The balloon-shaped structures called tyloses
1. are linked to the ascent of sap through xylem vessels
2. originate in the lumen of vessels
3. characterize the sapwood
4. are extensions of xylem parenchyma cells into vessels

Identify the wrong statement in context of heartwood:
1. Organic compounds are deposited in it
2. It is highly durable
3. It conducts water and minerals efficiently
4. It comprises dead elements with highly lignified walls

Which of the following is made up of dead cells?
1. Xylem parenchyma
2. Collenchyma
3. Phellem
4. Phloem

The vascular cambium normally gives rise to

Stomata in grass leaf are

Casparian strips occur in

Secondary xylem and secondary phloem in dicot stem are produced by
1. Apical meristems
2. Axillary meristems
3. Phellogen
4. Vascular cambium

Plants having little or no secondary growth are

Cuticle:
1. is a covering, both outside and inside of the epidermis
2. is well developed in roots
3. helps in prevention of water loss
4. is a proteinaceous layer

In a dicot stem, the pericycle is present on the inner side of the endodermis and: