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.
| 5451. |
Important contribution of molybdenum is [MP PMT 1992; JIPMER 2002; CBSE PMT 2003] |
| A. | Flower growth |
| B. | Nitrogen fixation |
| C. | Chromosome condensation |
| D. | Carbon fixation |
| Answer» C. Chromosome condensation | |
| 5452. |
Heart rot of marigold is caused by the deficiency of |
| A. | Chlorine |
| B. | Copper |
| C. | Boron |
| D. | Zinc |
| Answer» D. Zinc | |
| 5453. |
Iron is mainly absorbed in the |
| A. | Ferrous form |
| B. | Ferric form |
| C. | Both [a] and [b] |
| D. | None of these |
| Answer» B. Ferric form | |
| 5454. |
Deficiency of iron causes [BHU 1987; MP PMT 1995] |
| A. | Bending of leaf tip |
| B. | Interveinal chlorosis first on young leaves |
| C. | Decrease of protein synthesis |
| D. | Reduced leaves and stunted growth |
| Answer» C. Decrease of protein synthesis | |
| 5455. |
Which of the following element is a component of ferredoxin [CPMT 1989] |
| A. | Cu |
| B. | Mn |
| C. | Zn |
| D. | Fe |
| Answer» E. | |
| 5456. |
Which of the following is the importance of molybdenum in plants metabolism [Pb. PMT 1999] |
| A. | Carbon assimilation |
| B. | Nitrate reduction |
| C. | Plant breeding |
| D. | Chromosome contraction |
| Answer» C. Plant breeding | |
| 5457. |
One of the causes of littles leaf disease is due to deficiency of |
| A. | Copper |
| B. | Sodium |
| C. | Molybdenum |
| D. | Zinc |
| Answer» E. | |
| 5458. |
Deficiency of molybdenum cause [CPMT 1986] |
| A. | Poor development of vasculature |
| B. | Bending of leaf tip |
| C. | Yellowing of leaves |
| D. | Mottling and necrosis of leaves |
| Answer» E. | |
| 5459. |
Which one of the following is a micro-element |
| A. | Copper |
| B. | Calcium |
| C. | Magnesium |
| D. | Oxygen |
| Answer» B. Calcium | |
| 5460. |
Browning of cauliflower takes place due to deficiency of which one of the following elements |
| A. | Copper |
| B. | Molybdenum |
| C. | Potassium |
| D. | Manganese |
| Answer» C. Potassium | |
| 5461. |
Which one of the following nutrient serves as micro elements for plant growth [MP PMT 1995] |
| A. | Manganese, copper, calcium |
| B. | Sodium, potassium, boron |
| C. | Sodium, nickel, chlorine |
| D. | Copper, molybdenum, zinc |
| Answer» E. | |
| 5462. |
Which of the following is micro-element in plant [CBSE PMT 1996] |
| A. | Manganese |
| B. | Nitrogen |
| C. | Magnesium |
| D. | Calcium |
| Answer» B. Nitrogen | |
| 5463. |
Which one of the following elements plays an important role in biological nitrogen fixation [BHU 1985; CBSE PMT 1995; AIEEE 2004] |
| A. | Molybdenum |
| B. | Manganese |
| C. | Copper |
| D. | Zinc |
| Answer» B. Manganese | |
| 5464. |
'Petiole crack' is caused by the deficiency of |
| A. | Potassium |
| B. | Boron |
| C. | Molybdenum |
| D. | Iron |
| Answer» C. Molybdenum | |
| 5465. |
That element which helps in electron transport in the process of photosynthesis |
| A. | Zinc |
| B. | Molybdenum |
| C. | Boron |
| D. | Chlorine |
| Answer» E. | |
| 5466. |
The micronutrient least required by plants is [DPMT 1992] |
| A. | Cobalt |
| B. | Nickel |
| C. | Manganese |
| D. | Boron |
| Answer» C. Manganese | |
| 5467. |
Iron is present in which of the following |
| A. | Citrus fruits |
| B. | Mango |
| C. | Alurone grains |
| D. | None of the above |
| Answer» D. None of the above | |
| 5468. |
Places where there is copper deposit the soil is |
| A. | Suitable for plant growth |
| B. | Most suitable for plant growth |
| C. | Toxic |
| D. | None of the above |
