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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
Parthenocarpic tomato fruites can be produced byA. Raising the plants from vernalized seedsB. Treating the plants with phenylmercury acetateC. Removing androecium of flowers before pollen grains are releasedD. Treating the plants with low concentrations of gibberellic acid and auxins. |
| Answer» Correct Answer - D | |
| 402. |
Transport of cytokinin in the plant body isA. Basipetal B. Lateral C. Acropetal D. On all sides |
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Answer» Correct Answer - C Transport of cytokinin in the plant body is acropetal (upward). |
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| 403. |
Which wavelengths are the most effective in photoperiodism ?A. Green and yellowB. Blue and redC. Blue and violetD. Red and far red. |
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Answer» Correct Answer - D Red and far-red wavelengths are the most effective in photoperiodism |
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| 404. |
Which auxins are used in diluted form to produce parthenocarpic fruits?A. IAA and IBAB. 2, 4-D and IBAC. NAA and GAD. 2, 4-D and IAA |
| Answer» Correct Answer - A | |
| 405. |
Most of the plants are seasonal due toA. PhotoperiodismB. PhototropismC. PhotosynthesisD. Photolysis |
| Answer» Correct Answer - A | |
| 406. |
Which of the following is a gaseous hormone?A. EthyleneB. CytokininC. Both ethylene and auxinD. Gibberellin |
| Answer» Correct Answer - A | |
| 407. |
Cerain chmical substances having profound effect on growth ,are calledA. Cataytic agentsB. phytohormonesC. EnzymesD. Compost |
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Answer» Correct Answer - b |
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| 408. |
The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application ofA. IAA, IBAB. NAA, 2, 4-DC. Phenyl mercuric acidD. Cytokinins |
| Answer» Correct Answer - A | |
| 409. |
The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application ofA. 1AA, IBA B. NAA 2, 4-DC. Phenyl acetic acid D. Cytokinins |
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Answer» Correct Answer - B Pineapple can be made to produce fruits throughout the year by application of NAA or 2, 4-D (synthetic auxin) |
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| 410. |
Which type of plant can blossom throughout the year ?A. Long day plantB. Short long day pantsC. Short day plantD. Day neutral plant |
| Answer» Correct Answer - D | |
| 411. |
Who among the following discovered the A vena curvature test to find out the concentraton of auxinsA. F.W .WentB. L.J. AudusC. K.V ThimmanD. F.Skoog |
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Answer» Correct Answer - a |
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| 412. |
Why are vitamins not considered as plant growht hormones ? |
| Answer» Vitamins have no specific influence on growth of plants. They are essential dietary factors needed by an organism in small amounts. They influence on growth and metabolism through direct nutritive effects. | |
| 413. |
Why is it appropriate to call short-day plant a long-night plant ? |
| Answer» Short day plants need long and uninterrupted dark period for flowering. Therefore, it is appropriate to call a short-day plant a ong-night plant. | |
| 414. |
Foolish seeding disease is caused by a fungus. This study helped in discovery ofA. GibberellinB. CytokininC. ABAD. Auxin |
| Answer» Correct Answer - A | |
| 415. |
With respect to photoperiodism, these are long day plantA. Wheat, oat, soyabeanB. Wheat, Xanthium, paddyC. Wheat, poppy, soyabeanD. Wheat, poppy, beet |
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Answer» Correct Answer - d (d) Long-day plant will be induced to flower only period of available light exceeds a given critics limited period. Wheat, poppy, oat, beer etc.are longday plants |
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| 416. |
phytochrome becomes active inA. Red lightB. Green lightC. Blue lightD. None of these |
| Answer» Correct Answer - A | |
| 417. |
Physiologically active form of phytochrome isA. `P_(730)//P_("fr")`B. `P_(660)//P_(r)`C. `P_(700)`D. `P_(680)` |
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Answer» Correct Answer - A Physiologically active form of phytochrome is P730 |
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| 418. |
Phytochrome becomes active inA. Green lightB. Blur lightC. Red lightD. None of these |
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Answer» Correct Answer - c (c ) Phytochrome occurs in two i.e. Pr. (Red light ) and Pfr. (far red light) and both are intercovertible. It is considered that during dsy time Pfr form accumulates in plants which is inhibitory to flowering in SDP During nightn Pr form accumulates in plants which is stimulatory to flowering. |
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| 419. |
Which of the following hormone is reposible for senesnceA. GAB. ABAC. AuxinD. Cytokinin |
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Answer» Correct Answer - b (b) Abiscisis acis stimulates senescence of leaves by causing destruction of chlorophyll and inhibition of protien and RNA synthesis |
