Bissoy.com
Doctors Medicines MCQs Q&A

With reference to the criteria for the essentiality of an element in plants, consider the following statements: A. element must be absolutely necessary for supporting normal growth and reproduction. B. the element must be directly involved in the metabolism of the plant. Select the correct answer using the code given below:

With reference to the criteria for the essentiality of an element in plants, consider the following statements: A. element must be absolutely necessary for supporting normal growth and reproduction. B. the element must be directly involved in the metabolism of the plant. Select the correct answer using the code given below: Correct Answer Both A and B

The correct answer is Both A and B.

  • The concept of Criteria of Essentiality of Nutrients was put forward by Arnon and Stout in the year 1939.

Key Points

  • They considered 16 elements essential for plant nutrition.
  • For an element be considered as an essential nutrient, the element must be absolutely necessary for supporting normal growth and reproduction.
  • In the absence of the element, the plants do not complete their life cycle.
  • The requirement of the element must be specific and it should not be replaceable by any other element.
  • The element must be directly involved in the nutrition and metabolism of the plant and must have a direct influence on plants.

Additional Information

  • Essential Nutrients for Plant Nutrients-
Macro Nutrients  Micro Nutrients  
Nitrogen is necessary for the formation of amino acids, proteins, DNA and RNA. It is essential for plant cell division and vital for plant growth. Boron is an essential component of cell wall formation and is key for the germination of pollen grains and the growth of pollen tubes.
Phosphorus promotes early root formation and growth and is involved in photosynthesis, respiration, energy storage and transfer, cell division and enlargement.  zinc aids plant growth hormones and enzyme system and is necessary for chlorophyll production and carbohydrate formation.
Potassium is involved in carbohydrate metabolism and the breakdown and translocation of starch. Potassium also enhances disease resistance and improves winter hardiness. Copper plays a major role in photosynthesis. This element improves the flavour of fruits and vegetables and can help prevent ergot in cereals.
Calcium increases fruit set and quality and is important for continuous cell division and formation (regulates hormonal activity). Manganese aids in chlorophyll synthesis and increases the availability of phosphorus and calcium.
Magnesium the centre molecule of chlorophyll improves the utilization and mobility of phosphorus. Iron promotes the formation of chlorophyll and acts as an oxygen carrier.
Sulfur is an integral part of amino acids. It helps develop enzymes, vitamins and oil contents, and aids in seed formation. Chloride promotes crop health and enhances the maturity of small grains on some soils.
  Molybdenum is needed to convert inorganic phosphates to organic forms in the plant and aids in the modulation of legumes, especially in acidic soils.

