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.
| 4251. |
The scientist who coined the term 'protista' to include both plant and animal like unicellular organism was [BHU 1982] |
| A. | Robert Koch |
| B. | E.F. Haeckel |
| C. | L. Pasteur |
| D. | Joseph Lister |
| Answer» C. L. Pasteur | |
| 4252. |
Effect of length of day (light duration) on flowering is called [BHU 1979; CPMT 1984; CPMT 1991; JIPMER 2001] |
| A. | Phototropism |
| B. | Photoperiodism |
| C. | Photorespiration |
| D. | None of the above |
| Answer» C. Photorespiration | |
| 4253. |
The low temperature treatment that reduces the period between sowing and flowering is called [AMU 2005; HP PMT 2005] |
| A. | Chemostaxis |
| B. | Vernilization |
| C. | Freezing injury |
| D. | None of the above |
| Answer» C. Freezing injury | |
| 4254. |
Which of the following is a short day plant [HP PMT 2005] |
| A. | Wheat |
| B. | Barley |
| C. | Larkspur |
| D. | Dahlia |
| Answer» E. | |
| 4255. |
The movement of organs in response to light is called [J&K CET 2005] |
| A. | Hydrotropism |
| B. | Thigmotropism |
| C. | Phototropism |
| D. | Geotropism |
| Answer» D. Geotropism | |
| 4256. |
The period of suspended growth due to exogenous condition is termed as [J&K CET 2005] |
| A. | Quiescence |
| B. | Dormancy |
| C. | Perennation |
| D. | Hibernation |
| Answer» C. Perennation | |
| 4257. |
Photoperiodism is substituted by [MP PMT 2005] |
| A. | Temperature |
| B. | Mineral nutrient |
| C. | Vit |
| D. | Iron |
| Answer» B. Mineral nutrient | |
| 4258. |
Short day plant is [Orissa JEE 2005] |
| A. | Xanthium |
| B. | Pisum |
| C. | Cucumis |
| D. | Avena |
| Answer» B. Pisum | |
| 4259. |
If plants are given only visible light it's growth will [MP PMT 2005] |
| A. | Increase |
| B. | Decrease |
| C. | Unusual form |
| D. | None of these |
| Answer» C. Unusual form | |
| 4260. |
Phytochrome occurs in two forms. In which form it promotes the germination of seeds of some species [CPMT 2004] |
| A. | forms |
| B. | forms |
| C. | Both forms |
| D. | None of these |
| Answer» B. forms | |
| 4261. |
When flowering is regulated by length of day and night, it is called [Orissa JEE 2004] |
| A. | Photoperiodism |
| B. | Phototropism |
| C. | Nyctinasty |
| D. | None of these |
| Answer» B. Phototropism | |
| 4262. |
Phytochrome is found in [BHU 1985, 87] |
| A. | Algae |
| B. | Fungi |
| C. | Vascular cryptogams |
| D. | Flowering plants |
| Answer» E. | |
| 4263. |
The maximum growth rate occurs in [CBSE PMT 2004] |
| A. | Lag phase |
| B. | Exponential phase |
| C. | Stationary phase |
| D. | Senescent phase |
| Answer» C. Stationary phase | |
| 4264. |
In SDP flowering does not occur [BHU 2003] |
| A. | When intermediate light is given redfar red red |
| B. | Interrupted by a flash of far light |
| C. | Interrupted by a flash redfar light |
| D. | All of these |
| Answer» B. Interrupted by a flash of far light | |
| 4265. |
Vernalisation is done at [BHU 1999; CPMT 2000; DPMT 2003, 04; BVP 2004] |
| A. | Lower temperature |
| B. | Low light intensity |
| C. | Higher temperature |
| D. | High light intensity |
| Answer» B. Low light intensity | |
| 4266. |
A pigment concerned with both floral induction and seed germination is [MP PMT 2002] |
| A. | Florigen |
| B. | Chlorophyll |
| C. | Plastocyanin |
| D. | Phytochrome |
| Answer» E. | |
| 4267. |
Photoperiodism affects [MP PMT 2001] |
| A. | Vegetative growth |
| B. | Internode elongation |
| C. | Seed germination |
| D. | All of these |
| Answer» E. | |
| 4268. |
Which of the following is a long day plant [CBSE PMT 2001] |
