A piece of wood having no vessels (trachea) must belong to

1. teak

2. mango

3. pine

4. palm

14. Fibres are likely to be absent in

(a) secondary phloem

(b) secondary xylem

(c) primary phloem

(d) leaves

A vesselless piece of stem possessing prominent sieve tubes would belong to

1. Pinus

2. Eucalyptus

3. Grass

4. Trochodendron