NEET 2016
- Exam
- NEET
- Year
- 2016
- Subject
- Botany
- Chapter
- Anatomy of Flowering Plants
NEET 2016 · Botany · Anatomy of Flowering Plants
The balloon-shaped structures called tyloses
The balloon-shaped structures called tyloses
Options
- AOriginate in the lumen of vessels
- BCharacterize the sapwood
- CAre extensions of xylem parenchyma cells into vessels
- DAre linked to the ascent of sap through xylem vessels
Correct answer
C. Are extensions of xylem parenchyma cells into vessels
Step-by-step solution
Tyloses are balloon-shaped structures in xylem vessels developed by xylem parenchyma cells.
Malpighi (1686) for the first time reported the ‘balloon-shaped sacs’ in the lumen of vessels of heartwood and he named it as tyloses based on the Greek word ‘Thyllen’ meaning ‘bag’ or ‘container’. Tyloses development occurs through the pit-pairs connecting parenchyma and tracheids or vessels. Sometimes many tyloses originate from a single parenchymatous cell. The tyloses completely fill the lumen rich in the tracheids and vessels of heartwood than sapwood.
Malpighi (1686) for the first time reported the ‘balloon-shaped sacs’ in the lumen of vessels of heartwood and he named it as tyloses based on the Greek word ‘Thyllen’ meaning ‘bag’ or ‘container’. Tyloses development occurs through the pit-pairs connecting parenchyma and tracheids or vessels. Sometimes many tyloses originate from a single parenchymatous cell. The tyloses completely fill the lumen rich in the tracheids and vessels of heartwood than sapwood.