Q5. Assertion: collenchyma gives mechanical support to young stems. Reason: its living cells are thickened at the corners. Are both true, and does the reason explain the assertion?
Both are true, and the reason explains the assertion.
Q6. Which is the first-formed xylem called, and which the later xylem?
Protoxylem and metaxylem.
Q7. In which plant parts would you look for sclereids?
In the shells of nuts, the pulp of guava, pear and sapota, the seed coats of legumes and the leaves of tea.
Q8. Which phloem element is absent in most monocotyledons?
Phloem parenchyma.
Q9. Why does NCERT say plant growth is indeterminate?
Because meristems at certain locations keep dividing throughout the plant’s life (NCERT Chapter 13, page 167).
Q10. What carries food in phloem, and what keeps it working?
The sieve tubes carry food; their companion cells, which have nuclei, keep them working.