English
Hindi

Question

Download Solution PDF

Photochemically generated ATP is consumed in which one of the following phases of Calvin‐Benson cycle?

This question was previously asked in
CSIR-UGC (NET) Life Science: Held on (17 Feb 2022 Shift 1)
Download PDF Attempt in App
View all CSIR NET Papers >
  1. Only carboxylation
  2. Only regeneration
  3. Carboxylation and reduction
  4. Reduction and regeneration

Answer (Detailed Solution Below)

Option 4 : Reduction and regeneration
Free Tests
View all Free tests >
Free
Seating Arrangement
10 Qs. 20 Marks 15 Mins
Start Now

Detailed Solution

Download Solution PDF

The correct answer is Option 4 i.e. Reduction and regeneration

Key Points

  • The Calvin cycle is a step in the photosynthetic process that converts atmospheric CO2 into sugar phosphates for use in a broader metabolism that supports the growth and development of plants.
  • In the stroma of plant cell chloroplasts, the Calvin cycle occurs.
  • There are eleven enzymes involved in this cycle, which has three stages: 
  1. Carboxylation - carried out by the Rubisco enzyme (ribulose-1,5-bisphosphate carboxylase oxygenase)
  2. Reduction - of the C3 acids produced during the carboxylation reaction (the stage of sugar formation)
  3. Regeneration - of ribulose-1,5-bisphosphate (RUBP), which is the CO2-acceptor molecule of Rubisco enzyme.

Explanation:

  • Reduction and regeneration are the two stages where ATP is consumed as shown in the figure above,
  • Thus option 4 is the correct option and other mentioned options are false.

Download Solution PDF
Latest CSIR NET Updates

Last updated on Jun 5, 2025

-> The NTA has released the CSIR NET 2025 Notification for the June session.

-> The CSIR NET Application Form 2025 can be submitted online by 23rd June 2025

-> The CSIR UGC NET is conducted in five subjects -Chemical Sciences, Earth Sciences, Life Sciences, Mathematical Sciences, and Physical Sciences. 

-> Postgraduates in the relevant streams can apply for this exam.

-> Candidates must download and practice questions from the CSIR NET Previous year papers. Attempting the CSIR NET mock tests are also very helpful in preparation.

Exams Tests Super Practice

More Photosynthesis Questions

Q1.Biosynthesis of glutamine and asparagine is sensitive to light and to the availability of reduced carbon. Following are a few statements regarding the same. A. Expression of the plastid-localized Glutamine Synthetase (GS) gene is upregulated by light. B. Darkness promotes the expression of Asparagine Synthetase (AS) gene. C. Expression of GS is inhibited by sucrose while that of AS is upregulated by sucrose. D. Asparagine is a more efficient carbon source than glutamine. Which one of the following options represents the combination of all correct statements?
Q2.In C4 plants, Calvin cycle
Q3.Thylakoids removed from chloroplasts were kept in illuminated culture having CO2 and water. It did not produce sugar because of
Q4.Which one of the following statements related to photosynthesis is NOT correct?
Q5.During light reaction in photosynthesis, electron is transported in electron transport chain (ETC) and produces ATP and NADPH in the process. Following are certain statements regarding ETC during light reaction: A. Electron from P680 moves first to quinone and then to the pheophytin B. P700 can receive electrons from plastocyanin C. NADPH is produced at the end of light reaction D. The hydrogen ions produced during light reaction gets concentrated in thylakoid lumen Choose the correct answer from the options given below:
Q6.Photochemically generated ATP is consumed in which one of the following phases of Calvin‐Benson cycle?
Q7.If a plant with green leaves is kept in a dark room with only green light on, which one of the following would we observe?