| Answer» D. None of the above | |
| 5469. |
The elements arsenic, copper and murcury have which of the following effect |
| A. | Catalytic effect |
| B. | pH effect |
| C. | Toxic effect |
| D. | Antagonastic action |
| Answer» D. Antagonastic action | |
| 5470. |
Boron is absorbed as |
| A. | Borate ions |
| B. | Solution in water |
| C. | As boron trichloride |
| D. | None of the above |
| Answer» B. Solution in water | |
| 5471. |
Symptoms of manganese deficiency can be overcome by the use of |
| A. | Manganese sulphate |
| B. | Manganese dioxide |
| C. | Colloidal manganese |
| D. | None of these |
| Answer» B. Manganese dioxide | |
| 5472. |
? Which of the following micro-element is absorbed by leaves |
| A. | Phosphorous |
| B. | Boron |
| C. | Zinc |
| D. | Iron |
| Answer» D. Iron | |
| 5473. |
Mottle leaf in citrus plants is due to deficiency of |
| A. | Boron |
| B. | Magnesium |
| C. | Zinc |
| D. | None of these |
| Answer» D. None of these | |
| 5474. |
Top rot of tobacco is due to deficiency of |
| A. | Iron |
| B. | Manganese |
| C. | Molybdenum |
| D. | Boron |
| Answer» E. | |
| 5475. |
A trace element is an element which [CPMT 1971, 72] |
| A. | Is a radioactive and can be traced by Geiger counter |
| B. | Is required in very minute amounts |
| C. | Draws other element out of protoplasm |
| D. | Was one of the first to be discovered in protoplasm |
| Answer» C. Draws other element out of protoplasm | |
| 5476. |
Increased vigour of a hybrid, over the parents resulting from the crossing of genetically unlike organisms is called |
| A. | Heterosis |
| B. | Mutant |
| C. | Polyploid |
| D. | None of the above |
| Answer» B. Mutant | |
| 5477. |
A combination between an open pollinated variety and inbreed line is called |
| A. | Double cross |
| B. | Top cross |
| C. | Synthetic cross |
| D. | None of the above |
| Answer» C. Synthetic cross | |
| 5478. |
Technique employed in plant hybridization |
| A. | Emasculation |
| B. | Bagging |
| C. | Crossing |
| D. | All the above |
| Answer» E. | |
| 5479. |
What is the advantage of clonal selection |
| A. | Varieties developed are stable and easy to maintain |
| B. | Hybrid vigour is easily utilized |
| C. | Only method to improve clonal crops |
| D. | All the above |
| Answer» E. | |
| 5480. |
Clonal selection technique is not useful for |
| A. | Sugarcane |
| B. | Wheat |
| C. | Potato |
| D. | Onion |
| Answer» C. Potato | |
| 5481. |
Superority of hybrid over parent is [BVP 2004] |
| A. | Heterosis |
| B. | Selection |
| C. | Hybridized progeny |
| D. | Hybrid vigour |
| Answer» E. | |
| 5482. |
Piece of sterile plant tissue to be used for tissue culture under aseptic condition is [Orissa PMT 2002] |
| A. | Inoculant |
| B. | Explant |
| C. | Clone |
| D. | Somaclone |
| Answer» C. Clone | |
| 5483. |
Triticale is the hybrid between wheat and [CBSE PMT 2001] |
| A. | Maize |
| B. | Barley |
| C. | Rye |
| D. | Bean |
| Answer» D. Bean | |
| 5484. |
Mutations are caused due to [CPMT 1999] |
| A. | Radioactive mutagens |
| B. | Chemical mutagens |
| C. | Radiation mutagens |
| D. | Change in base sequence |
| Answer» E. | |
| 5485. |
The new varieties of plants are produced by [CBSE PMT 1999] |
| A. | Selection and hybridization |
| B. | Mutation and selection |
| C. | Introduction and mutation |
| D. | Selection and introduction |
| Answer» B. Mutation and selection | |
| 5486. |
Regarding pureline selection which statement is most correct |
| A. | It is always practiced in self pollinated crops |
