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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.
| 9351. |
Dark reaction of photosynthesis is called |
| A. | Aphotic action |
| B. | Black action |
| C. | Blackman's reaction |
| D. | None of the above |
| Answer» D. None of the above | |
| 9352. |
Which of the following is a coconut milk factor [CBSE PMT 2000, 03; Manipal 2005] |
| A. | Auxin |
| B. | Cytokinin |
| C. | Morphactin |
| D. | None of the above |
| Answer» C. Morphactin | |
| 9353. |
Zeatin has been obtained from |
| A. | Wheat |
| B. | Rice |
| C. | Maize |
| D. | Oat |
| Answer» D. Oat | |
| 9354. |
Which of the following is capable of delaying yellowing of leaves [DPMT 1980] |
| A. | Gibberellins |
| B. | Cytokinins |
| C. | ABA |
| D. | Auxins |
| Answer» C. ABA | |
| 9355. |
Leaf fall can be prevented by [CBSE PMT 1989] |
| A. | Florigen |
| B. | Auxin |
| C. | Cytokinins |
| D. | Abscisic acid |
| Answer» D. Abscisic acid | |
| 9356. |
The word ?cytokinin? which induces cell division was given by [JIPMER 1985] |
| A. | Yabuta |
| B. | Brown |
| C. | Letham |
| D. | Fitting |
| Answer» D. Fitting | |
| 9357. |
Pruning of plants promotes branching because the axillary buds get sensitized to [AIIMS 2004] |
| A. | Ethylene |
| B. | Gibberellin |
| C. | Cytokinin |
| D. | Indole acetic acid |
| Answer» D. Indole acetic acid | |
| 9358. |
Which of the following causes delaying of senescence [CPMT 2000; AIIMS 2001; BHU 2004] |
| A. | Cytokinins |
| B. | Auxins |
| C. | Gibberellins |
| D. | Ascorbic acid |
| Answer» B. Auxins | |
| 9359. |
Senescence is inhibited by [Orissa JEE 2004] |
| A. | Ethylene |
| B. | Gibberellic acid |
| C. | Cytokinin |
| D. | Abscissic acid |
| Answer» D. Abscissic acid | |
| 9360. |
Which of the following induces flowering in short day plant [AFMC 1997] |
| A. | Gibberellins |
| B. | Cytokinin |
| C. | Auxins |
| D. | Ethylene |
| Answer» C. Auxins | |
| 9361. |
A plant hormone used for inducing morphogenesis in plant tissue culture is [CBSE PMT 1998] |
| A. | Abscisic acid |
| B. | Gibberellins |
| C. | Cytokinins |
| D. | Ethylene |
| Answer» D. Ethylene | |
| 9362. |
Cytokinesis refers to [KCET 1994] |
| A. | Division of chromosomes |
| B. | Division of cytoplasm |
| C. | Division of nucleus |
| D. | None of these |
| Answer» C. Division of nucleus | |
| 9363. |
Which of the following induces cell division in a cell [AFMC 1997] |
| A. | Cytokinin |
| B. | Gibberellins |
| C. | Auxins |
| D. | ABA |
| Answer» B. Gibberellins | |
| 9364. |
Which of the following exerts Richmond-Lang effect i.e. prevents loss of chlorophyll |
| A. | Kinetin/BA |
| B. | Auxin/AA |
| C. | Light |
| D. | Gibberellin/Prophyrin |
| Answer» B. Auxin/AA | |
| 9365. |
6-furfuryl adenine is |
| A. | An auxin |
| B. | A gibberellin |
| C. | A cytokinin |
| D. | A vitamin |
| Answer» D. A vitamin | |
| 9366. |
Which hormone is concerned chiefly with cell division in plants [BHU 1984; DPMT 1985; MP PMT 1989; CBSE PMT 1988; AFMC 2000] |
| A. | IAA |
| B. | Kinin |
| C. | \[G{{A}_{2}}\] |
| D. | 2, 4-D |
| Answer» C. \[G{{A}_{2}}\] | |
| 9367. |
Guttman (1957) found a quick increase in the amount of RNA in the nuclei on onion root after |
