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.
| 1901. |
RAAS secretes which of the following hormones? |
| A. | Mineralocorticoids |
| B. | glucoticoids |
| C. | Both A and B |
| D. | None of these |
| Answer» B. glucoticoids | |
| 1902. |
Lungs expel (MH 2005) |
| A. | CO2 |
| B. | H2O |
| C. | CO2 and water |
| D. | CO2 and water vapours |
| Answer» E. | |
| 1903. |
which of these is not a keton body (CPMT 04) |
| A. | Asetoacetic acid |
| B. | Acetone |
| C. | Succinic acid |
| D. | Betabychoxy butyric acid |
| Answer» D. Betabychoxy butyric acid | |
| 1904. |
The kidney of adult mammals are (MP PMT 99) |
| A. | Opisthonephron |
| B. | pronephros |
| C. | Mesonephros |
| D. | rletanaphros |
| Answer» E. | |
| 1905. |
Excertory organs of cockroach are (Kerala PMT 07) |
| A. | Malpighian corpucles |
| B. | Malpighian tubules |
| C. | Hepetic caecae |
| D. | Green glands |
| Answer» C. Hepetic caecae | |
| 1906. |
Kidney stone are (Kerala PMT 2003) |
| A. | Crystals of sillica |
| B. | crystals of Nacl |
| C. | Cystals of Oxalate |
| D. | Crystals of Nahco3 |
| Answer» D. Crystals of Nahco3 | |
| 1907. |
Which blood vessel carries least ammount of urea? (HAR PMT 2005) |
| A. | Pulmonary vein |
| B. | Renal artery |
| C. | Renal vein |
| D. | Hepatic portal vein |
| Answer» D. Hepatic portal vein | |
| 1908. |
Maximum reabsorption of useful substance occurs in the region of nephron: |
| A. | Henle’s loop |
| B. | Glomeruls |
| C. | PCT |
| D. | DCT |
| Answer» D. DCT | |
| 1909. |
Part of nephron involved in active reabsorption of sodium is (JIPMER 2002) |
| A. | PCT |
| B. | Ascending limb of Henle’s loop |
| C. | Bowman’s capsule |
| D. | DCT |
| Answer» C. Bowman’s capsule | |
| 1910. |
Juxta glomerular cells of renal cortex synthesize a hormone called: (BHV 2007) |
| A. | ADH |
| B. | Oxytocin |
| C. | Renin |
| D. | Urochrom |
| Answer» D. Urochrom | |
| 1911. |
Which of the following is both osmoregulator as well as nitrogenours product (DPMT 07) |
| A. | NH3 |
| B. | Urea |
| C. | Uric acid |
| D. | All of these |
| Answer» C. Uric acid | |
| 1912. |
Transpiration is least in (CBSE 1998, BHU, 1987, KCET 2006) |
| A. | Good soil moisture |
| B. | Hight wind velocity |
| C. | Dry environment |
| D. | High atmospheric humidity |
| Answer» D. High atmospheric humidity | |
| 1913. |
A kidney stone is (CPMT 88, Manipal 05)(Kerala 2003) |
| A. | Blockage by fats |
| B. | Desposition of sand in kidney |
| C. | A salt such as Oxalate crystallised in pelvis |
| D. | Blockage by proteins |
| Answer» D. Blockage by proteins | |
| 1914. |
The glomenuli are continued to the (CPMT 88) |
| A. | Medulla |
| B. | Calyces |
| C. | Cortex |
| D. | REnal Pelvis |
| Answer» D. REnal Pelvis | |
| 1915. |
Guttation is the process of elimination of water from plants through (BHU 1986, JIPMER 1987, MPPMT 1995, Orissa 2003) |
| A. | Stomata |
| B. | Hydathodes |
| C. | Lenticels |
| D. | Wounds |
| Answer» E. | |
| 1916. |
Purple cabbage leaves do not pass out colour in cold water but do so in hot water becasue (AFMC 1988) |
| A. | Hot water enters the cell faster |
| B. | Pigment is not soluble in cold water |
| C. | Hot water destroys cell walls |
| D. | Hot water kills plasmalemma and makes it permeable |
| Answer» B. Pigment is not soluble in cold water | |
| 1917. |
Which one option does not involve osmosis ? (MPPMT 1991) |
| A. | Water passing from one xylem element to the other above it. |
| B. | Water passing from soil to root hair |
| C. | Water passing into mesophyll cell from xylem |
| D. | Water passing from root hair cell to cortical cell |
| Answer» C. Water passing into mesophyll cell from xylem | |
| 1918. |
In a hypertonic solution a cell’s water potential |
| A. | Decrease |
| B. | Increases |
| C. | First increases then decreases |
