Statement I: | Parenchyma is living but collenchyma is dead tissue. |
Statement II: | Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms. |
A. | Companion cells help in maintaining the pressure gradient in the sieve tubes. |
B. | Gymnosperms lack vessels in their xylem |
C. | The xylem vessels are devoid of cytoplasm |
D. | Xylem fibres may be septate or aseptate |
E. | A mature sieve element in phloem possesses cytoplasm, vacuole and nucleus. |
Statement I: | In collenchyma, cell walls are thickened at corners due to deposition of cellulose, hemicellulose and pectin. |
Statement II: | Sclerenchyma consists of lignified cell walls and possesses pits. |