Vessels vs Tracheids Similarities and Differences between Vessels and Tracheids
Vessels and tracheids are the components of xylem, the water and minerals conducting tissue in plants. Vessels and tracheids are jointly known as the tracheary elements of the xylem. Even though, both vessels and tracheids show functional similarities, they do possess some striking differences. The present post describes the similarities and differences between vessels and tracheids.
Similarities between Vessels and Tracheids
Ø Both vessels and tracheids are the components of xylem.
Ø Both are dead cells at maturity.
Ø Both can transport water.
Ø Both possess secondary lignified cell wall.
Ø Both are present in primary and secondary xylem.
Xylem vs Phloem Similarities and Differences between Xylem and Phloem
Xylem and Phloem are the components of the vascular tissue system in plants. In the young parts of the stem, the xylem and phloem are together organized as vascular bundles. Both xylem and phloem are complex tissues which composed of more than one types of cells. The present post describes the similarities and differences between Xylem and Phloem.
Similarities between Xylem and Phloem
Ø Both xylem and phloem are complex tissue composed of more than one type of cells.
Ø Both are the components of vascular tissue system of plants.
Ø Both contain living and dead cells.
Ø Both contain parenchymatous cells.
Ø Both contain fibres.
Ø In primary vascular bundles both xylem and phloem are differentiated into proto- and meta- elements.
Ø Both shows primary and secondary growth.
Ø Both xylem and phloem are developed from the cambium.
Ø Both the term ‘xylem’ and ‘phlolem’ are proposed for the first time by Carl Wilhelm von Nägeli
SET Exam December 2015: Zoology Paper II with Answer Key
Official / Original Previous Year (Old) Solved Question Paper of Kerala State Eligibility Test (SET) Examination December 2015 in Zoology (Life Science) with Answer Key and Explanations as a single Downloadable PDF file. SET Zoology aspirants can freely download the question paper for your exam preparation. Please feel free to inform us (Contact: Admin) if you find any mistakes in the answer key. To download the question paper as a single PDF file, please click on the download button below.
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SET Exam December 2015: Botany Paper II with Answer Key
Official / Original Previous Year (Old) Solved Question Paper of Kerala State Eligibility Test (SET) Examination December 2015 in Botany (Life Science) with Answer Key and Explanations as a single Downloadable PDF file. SET Botany aspirants can freely download the question paper for your exam preparation. Please feel free to inform us (Contact: Admin) if you find any mistakes in the answer key. To download the question paper as a single PDF file, please click on the download button below.
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Kerala PSC Botany Lecturer / Assistant Professor Original Solved Question Paper: 2003 Exam (Question Paper Code: 250/2003)
Original solved question paper of Kerala PSC Botany Lecturer/Assistant Professor examination conducted by Kerala PSC (Kerala Public Service Commission) for the recruitment / appointment of Botany Lecturer/Assistant Professor in Government Colleges of Kerala under the Directorate of Collegiate Education, Trivandrum, Kerala. The test was conducted in the year 2003 and the Question Paper Code Number is 250/2003. All questions were in MCQ (Multiple Choice Questions) format. A detailed answer key with explanations is given at end of each set.
Part – 2/5 (Questions 21 – 40)
21. Pro-phage is:
a. DNA incorporated with the host DNA b. DNA or RNA in the early stages of infection c. DNA of bacterial cell before viral infection d. DNA present is only an incomplete fragment
22. ‘Bars of Sanio’ are the crescent shaped bars of cellulose present:
a. Near the pits on tracheids of Gymnosperm wood b. On the secondary wood of Angiosperms c. On the tracheids of Pteridophytes d. On the extensive periderm of Cycas wood
23. Bryophytes exhibit alternation of generation:
a. Homomorphic b. Heteromorphic c. Isomorphic d. No definite change in life cycle
24. DNA sequences that suppress promoter activity are called:
a. Enhancers b. Reporters c. Responsive elements d. Silencers
25. Synthetic seeds are produced by:
a. Encapsulation of somatic embryo with matrix for storing b. Cryopreservation of somatic embryo for long storage c. Preservation of seeds by covering with organic polymers d. Encapsulation of normal seed with a resistant matrix