| D. | No change |
| Answer» B. Increases | |
| 1919. |
A cell increase in volume if the external medium is (Har. PMT 2005) |
| A. | Hypotonic |
| B. | Hypertonic |
| C. | Isotonic |
| D. | None of the above |
| Answer» B. Hypertonic | |
| 1920. |
A bottle filled with previously moistened mustard seeds and water was screw capped tightly andkept in a corner. It blew up suddenly after about half an hour. The phenomenon involved is |
| A. | Diffusion |
| B. | Imbibition |
| C. | Osmosis |
| D. | DPD (CBSE 1990) |
| Answer» C. Osmosis | |
| 1921. |
A cell placed in strong salt solution will shrink because (JIPMER 1986) |
| A. | Cytoplasm will decompose |
| B. | Mineral salts will break the cell wall |
| C. | Salt water enters the cell |
| D. | Water comes out by exoosmosis |
| Answer» B. Mineral salts will break the cell wall | |
| 1922. |
Water potential is equal to (CBSE 1988, AMV 1997) |
| A. | Ψ S + OP |
| B. | Ψ S = TP |
| C. | Ψ P + Ψ W |
| D. | Ψ P + Ψ W |
| Answer» E. | |
| 1923. |
Maximum transpiration takes place from |
| A. | Stem |
| B. | Leaves |
| C. | Roots |
| D. | Flowers and fruits |
| Answer» C. Roots | |
| 1924. |
Raisins placed in water swell up due to (CPMT 1988, KCET 2008) |
| A. | Plasmolysi |
| B. | Adsorption |
| C. | Diffusio |
| D. | Endo osmosis |
| Answer» D. Endo osmosis | |
| 1925. |
An example of selectively permeable membrane is (CPMT 1988) |
| A. | Plasmalemma |
| B. | Cell wall |
| C. | Mitochondrial membrane |
| D. | Chloroplast membrane |
| Answer» C. Mitochondrial membrane | |
| 1926. |
If a cell gets reduced in size when placed in solution, the solution is (CPMT 1988, AFMC 2009) |
| A. | Hypertonic |
| B. | Hypotonic |
| C. | Weak |
| D. | Saturated |
| Answer» B. Hypotonic | |
| 1927. |
Osmosis defined as |
| A. | Flow of solvent (water) through a semipermiable membrane from less concentrated solution to more concentrated solution. |
| B. | Flow of solute from a semipermeable membrane |
| C. | Flow of water without a membrane |
| D. | None ot the above |
| Answer» B. Flow of solute from a semipermeable membrane | |
| 1928. |
Guard cells differ from epidermal cells in having. (CPMT 1993, CBSE 2011) |
| A. | Mitochondria |
| B. | Vacuoles |
| C. | Cell wall |
| D. | Chloroplast |
| Answer» C. Cell wall | |
| 1929. |
Stomata open during day time because the guard cells (CPMT 1987) |
| A. | Produce osmotically active sugars or organic acids |
| B. | Are thin walled |
| C. | Are bean shaped |
| D. | Have to help in gaseous exchange |
| Answer» E. | |
| 1930. |
What is the action spectrum of transpiration ? (RPMT 1995, CET Chd. 2006) |
| A. | Green and ultraviolet |
| B. | Orange and red |
| C. | Blue and far red |
| D. | Blue and red |
| Answer» B. Orange and red | |
| 1931. |
When concentration of solutes is low in the soil, absorption of water is (CMPT 1987, KCET 2007) |
| A. | Stopped |
| B. | Increased |
| C. | Retarded |
| D. | Normal |
| Answer» E. | |
| 1932. |
A cell is plasmolysed after being kept in hypertonic solution. What will be present between cell wall and plasmalemma ? |
| A. | Isotonic solution |
| B. | Hypertonic solution |
| C. | Air |
| D. | Hypotonic solution |
| Answer» E. | |
| 1933. |
Wilting in plants occurs when (CPMT 1987, 1991, 2002, AFMC 2005, BHU 2006, WB 2008) |
| A. | Phloem is blocked |
| B. | Xylem is removed / blocked |
| C. | Pith is removed |
| D. | A few leaves are removed |
| Answer» C. Pith is removed | |
| 1934. |
When beet root cylinders are washed and then placed in cold water, anthocyanin does not comeout. This indicates that most likely the plasma membrane is (AFMC 1990) |
| A. | Permeable to enthocyanin |
| B. | Impermeable to anthocyanin |
| C. | Differentially permeable to anthocyanin |
| D. | Dead structure |
| Answer» E. | |