| A. | Mirabilis |
| B. | Glycine max |
| C. | Mirabilis jalapa |
| D. | Spinacia oleracea |
| Answer» E. | |
| 4269. |
Proteinaceous pigment which is the centre of activities concerned with light is [CBSE PMT 2001] |
| A. | Phytochrome |
| B. | Chlorophyll |
| C. | Anthocyanin |
| D. | Carotenoids |
| Answer» B. Chlorophyll | |
| 4270. |
The pigment involved in photomorphogenetic movements is [BHU 2000] |
| A. | Phytochrome |
| B. | Cytochrome |
| C. | Chlorophyll |
| D. | Xanthophyll |
| Answer» B. Cytochrome | |
| 4271. |
Photoperiodism is associated with the formation of |
| A. | Chlorophyll |
| B. | Florigen |
| C. | Auxin |
| D. | Gibberellin |
| Answer» C. Auxin | |
| 4272. |
Phytochrome becomes active in [CBSE PMT 1998] |
| A. | Green light |
| B. | Blue light |
| C. | Red light |
| D. | None of these |
| Answer» D. None of these | |
| 4273. |
The effect of daily light period on flowering is called [CPMT 1999] |
| A. | Photoperiodism |
| B. | Photo-oxidation |
| C. | Phototropism |
| D. | Photorespiration |
| Answer» B. Photo-oxidation | |
| 4274. |
The phytochrome was discovered by [MP PMT 1998, 2002] |
| A. | Garner and Allard |
| B. | W. Went |
| C. | F.F. Blackman |
| D. | F.E. Fritsch |
| Answer» B. W. Went | |
| 4275. |
Most of the plants are seasonal due to [MP PMT 1997] |
| A. | Photoperiodism |
| B. | Phototropism |
| C. | Photosynthesis |
| D. | Photolysis |
| Answer» B. Phototropism | |
| 4276. |
Phytochrome plays important role in |
| A. | Photosynthesis |
| B. | Respiration |
| C. | Photorespiration |
| D. | Photomorphogenesis |
| Answer» E. | |
| 4277. |
What will happen if several bulbs are lighted in soyabean fields in the night |
| A. | Production will be more |
| B. | Production will be normal |
| C. | Production will be less |
| D. | No effect |
| Answer» D. No effect | |
| 4278. |
For germination of seed, which light is necessary [AFMC 1996] |
| A. | Red light |
| B. | Green light |
| C. | Far-red light |
| D. | Blue light |
| Answer» B. Green light | |
| 4279. |
Which of the following pigment is present in two forms [CPMT 1995] |
| A. | Cytochrome |
| B. | Florigen |
| C. | Phytochrome |
| D. | Vernalin |
| Answer» D. Vernalin | |
| 4280. |
Photoperiodism is |
| A. | Growth curvature in response to light |
| B. | Reccurrence of day and night |
| C. | Effect of day length and plant growth |
| D. | Flowering plant |
| Answer» D. Flowering plant | |
| 4281. |
Which of the following process is never affected by light in a vegetable garden [AFMC 1982, 85] |
| A. | Seed germination |
| B. | Flowering |
| C. | Osmosis and fertilization |
| D. | Food manufacture |
| Answer» D. Food manufacture | |
| 4282. |
If a tree flowers thrice in a year (October, January and July) in Northern India, it is said to be [CBSE PMT 1997] |
| A. | Photosensitive but thermo-insensitive |
| B. | Thermosensitive but photo-insensitive |
| C. | Photo and thermo-insensitive |
| D. | Photo and thermosenitive |
| Answer» C. Photo and thermo-insensitive | |
| 4283. |
What is the effect on the flowering of a plant if a flash of red light is followed by a flash of far-red light [AIIMS 1985] |
| A. | Flowering is increased |
| B. | Flowering is decreased |
| C. | Flowering is stopped |
| D. | Effect of red flash is reversed |
| Answer» E. | |
| 4284. |
What is the action spectrum of photoperiodism [BHU 1982] |
| A. | 430 and 660 nm |
| B. | 640 and 660 nm |
| C. | 660 and 730 nm |
| D. | 700 and 900 nm |
| Answer» D. 700 and 900 nm | |
| 4285. |
The flowering response of plant can be changed by |