More System Physiology Plant Questions

Q1.Given below are figures representing four different situations/examples of genetic and environmental (temperature) effects on plant height in two varieties of a plant species. In figures A, C and D, solid and dashed lines represent the mean values of plant height for the two varieties G1 and G2, respectively. In figure B, the solid and dashed lines overlap. Given below are four statements explaining the four figures. i. Plant height is influenced primarily by the genotype of the two varieties. ii. Variation in plant height is influenced only by the temperature and genotype has no effect. iii. Genotype and temperature collectively have an additive effect on plant height. iv. Both genotype and environment have an effect on plant height with the two varieties responding differently to the environment. Which one of the following options correctly matches the figures and their corresponding explanations?
Q2.Biosynthesis of glutamine and asparagine is sensitive to light and to the availability of reduced carbon. Following are a few statements regarding the same. A. Expression of the plastid-localized Glutamine Synthetase (GS) gene is upregulated by light. B. Darkness promotes the expression of Asparagine Synthetase (AS) gene. C. Expression of GS is inhibited by sucrose while that of AS is upregulated by sucrose. D. Asparagine is a more efficient carbon source than glutamine. Which one of the following options represents the combination of all correct statements?
Q3.Sucrose-phosphate synthase (SPS) is a key enzyme in the biosynthesis of sucrose in plants. Following are certain statements regarding SPS: A. Uridine-diphosphate glucose and fructose-6-phosphate are the substrates for SPS. B. SPS directly converts its substrate into sucrose. C. Phosphorylation activates while dephosphorylation inactivates SPS. D. SPS converts its substrate into sucrose-6-phosphate which is then converted to sucrose by the action of sucrose-phosphate phosphatase. E. Glucose 6-phosphate activates while Pi inactivates SPS. Which one of the following options represents the combination of all correct statements?
Q4.Following statements were made with respect to plant steroid hormones. A. The receptors for plant steroid hormones are found in the nucleus, similar to animal steroid hormones. B. There are multiple pathways for the plant steroid hormone biosynthesis involving cytochrome P450 class of enzymes. C. The first plant steroid hormone was isolated from male gametophytes. D. Plants deficient for the steroid hormone brassinosteroid show underproliferation of phloem and overproliferation of xylem cells. E. Castasterone is a plant steroid hormone abundant in the vegetative tissues of the plant. Which one of the following options represents the combination of all correct statements?
Q5.The nitrogen fixing bacterium, Rhizobium leguminosarum, isolated from the root nodules of garden pea (Pisum sativum) is cultured in a petri plate containing appropriate nutrient agar medium. A bacterial colony was picked and inoculated into a liquid growth medium to scale up the culture for the production of biofertilizer. Which one of the following statements is correct?
Q6.Following are certain statements regarding Crassulacean Acid Metabolism (CAM) plants: A. The HCO3- concentration is enriched in the cytosol during night by the CO2 coming from the external atmosphere through the open stomata and the mitochondrial respiration. B. Oxaloacetate produced by the action of PEPCase is stored in the vacuole during dark. C. During light, oxaloacetate produces malate that provides CO2 for Calvin Benson cycle in the chloroplast. D. During dark, phosphoenolpyruvate is produced by the breakdown of starch present in the chloroplast. E. CAM is a mechanism of concentrating CO2 around Rubisco by keeping stomata closed during day. Which one of the following options represents the combination of all correct statements?
Q7.SLN1 receptor, a part of a two-component system, is required for osmoregulation in yeast. The yeast mutant (siln 1) lacking the SLN1 receptor protein dies. A researcher tries to rescue the mutant by expressing an Arabidopsis gene for the cytokinin receptor, CRE1, which like SLN1 is also a histidine kinase that acts through a two-component system. The following statements are made regarding the outcome of the experiment. A. SLN1 and CRE1 proteins respond to the same external signals and therefore, CRE1 rescues the yeast mutant. B. As CRE1 cannot interact with the downstream signaling pathway in the yeast, it will not rescue the yeast mutant. C. CRE1 will rescue the yeast mutant, only if cytokinin is present. D. The effector domains of CRE1 and SLN1 proteins are sufficiently similar and therefore, CRE1 can induce the downstream signaling pathway and rescue the yeast mutant. Which one of the following options represents the combination of all correct statements?
Q8.In the classic ABCDE model of flower development, different combinations of ABCDE class genes result in different whorls of organs. Which one of the following models would likely give rise to unisexual flower structures?
Q9.ABA plays an important role in plant response to water stress. In the table below, column X represents some of the important enzymes in ABA biosynthesis/degradation pathways, while column Y summarizes the major function of these enzymes.   Column X (Enzymes)   Column Y (Functions) A. 9-cis-epoxycarotenoid dioxygenase l. Involved in the oxidative pathway of ABA catabolism B. Cytochrome P450 monooxygenase (CYP707A3) ll. Production of a sugar-conjugated form of ABA C. ABA glucosyltransferase lll. Xanthoxin production  D. β-glucosidase lV. Releases ABA from its sugar-conjugated form Choose the option showing the correct match between column X and column Y?
Q10.Which one of the following is a correct combination of four carbon intermediates formed during C4 photosynthesis in plants?