| 1935. |
Dry seeds when placed in waeter swell up due to |
| A. | Imbibition |
| B. | Absorption |
| C. | Diffusion |
| D. | Adsorption |
| Answer» C. Diffusion | |
| 1936. |
It is produced during water stress that brings stomatal closure. (AMU 1992, CBSE 1993, 1994, 2001, RPMT 2000, JIPMER 2000, Orissa 2009, MP PMt 1992) |
| A. | Ethylene |
| B. | Abscisic acid |
| C. | Ferulic acid |
| D. | Coumarin |
| Answer» E. | |
| 1937. |
Stomatal opening is under the control of (KCET 1988, Manipur 2005) |
| A. | Epidemal cell |
| B. | Pallisde cells |
| C. | Spongy cells |
| D. | Guard cells |
| Answer» C. Spongy cells | |
| 1938. |
Root hairs absorb water from soil when (AFMC 1988, JIPMER 1986) |
| A. | Osmotic concentration is same in the two |
| B. | Solute concentration is higher in soil solution |
| C. | Solute concentration is higher in root hairs |
| D. | Absorption is active |
| Answer» E. | |
| 1939. |
Plant cell kept in hypertonic solution will get (MPPMT 1994) |
| A. | Lysed |
| B. | Turgid |
| C. | Deplasmolysed |
| D. | Plasmoysed |
| Answer» C. Deplasmolysed | |
| 1940. |
A higher plant cell covered with cutin and suberin is placed in water, after 15 minutes, the cell (BHU 1993) |
| A. | Will be killed |
| B. | Size will increase |
| C. | Size will remain unchanged |
| D. | Size will decrease |
| Answer» E. | |
| 1941. |
Water will be absorbed by root hairs when the externael medium is (JIPMER 1986, AFMC 1993) |
| A. | Hypotonic |
| B. | Hypertonic |
| C. | Isotonic |
| D. | Viscous |
| Answer» D. Viscous | |
| 1942. |
Water in plants is transported by or ascent of sap takes place through (BHU 1991, DPMT 1987, CPMT 1983, 1996, MHTCET 2009) |
| A. | Cambium |
| B. | Phloem |
| C. | Xylem |
| D. | Epidermis |
| Answer» B. Phloem | |
| 1943. |
Water rises in the stem due to (RPMT 2000) |
| A. | Cohesion and transpiration pull |
| B. | Turgor pressure |
| C. | Osmotic pressure |
| D. | Root pressure (negative) |
| Answer» D. Root pressure (negative) | |
| 1944. |
In guard cells when sugar is converted into starch, the stomatal pore (CBSE 1997) |
| A. | Closed completely |
| B. | Opens partiall |
| C. | Opens fully |
| D. | Remains unchanged |
| Answer» B. Opens partiall | |
| 1945. |
Root pressur is due to (MPPMT 1993, Har. PMT 2003, Orissa 2011) |
| A. | Active absorption |
| B. | Passive absorption |
| C. | Increased transpiration |
| D. | Increased photosynthesis |
| Answer» E. | |
| 1946. |
Path of water movement from soil to xylem is (CPMT 1989, Kerala 2008) |
| A. | Meta xylem - protoxylem - cortex - soil - roothair |
| B. | Cortex - root hair - endodermis - pericycle - protoxylem - meta xylem |
| C. | Soil - root hair - cortex - endodermis - pericycle - protoxylem - meta xylem |
| D. | Pericycle - soil - root hair - cortex endodermis - protoxylem metaxylem |
| Answer» D. Pericycle - soil - root hair - cortex endodermis - protoxylem metaxylem | |
| 1947. |
Rate of transpiration is reduced with (CPMT 1987, MPPMT 1999) |
| A. | Rise in temperature |
| B. | Decrease in light intensity |
| C. | Increase in wind velocity |
| D. | Increase in water uptake |
| Answer» C. Increase in wind velocity | |
| 1948. |
Root hairs occur in the zone of (Kerala 2003) |
| A. | Cell division |
| B. | Cell elongation |
| C. | Cell maturatio |
| D. | Mature cells |
| Answer» D. Mature cells | |
| 1949. |
Wilting appears due to excessive. (MP PMT 1989, RPMT 2000, AFMC 2001, Pb. PMT 2001) |
| A. | Respiration |
| B. | Photosynthesis |
| C. | Absorption |
| D. | Transpiration |
| Answer» B. Photosynthesis | |
| 1950. |
In terrestrial habitats, temperature and railfall conditions are influenced by (CBSE 1989) |
| A. | Water transformation |
| B. | Transpiration |
| C. | Thermoperiodism |
| D. | Translocation |
| Answer» B. Transpiration | |