| A. | Auxin treatment |
| B. | Kinetin treatment |
| C. | Gibberellin treatment |
| D. | All the above |
| Answer» C. Gibberellin treatment | |
| 9368. |
Name ?zeatin? was given by [RPMT 1995; J &K CET 2002; BVP 2003] |
| A. | Skoog |
| B. | Miller |
| C. | Letham |
| D. | Melver |
| Answer» D. Melver | |
| 9369. |
Cytokinin firstly synthesized by [RPMT 1995; BVP 2003] |
| A. | Skoog and Miller |
| B. | Letham |
| C. | Bensan and Calvin |
| D. | Thimman and Went |
| Answer» C. Bensan and Calvin | |
| 9370. |
Which of the following is indispensable in all culture [DPMT 1985] |
| A. | Gibberellin |
| B. | Kinetin |
| C. | Ethylene |
| D. | Auxin |
| Answer» C. Ethylene | |
| 9371. |
Which of the following is a kinetin derivative |
| A. | Adenine |
| B. | Thymine |
| C. | Uracil |
| D. | Cytocyne |
| Answer» B. Thymine | |
| 9372. |
An excised leaf does not turn yellow if it is induced to root. This is attributed to synthesis in root of or Leaf aging is retarded by [DPMT 1984; CPMT 1985; CBSE PMT 1988] |
| A. | Ethylene |
| B. | Cytokinins |
| C. | Gibberellins |
| D. | Auxins |
| Answer» C. Gibberellins | |
| 9373. |
Zeatin is a |
| A. | Vitamin |
| B. | Growth inhibitor |
| C. | Growth promotor |
| D. | None of the above |
| Answer» D. None of the above | |
| 9374. |
Cytokinin is a hormone whose main function is [DPMT 1983; MP PMT 1980] |
| A. | Induction of cell division and delay in senescence |
| B. | To take part in cell division |
| C. | Refers to cell movements |
| D. | To cause dormancy |
| Answer» B. To take part in cell division | |
| 9375. |
Cycas leaflets are [MHCET 2004] |
| A. | Sessile, straight, oval |
| B. | Sessile, straight, linear-lanceolate |
| C. | Sessile, straight, spiny |
| D. | Sessile, smooth, twisted |
| Answer» C. Sessile, straight, spiny | |
| 9376. |
Megasporophylls are found in [MHCET 2000] |
| A. | Male Cycas |
| B. | Female Cycas |
| C. | Male Pinus |
| D. | Female Pinus |
| Answer» C. Male Pinus | |
| 9377. |
Sterile part of Cycas microsporophyll is [MHCET 2004] |
| A. | Apophysis |
| B. | Sporophore |
| C. | Middle part |
| D. | Lower part |
| Answer» B. Sporophore | |
| 9378. |
Coralloid roots is the feature of [BHU 2005] |
| A. | Cycas |
| B. | Mosses |
| C. | Pinus |
| D. | Selaginella |
| Answer» B. Mosses | |
| 9379. |
In Cycas Pollination takes place in [BHU 2005] |
| A. | 3-celled stage |
| B. | 4-celled stage |
| C. | 2-celled stage |
| D. | 1-celled stage |
| Answer» B. 4-celled stage | |
| 9380. |
Algal zone is characteristic of [CPMT 1994] |
| A. | Normal root of Cycas |
| B. | Root of Pinus |
| C. | Coralloid roots of Cycas |
| D. | Stem of Cycas |
| Answer» D. Stem of Cycas | |
| 9381. |
Early embryogeny in Cycas is characterized by [CPMT 1991] |
| A. | Absence of suspensor cell |
| B. | Presence of expanded free nuclear division |
| C. | Reduced free nuclear division |
| D. | Many cotyledons |
| Answer» C. Reduced free nuclear division | |
| 9382. |
Cycas has two cotyledons but is not included under angiosperms because it has [CBSE PMT 2001] |
| A. | Circinate ptyxis |
| B. | Compound leaves |
| C. | Monocot like stem |
| D. | Naked seeds |
| Answer» E. | |
| 9383. |