Related Questions

Study the following information carefully and answer the question given below. The following criteria have been introduced for the appointment of a scientist in a research organization. Candidates: 1) Must be a postgraduate in Mathematics/Physics/Chemistry subject with a minimum of 65% marks 2) Age should not be less than 26 years and not more than 35 years as on 01-01-2018 3) Must have a post-doctoral degree with more than 50% marks 4) Should have a minimum of 3 years of experience in the above fields 5) Should be prepared to be under probation for one year If the candidate satisfies all the criteria other than (3), he may be designated as Project Scientist. If the candidate satisfies all the above criteria other than (3) and (4) he may be referred for the post of Junior Scientist. If the candidate fulfills all the above criteria with 7 years of experience in the relevant fields, he/she can be designated as a Senior Scientist. If the candidate fulfills all the above criteria with 12 years of experience in the relevant field, he/she can be designated as Principal Scientist. Varun's age is 27 years as of 1/1/18, he obtained his bachelor's and master's degree in chemistry with 72% and 76% marks respectively. He also had 4 years of experience in the relevant field and was ready to be under probation for one year of the job. to what position he may be assigned
Consider the following statements regarding sexual reproduction in plants: 1. Reproduction in plants takes place only through asexual methods. 2. Reproduction in spirogyra takes place through the process of fragmentation. 3. Vegetative propagation in plants can be achieved only by natural method. Which of the statements from above is/are correct?
The following are the criteria set by a Retail outlet for the selection of candidates for the post of Store In charge in a reputed mall. 1. The candidate must be a graduate in any stream with minimum of 50% marks. 2. The candidate must have Minimum of 5 years of Sales experience in Retail. 3. The age of the candidate should not be less than 25 years and more than 34 years as on 1st October, 2019. (a) If a candidate satisfies all the criteria except 2 as given above but has an MBA degree and has minimum of 2 years of work experience in sales, she/he must be sent to the General Manager, Recruitment for further interview. (b) If a candidate satisfies all the criteria except 3, but has more than 5 years experience as a Group Manager and above in Sales managing a team of sales executives, then she/he must be sent to the Regional Manager, Sales & Marketing, for further interview Based on the above criteria and conditions, analyze and decide which of the following course of action should be taken for the candidate whose description is provided below. Please note that you are not to assume anything other than the given information. Sujoy is a graduate with 55% marks and MBA through Correspondence. He was born on Sept 20, 1990. He has 1 year of work experience as a sales executive and 2 years of experience as a Group Manager, Sales. On the basis of the information as given above, which of the following decisions would be appropriate
Which of the following statements refers to the process of 'parthenogenesis'? 1. It is a natural form of asexual reproduction in which the growth and development of embryos occur without fertilisation. 2. It is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. 3. It is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg inside of the female's body  Select the correct answer using the codes given below.
Consider the following statements and choose the correct answer:
1. Intense or strong light retards the growth of shoot
2. Shade plants are shorter and stockier than sun plants
3. Shade plants have dense covering of hairs while sun plants are less hairy
4. The stems of shade plants are taIler and more branched than that of sun plants
Study the following information carefully and answer the given questions. For a recruitment process in an ACCOUNTING organization, the candidates need to possess the following qualifications criteria: i) He/she must be a graduate in commerce with at least 60% marks. ii) He/she must be at least 24 years of age and not more than 40 years as of 1-7-2016. iii) He/she must have post-qualification work experience of at least 2 years. iv) He/she should have secured 55% marks in the selection process. However, if the candidate fulfills the above-mentioned criteria except: (A) at (i), and if the candidate is not a graduate in commerce but has a post-graduation degree in finance with a minimum of 60% marks, he/she should be referred to the Finance Manager of the organization. (B) at (iii), and if the candidate fulfills all the eligibility criteria of post-qualification work experience but has secured 75% marks in the selection process, he/she may be referred to the Trainee Accountant. Based on the above information, study carefully whether the following candidates are eligible for the recruitment process and mark your answer as follows. You are not to assume anything other than the information provided in each question. All the cases are given to you as of 1-7-2016. Snehlata’s date of birth is 6.2.1990. She has done her graduation and post-graduation in Commerce and secured 61% and 63% marks respectively. She has post-qualification work experience as a Senior Accountant of 3.5 years. She has secured 58.5% marks in the selection process.
Consider the following criteria of classification in reference to the five Kingdom classification and choose the correct criteria, using the codes given below : (A) Cell type (B) Level of organisation (C) Mode of reproduction (D) Mode of nutrition
Consider the following statements.
1. Fragmentation is the common method of reproduction in algae, fungi and lichens.
2. Organisms which reproduce by fission are yeast and bacteria.
3. Reproduction by budding occurs in yeasts.
Which of the statements given above are correct about asexual reproduction methods?
In each question below is given a statement numbered I, II and III. An assumption is something supposed or taken for granted. You have to consider the following assumption and decide which of the assumption is implicit in the statement. Statement: The June 2018 quarter results of Infosys reflect that the investors waiting for the company to perform as good, if not better, than its largest peer Tata Consultancy Services (TCS) may have to wait a little longer. Infosys, the country’s second-largest software exporter reported slower sequential growth in revenue and profit than TCS for the June quarter (Q1). It also lagged on the fronts of employee attrition and growth in the banking, financial services, and insurance (BFSI) vertical.  Assumptions: I. On the positive side, Infosys continued to add large clients – four in the above $100-million billing category compared with the previous quarter. It continued to retain guidance of 6-8% revenue growth for FY19 while retaining the operating margin band of 22-24%. II. In the near term, the stock performance of TCS is likely to overshadow Infosys given the difference in their growth trajectories. III. The growth momentum of Infosys has slowed relative to TCS. The year-on-year growth in trailing 12-month (TTM) revenue of Infosys in each of the four quarters up to the June 2018 quarter has lagged TCS after leading in the previous five quarters.
Consider the following statements and choose the correct answer:
1. The C4 plants can absorb CO2 even from a much low CO2 concentration when the C3 plants fail to avail it
2. The C4 plants require less energy to fix CO2 as compared to C3 plants
3. C4 plants are better adapted to tropical and desert areas where sunlight is more intense and the growing season is longer
4. Maize is a C4 plant