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| 420. |
One set of plants exposed to 12 hr day and 12 hr night llowered. The other set with similar exposure to daynight period but with dark period interrupted by Hash of light did not come to flower. The plant isA. Long dayB. Day neutralC. Indeterminate D. Short day. |
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Answer» Correct Answer - D One set of plants exposed to 12 hr day and 12 hr night flowered. The other set with similar exposure to day-night period but with dark period interrupted by flash of light did not come to flower. The plant is short day |
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| 421. |
Name the cells which have the capacity of self-prepetuation |
| Answer» Correct Answer - Meristematic cells | |
| 422. |
For germination of seed, which light is necessary Which wavelength of light is responsible for best floweringA. Red lightB. Green lightC. Far-red lightD. Blue light |
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Answer» Correct Answer - a (a) Red light of 660 nm stimulates germination in poditively photoblastic seeds |
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| 423. |
Give two examples of long day plants. |
| Answer» Radish, wheat, sugarbeet. (Any two) | |
| 424. |
Movement of auxin isA. Centripetal B. Basipetal C. Acropetal D. Both B and C |
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Answer» Correct Answer - B Movement of auxin is basipetal (downward). |
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| 425. |
Which of the following is a short day plantA. Wheat B. Barley C. Larkspur D. Dahlia |
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Answer» Correct Answer - D Dahlia is a short day plant |
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| 426. |
Which ones are long day plantsA. Wheat, Poppy, Soyabean B. Wheat, Poppy, Beet C. Wheat, Oat, SoyabeanD. Wheat,Xanthium, Paddy |
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Answer» Correct Answer - B Wheat, poppy and beet are long day plants. |
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| 427. |
Movement of auxin isA. centripetalB. basipetalC. acropetalD. Both (b) and ( c) |
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Answer» Correct Answer - D Went (1928) reported that auxin is transported basipetally, i.e., it moves from apical to basal end. However, McCrea.dy and Jacobs (1963) working on petiole segments of Phaseolus vulgaris observed acropetal movement of auxm but such type of movement occurs very little and directly dependent with the presence of oxygen Thus, recent studies have indicated that the polar movement of auxin is an active transport |
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| 428. |
What will be the effect on photochrome in a plant subjected to continous subjected to continous red lightA. Level of phytochrome decreasesB. Phytochrome is destroyedC. Phytochrome synthesis increasesD. Destruction and synthesis of phytochrome remain in equilibrium |
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Answer» Correct Answer - B Continuous exposure to red light causes (a) conversion of `P_r-P_(fr)` which is rapidly destroyed, (b) inhibition of synthesis of` P_1` Thus, total amount of phytochrome is decreased |
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| 429. |
If a tree flowers thrice in a year (October, January and july) in nothern india, it is said to beA. photosensitive but thermoinsensitiveB. thermosensitive but photoinsensitiveC. photo and thermosensitiveD. photo and thermoinsensitive |
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Answer» Correct Answer - D Since, flowering can take place during any part of the year, therefore, the plant is not sensitive to photoperiod and temperature |
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| 430. |
If a tree flowers thrice in a year (October, January and july) in nothern india, it is said to beA. Photosensitive but thermo-insensitiveB. Thermosensitive but photo-insensitiveC. Photo and thermo-insensitiveD. photo and thermosensitive |
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Answer» Correct Answer - b (b) Since flowering can take place during any part of the year therefore the plant is not sensitive to photoperiod. |
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| 431. |
Phyotron is a device by whiovhA. Electrons are bombardedB. Protons are liberatedC. Plants are grown in contrlled environmentD. Mutation are produced in plants |
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Answer» Correct Answer - c (c ) In glass houses when plants are kept on artificial light and temperature, then this method is called phytotron and is applicable in agriculture, horticulture and tissue culture. |
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| 432. |
Phyotron is a device by whiovhA. Induce mutation breeding in wheatB. Electron bombarding systemC. Plants are grown in controlled environmentD. Heavy water plants |
| Answer» Correct Answer - C | |
| 433. |
Phyotron is a device by whiovhA. Electron flow is measuredB. Mutations are induced in plantsC. The wind velocity is measuredD. Plants are grown in controlled environment |
