c-iii), (d-iv) |
| Answer» D. (a-i), (b-ii), (c-iii), (d-iv) | |
| 2042. |
The experimental setup in the given diagram is for ? (KCET 2003) |
| A. | Measuring the rate of transpiration |
| B. | The demostration of development of suction force due to transpiration |
| C. | The demonstration of anaerobic respiration |
| D. | The demonstration of ascent of sap. |
| Answer» C. The demonstration of anaerobic respiration | |
| 2043. |
What does A and B indicate in the diagram thistle funnel experment ? |
| A. | A - water, B - concentrated sugar solution |
| B. | A - water, B - sugar |
| C. | A - water, B - dilute sugar solution |
| D. | A - water, B - crystals of sugar |
| Answer» B. A - water, B - sugar | |
| 2044. |
Which process is observed in the diagram ? |
| A. | Imbibition |
| B. | Plasmolysis |
| C. | Osmosis |
| D. | Exosmosis |
| Answer» D. Exosmosis | |
| 2045. |
Which of the following figure shows the final stage of plasmolysis ? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 2046. |
What does A and B indicate in the diagram ? |
| A. | A - Epidemal Cell, B - Guard cell |
| B. | A - Guard cell, B - Epidermal cell |
| C. | A - Thickened wall, B - Epidermal cell |
| D. | A - Cytoplasmic membrane, B - Guard cell |
| Answer» D. A - Cytoplasmic membrane, B - Guard cell | |
| 2047. |
What is responsible for the opening and closing of ion-channel ? |
| A. | Electrical changes & Chemical Changes |
| B. | More Na+ Conc out side of plasma membrane |
| C. | More K+ Conc innerside of plasma membrane |
| D. | On both Side of membranes Na+ and K+ are in equal proportion |
| Answer» B. More Na+ Conc out side of plasma membrane | |
| 2048. |
What does “a” indicate in the given diagram |
| A. | Repolarization |
| B. | Depolarization |
| C. | Resting potential |
| D. | Activation of Na+ and K+ pump |
| Answer» C. Resting potential | |
| 2049. |
What does "a" and "b" indicate in the given diagram ? |
| A. | a = Synaptic bulb b = Phagocgtosis |
| B. | a = Presynaptic b = Phagocytosis |
| C. | a = Synaptic gap b = Secretion of neurotranmetter |
| D. | a = Presynaptic bulb b = Secretion neurotranmitter |
| Answer» E. | |
| 2050. |
Which option is correct for ion chhanel ? |
| A. | They are consist of lipid. |
| B. | They always remain open. |
| C. | They are Permeable to more than one ion |
| D. | They are consist of protein |
| Answer» E. | |