| A. | Inducing mutations |
| B. | Photoperiodic treatment |
| C. | Injecting enzymes |
| D. | Somatic hybridization |
| Answer» C. Injecting enzymes | |
| 4286. |
Which of the following exerts profound effect on the reproductive growth of a flowering plant [Wardha 1985; EAMCET 1985] |
| A. | Quality (colour) of light |
| B. | Quantity (intensity) of light |
| C. | Direction of light |
| D. | Duration of light cycle |
| Answer» E. | |
| 4287. |
A change from vegetative to reproductive phase in plant occurs in response to |
| A. | Food available in plants |
| B. | Change in temperature |
| C. | Change in duration of light |
| D. | Change in concentration of |
| Answer» D. Change in concentration of | |
| 4288. |
Physiologically active form of phytochrome is |
| A. | P 660 |
| B. | P 730 |
| C. | P 860 |
| D. | Mixture of all |
| Answer» C. P 860 | |
| 4289. |
The red-far red response is mediated by |
| A. | IAA |
| B. | GA |
| C. | CK |
| D. | ABA |
| Answer» C. CK | |
| 4290. |
The pigment involved in red-far red light interconversion is [MP PMT 1990; AIIMS 1987; CPMT 1994; CBSE PMT 1995, 2002] |
| A. | Cytochrome |
| B. | Xanthophyll |
| C. | Lycopen |
| D. | Phytochrome |
| Answer» E. | |
| 4291. |
A pigment responsible for light sensitivity in plants is |
| A. | Chlorophyll |
| B. | Carotene and xanthophyll |
| C. | Cytochrome |
| D. | Phytochrome |
| Answer» E. | |
| 4292. |
A green plant turns pale when transferred to prolonged darkness. It represents a phenomenon called [AFMC 1986] |
| A. | Etiolation |
| B. | Chlorosis |
| C. | Cytorrhisis |
| D. | Paleolation |
| Answer» C. Cytorrhisis | |
| 4293. |
A dark grown pale and undifferentiated seedling is called |
| A. | Morbid |
| B. | Etiolated |
| C. | Pallolated |
| D. | Chlorotic/Variegated |
| Answer» C. Pallolated | |
| 4294. |
Two seeds are germinated, A in light and B in dark. Which of the two grows much taller in initial stage |
| A. | A > B |
| B. | B A |
| C. | A = B |
| D. | No growth occurs in any of them |
| Answer» C. A = B | |
| 4295. |
Which of the following factors affect growth to a great extent |
| A. | Duration of light |
| B. | Direction of light |
| C. | Intensity of light |
| D. | Wavelength of light |
| Answer» D. Wavelength of light | |
| 4296. |
Florigen is synthesized in [RPMT 1995] |
| A. | Stem |
| B. | Leaves |
| C. | Root |
| D. | Fruits |
| Answer» C. Root | |
| 4297. |
In blue-violet colour light |
| A. | Internodal growth is pronounced |
| B. | Increase size of lamina of leaf |
| C. | Both [a] and [b] |
| D. | Reduces the expansion of leaves |
| Answer» D. Reduces the expansion of leaves | |
| 4298. |
Phytochrome is [MP PMT 1993] |
| A. | Absorption of blue light by leaves |
| B. | Absorption of PR and PFR in reversible manner |
| C. | Absorption of red light with wavelength 660mm |
| D. | Absorption of far-red light with wavelength 740mm |
| Answer» C. Absorption of red light with wavelength 660mm | |
| 4299. |
The practice of subjecting seeds to low temperatures for a period of time in order to cause growth and flowering during summer season is called [CPMT 1983; BHU 1985; MP PMT 1990; CBSE PMT 1992] |
| A. | Wintering |
| B. | Vernalization |
| C. | Devernalization |
| D. | Thermolysis |
| Answer» C. Devernalization | |
| 4300. |
If the seedlings are grown in darkness [NCERT 1980] |
| A. | They are of the same size as those grown in light |
| B. | They are much healthier than those grown in light |
| C. | They are similar to those grown in light |
| D. | They are taller than those grown in light |
| Answer» E. | |