| Answer» Correct Answer - B | |
| 434. |
If a tree flowers thrice in a year (October, January and july) in nothern india, it is said to beA. Photo! and thermo-sensitive B. Photoand thermo-insensitive C. Photosensitive but thermo-insensitive D. Thermosensitive but photo-insensitive |
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Answer» Correct Answer - B If a tree flowers thrice in a year in October, Januaray and Julty in northern india, the plant is photo- and thermo-insensitive. |
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| 435. |
Gibberellins induceA. Cell division B. Leaf senescence C. Hydrolysing enzymes in germinating seeds D. Flowering |
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Answer» Correct Answer - C Gibberellins induce hydrolysisn enzymes in germinating seeds. |
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| 436. |
Which of the following is formed after dedifferentiation?A. Secondary phloemB. Secondary cortexC. ParanchymaD. Interfascicular vascular cambium |
| Answer» Correct Answer - D | |
| 437. |
Give three examples of dedifferentiation in plants. |
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Answer» (i) Formation of interfascicular combinum in dicotyledonous stem from parenchymatous medullary rays. (ii) Formation of cork cambium from differentiated parenchymatous cells. (iii) Formation of callus by culturing the cells of pith during plant tissue culture. |
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| 438. |
The induction of flowering is used for ripening of fruits?A. VernalizationB. PhotoperiodismC. CryobiologyD. Chilozology |
| Answer» Correct Answer - A | |
| 439. |
Plant growth isA. LimitedB. UnlimitedC. DiffusedD. Both (1) and (2) |
| Answer» Correct Answer - B | |
| 440. |
How would you prevent leaf fall the fruity drop in plants ? Give reason. |
| Answer» We should apply auxin exogenously at the base of petiole of leaves and at the base of stalk of fruits to prevent leaf fall and fruit drop in plants as auxin prevents the formation of abscission zone. | |
| 441. |
Hormone produced during leaf fall isA. IAAB. ABAC. FlorigenD. Kinetin |
| Answer» Correct Answer - B | |
| 442. |
Which of the following is not caused by deficiency of mineral nutritionA. Chlorosis B. Internode shorteningC. Necrosis D. Etiolation |
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Answer» Correct Answer - D Etiolation is no caused by deficiency of mineral nutrition. |
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| 443. |
Leaf fall occurs when content of A. Abscisic acid decreases B. Auxin decreases C. Auxin increases D. Gibberellin decreases |
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Answer» Correct Answer - B Leaf fall occurs when content of auxin decreases. |
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| 444. |
Phyotron is a device by whiovhA. Electron are bombarbedB. Proton are liberatedC. Plants are grown in controlled environmentD. Mutations are produced in plants |
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Answer» Correct Answer - C Phytoron is a device by which plants are grown in controlled environment |
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| 445. |
Interfascicular cambium formation is induced byA. Auxin B. Cytokinin C. Gibberellin D. Ethylene |
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Answer» Correct Answer - B Interfasicular cambian formation is induced by cycotokinin. |
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| 446. |
Leaf of Mimosa droops down on touching because ofA. Water loss from leaflet basesB. changes in water concentrationC. Loss of water from cells to intercellular spaces in pulvinus and pulvinulesD. All of the above |
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Answer» Correct Answer - C Leaf of Mimosa droops down on touching because of loss of water from cells to intercellular in pulvinus and pulvinules. |
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| 447. |
Bulliform cells in Grass leaves showA. Grovyth movementB. Tropic movementsC. Turgor movementsD. |
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Answer» Correct Answer - D Bulliform cells in Grass leaves show turgor movements. |
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| 448. |
Miller, F.Skoog and hig co-workers are concered to discovery of |
| Answer» Correct Answer - Kinetin (Cytokinin) | |
| 449. |
Crescograph was prepared byA. BoseB. StrasburgerC. WentD. None of the above |
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Answer» Correct Answer - A (a) It is more delicate instrument and gives magnification upto 10,000 times. It uses as a root auxonometer. |
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| 450. |
Cold treament of seeds of called Or Seeds of winter varieties are benefited by this methodA. VernalizationB. StratificationC. DevernalizationD. Photophosphorylation |
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Answer» Correct Answer - A (a) The term vernalisation was coined byu Lysenko to the method of acceleration the flowering ability of biennials or winter annuals , by exposing their soaked to low temperature for a few weeks. |
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