| B. | In it large number of plants are selected |
| C. | In it about 6 years time is taken for the production of a variety |
| D. | All the above |
| Answer» B. In it large number of plants are selected | |
| 5487. |
The reason for vegetatively reproducing crop plants to suit for maintaining hybrid vigour is that [CBSE PMT 1998] |
| A. | They can be easily propagated |
| B. | They have a longer life span |
| C. | They are more resistant to diseases |
| D. | Once a desire hybrid produced, no changes of losing it |
| Answer» E. | |
| 5488. |
Plants having similar genotypes produced plant breeding are called [MP PMT 1998] |
| A. | Clone |
| B. | Haploid |
| C. | Autopolyploid |
| D. | Genome |
| Answer» B. Haploid | |
| 5489. |
Which of the following condition is hybrid breakdown [AFMC 1997] |
| A. | Failure of hybrid adult to produce functional gametes |
| B. | Failure of the fusion of ova and sperm plant breed of two species |
| C. | Failure of hybrid zygote to develop into an offspring |
| D. | None of these |
| Answer» D. None of these | |
| 5490. |
Which one of the following chemical induces polyploidy in plant cells [MP PMT 1992, 96] |
| A. | 2, 4-dichlorophenoxy acetic acid |
| B. | Rifampicin |
| C. | Cytokinenine |
| D. | Colchicine |
| Answer» E. | |
| 5491. |
Heterosis means [CPMT 1995] |
| A. | Hybrid vigour |
| B. | Hybrids are weak |
| C. | Hybrids are weak as well as vigorous |
| D. | Hybrids are neither weak nor vigorous |
| Answer» B. Hybrids are weak | |
| 5492. |
The alkaloid from Colchicum autumnale of Liliaceae induces [EAMCET 1995] |
| A. | Sterility |
| B. | Dormancy |
| C. | Cell division |
| D. | Polyploidy |
| Answer» E. | |
| 5493. |
Mutations caused by mutagenic agents are termed as [EAMCET 1995] |
| A. | Spontaneous mutations |
| B. | Chemical mutations |
| C. | Induced mutations |
| D. | Chromosomal mutations |
| Answer» D. Chromosomal mutations | |
| 5494. |
Desired improved variety of economically useful crops are raised by [MP PMT 1994; BHU 2004] |
| A. | Natural selection |
| B. | Hybridization |
| C. | Mutation |
| D. | Biofertilizer |
| Answer» C. Mutation | |
| 5495. |
Regarding mass selection which statement is most suitable |
| A. | As old as agriculture itself |
| B. | Followed by all farmers every year |
| C. | Usually practiced in cross pollinated crops |
| D. | All the above |
| Answer» E. | |
| 5496. |
The Triticum aestivum wheat is [CPMT 1995; MP PMT 1993, 95, 2002; DPMT 2003; BVP 2004] |
| A. | Haploid (7 chromosome) |
| B. | Diploid (14 chromosome) |
| C. | Tetraploid (30 chromosome) |
| D. | Hexaploid (42 chromosome) |
| Answer» E. | |
| 5497. |
The process of removing stamens from the flower bud during hybridization is called [MP PMT 1993, 95, 2001; MHCET 2000; CBSE PMT 2001; BHU 2002] |
| A. | Crossing |
| B. | Selfing |
| C. | Emasculation |
| D. | Caping |
| Answer» D. Caping | |
| 5498. |
The hybrids are generally found to be superior to their parents, it is because of [MP PMT 1993] |
| A. | Homozygosity |
| B. | Hybrid vigour |
| C. | Parents are generally weak |
| D. | None of these |
| Answer» C. Parents are generally weak | |
| 5499. |
Which of the following is most effective chemical mutagene [MP PMT 1992] |
| A. | Methane |
| B. | Guanine |
| C. | Carbon tetrasulphide |
| D. | Caffeine |
| Answer» D. Caffeine | |
| 5500. |
What are micro-mutations [MP PMT 1992] |
| A. | Union of chromosomes |
| B. | Reduction of chromosomes |
| C. | Changes in genes |
| D. | Polyploidy |
| Answer» D. Polyploidy | |