More Life Sciences Questions

Q1.Which of the following plants of the Fabaceae family is widely used as fodder and a leafy vegetable for human consumption?
Q2.The CDS of the shortest isoform of human gene 'A' is cloned into a 3.3 kb vector under a CMV promoter at the BamHI and Xhol sites (pCMV-A vector). From the agarose gel and SDS-PAGE images shown above, which one of the following is most likely true for protein A in HeLa cells:
Q3.A researcher used CRISPR-Cas9 system and observed a different type of mutation in two alleles of a target gene in a T0 transgenic plant. These mutations are designated as follows: Allele 1: addition of a nucleotide Allele 2: deletion of a nucleotide The observed mutations can be classified as
Q4.Which one of the following options represents all correct matches between Column X and Column Y?   Column X: Microorganism   Column Y: Host receptor  A. Influenza virus i. N-acetylglucosamine B. Entamoeba histolytica  ii. CD44  C. Streptococcus pyogenes iii. Sialic acid residues of glycoproteins and glycolipids D. Human immunodeficiency virus iv. CD4
Q5.The mouse homozygous null mutant for a gene bfg always dies mid-gestation. Chimeric mice made of bfg null cells and wild-type cells have healthy pups. When the developing brain of these pups is examined, they have more than two hippocampi. Closer examination reveals bfg null cells at the centre of these supernumerary hippocampi. Which of the following inferences can correctly be drawn from this experiment?
Q6.Some features mentioned below are important for the segregation of homologous chromosomes in meiosis I. A. Synaptonemal complex formation between homologous chromosomes. B. Degradation of cohesins at the chromosome arms. C. Retention of cohesins at the centromeres. D. Bi-orientation of kinetochores of sister chromatids. Which one of the following options has all correct features?
Q7.Here is some data for a cohort of 400 individuals of a species whose abundance was tracked for 6 years (its maximum lifespan). For one-year age intervals from birth to 6 years, you have the following numbers of survivors, 400, 200, 100, 40, 20, 10, and 0. The corresponding per capita birth rates are 0.1, 2.0, 3.0, 4.0, 4.0, 3.0 , and 0.0. What is the basic reproductive rate R0?
Q8.Molecular phylogeny indicates that whales are closely related to the artiodactyls. Given this information, select the phylogenetic tree that shows the correct set of terrestrial animals with which modern whales share their most recent ancestry.
Q9.Four groups of students (A-D) were asked to determine whether memory B cells generated in mice immunized with ovalbumin (OVA), in Complete Freund's adjuvant (CFA), could mount a secondary antibody response (recall response) to OVA in vitro. The groups did the following experiments: Group A students harvested serum from the mice, loaded it on OVA-coated ELISA plates and showed that lgG and lgA anti-OVA antibodies were present. Group B students harvested long-lived plasma cells from bone marrow of the mice, plated them in culture for 5 days and showed anti-OVA antibodies in supernatant by ELISA. Group C students infected an epithelial cell line with the virus and showed that spleen cells from the mice could kill the infected targets. Group D students stimulated spleen cells from the mouse with OVA for 5 days and showed anti-OVA antibodies in supernatant by ELISA. Which one of the following options represents group(s) that did the correct experiment?
Q10.Given below are figures representing four different situations/examples of genetic and environmental (temperature) effects on plant height in two varieties of a plant species. In figures A, C and D, solid and dashed lines represent the mean values of plant height for the two varieties G1 and G2, respectively. In figure B, the solid and dashed lines overlap. Given below are four statements explaining the four figures. i. Plant height is influenced primarily by the genotype of the two varieties. ii. Variation in plant height is influenced only by the temperature and genotype has no effect. iii. Genotype and temperature collectively have an additive effect on plant height. iv. Both genotype and environment have an effect on plant height with the two varieties responding differently to the environment. Which one of the following options correctly matches the figures and their corresponding explanations?
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
support@testbook.com
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Hot Links： teen patti wink teen patti yas teen patti master