-
Engineering and Architecture
Exams
Colleges
Predictors
Resources
-
Computer Application and IT
Quick Links
Colleges
-
Pharmacy
Colleges
Resources
-
Hospitality and Tourism
Colleges
Resources
Diploma Colleges
-
Competition
Other Exams
Resources
-
School
Exams
Top Schools
Products & Resources
-
Study Abroad
Top Countries
Student Visas
-
Arts, Commerce & Sciences
Exams
Colleges
Upcoming Events
Resources
-
Management and Business Administration
Colleges & Courses
Predictors
-
Learn
Online Courses
Engineering Preparation
Medical Preparation
-
Online Courses and Certifications
Top Streams
Specializations
- Digital Marketing Certification Courses
- Cyber Security Certification Courses
- Artificial Intelligence Certification Courses
- Business Analytics Certification Courses
- Data Science Certification Courses
- Cloud Computing Certification Courses
- Machine Learning Certification Courses
- View All Certification Courses
Resources
-
Medicine and Allied Sciences
Colleges
Predictors
Resources
-
Law
Resources
Colleges
-
Animation and Design
Predictors & Articles
Colleges
Resources
-
Media, Mass Communication and Journalism
Colleges
Resources
-
Finance & Accounts
Top Courses & Careers
Colleges
Get Answers to all your Questions
- #Biology
- #Medical
- #Plant Physiology
- #National Eligibility Cum Entrance Test
- #National Eligilibility Cum Entrance Test
- #Class 11
Which one of the following statements describes the process of phloem loading?
Triose phosphate is transported from the chloroplast to cytosol.
Sugars are transported into the sieve elements and companion cells.
Sugars are transported from producing cells in the mesophyll to cells in the vicinity of the sieve elements.
Solutes are transported from roots to the shoots.
Answers (1)
The statement "Sugars are transported into the sieve elements and companion cells" accurately describes the process of phloem loading. Phloem loading is the process by which sugars, mainly sucrose, are transported from the source tissues (such as mature leaves) to the sieve elements and companion cells in the phloem.
During phloem loading, sucrose is synthesised in the mesophyll cells of the leaves through photosynthesis. It is then actively transported from the mesophyll cells into the companion cells and sieve elements of the phloem. This movement of sucrose is facilitated by specialised transport proteins, such as sucrose transporters.
Once inside the sieve elements, the sucrose is able to flow through the phloem sieve tubes, which are interconnected structures formed by the sieve element cells. The companion cells, which are connected to the sieve elements by plasmodesmata, provide metabolic support and energy for the sieve elements, as they are highly metabolically active but lack some essential organelles.
Overall, phloem loading involves the active transport of sugars from source tissues into the sieve elements and companion cells, allowing for the long-distance transport of carbohydrates to various sink tissues in the plant, where the sugars are utilised for growth, storage, or other metabolic processes. Hence, the correct answer is option 2.
NEET 2024 Most scoring concepts
- Just Study 32% of the NEET syllabus and Score up to 100% marks