The stem of female Cycas plant is a [MHCET 2002] |
| A. | Monopodium |
| B. | Sympodium |
| C. | Rhizomatous |
| D. | Dichotomous |
| Answer» B. Sympodium | |
| 9384. |
Cycas is living fossil as it has [BHU 1992] |
| A. | Ciliated sperms |
| B. | Structure like that of Tree Fern |
| C. | Restricted occurrence in certain areas |
| D. | Been found in fossil state also |
| Answer» D. Been found in fossil state also | |
| 9385. |
Negatively geotropic roots are found in [Orissa 2005] |
| A. | Colocasia |
| B. | Cycas |
| C. | Cactus |
| D. | Coleus |
| Answer» C. Cactus | |
| 9386. |
Male and female Cycas plants show which type of growth |
| A. | Monopodial in both |
| B. | Sympodial in both |
| C. | Monopodial in male and sympodial in female plant |
| D. | Sympodial in male and monopodial in female plant |
| Answer» E. | |
| 9387. |
Which species of Cycas is having largest male cones |
| A. | Cycas revoluta |
| B. | C. rumphii |
| C. | C. circinalis |
| D. | C. beddomei |
| Answer» D. C. beddomei | |
| 9388. |
Polyembryony seen in Cycas is |
| A. | Potential true polyembryony |
| B. | Potential true polyembryony and cleavage polyembryony |
| C. | Adventive polyembryony |
| D. | All of these |
| Answer» B. Potential true polyembryony and cleavage polyembryony | |
| 9389. |
Secondary wood of Cycas is devoid of |
| A. | Tracheids |
| B. | Vessels |
| C. | Protoxylem |
| D. | Metaxylem |
| Answer» C. Protoxylem | |
| 9390. |
Number of ovules present on megasporophyll of Cycas is |
| A. | Only one |
| B. | One pair |
| C. | 1 ? 6 pairs |
| D. | Absent |
| Answer» D. Absent | |
| 9391. |
Cycas circinalis is a source of [BVP 2004; CPMT 2005] |
| A. | Resin |
| B. | Timber |
| C. | Essential oil |
| D. | Starch (Sago) |
| Answer» E. | |
| 9392. |
Vascular bundles of Cycas stem are |
| A. | Conjoint |
| B. | Collateral and closed |
| C. | Conjoint, collateral and open |
| D. | Conjoint, collateral and closed |
| Answer» D. Conjoint, collateral and closed | |
| 9393. |
Cycas plant is like ............. in appearance |
| A. | Mango |
| B. | Acacia |
| C. | Date palm |
| D. | Ficus |
| Answer» D. Ficus | |
| 9394. |
The number of cotyledons in seed of Cycas is [CPMT 1990] |
| A. | 1 |
| B. | 2 |
| C. | Many |
| D. | All of these |
| Answer» C. Many | |
| 9395. |
The number of neck canal cells in archegonium of Cycas is |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 0 |
| Answer» E. | |
| 9396. |
Germination of Cycas seed is |
| A. | Epigeal |
| B. | Hypogeal |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» C. Both (a) and (b) | |
| 9397. |
How many archegonia develop on one gametophyte of Cycas |
| A. | 1 |
| B. | 2 |
| C. | \[15\] |
| D. | \[36\] |
| Answer» E. | |
| 9398. |
Cycas ovule is |
| A. | Orthotropous and unitegmic |
| B. | Orthotropous and bitegmic |
| C. | Anatropous and unitegmic |
| D. | None of these |
| Answer» B. Orthotropous and bitegmic | |
| 9399. |
The number of prothallial cells in male gametophyte of Cycas is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» B. 2 | |
| 9400. |
Transfusion tissue is found in |
| A. | Cycas leaf |
| B. | Cycas leaflet |
| C. | Cycas petiole |
| D. | Cycas root |
| Answer» C. Cycas petiole | |