Which of the following cells have lignin?

1. parenchyma
2. chlorenchyma
3. collenchyma
4. sclerechyma

Xylem consists of

1. vessels, collenchyma and xylem fibres
2. tracheids, xylem fibres and xylem parenchyma
3. sieve cells, xylem fibres and xylem parenchyma
4. vessels, tracheids, fibres and xylem parenchyma.

Phloem consists of

1. vessels, collenchyma and phloem fibres.
2. tracheids, phloem fibres and phloem parenchyma.
3. sieve cells, phloem fibres and phloem parenchyma.
4. vessels, sieve tubes, xylem fibres and phloem parenchyma.

These are elongated cells with minute pores.

1. phloem parenchyma
2. sieve cells
3. phloem fibres
4. companion cells