In which of the following tissue the cells are much thickened at the corners due to deposition of cellulose, hemicellulose, and pectin?
1. Parenchyma
2. Collenchyma
3. Sclerenchyma
4. Prosenchyma

When protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery of the organ, the primary xylem is called 

Starch sheath is found in :-

Which of the following has unevenly thick cell wall, has a primary wall (cellulose) and a secondary wall (hemicellulose or pectin), and is a simple, living, primarily mechanical tissue of the plant body?
1. Parenchyma
2. Collenchyma
3. Sclerenchyma
4. Aerenchyma

The gritty texture of pears is caused by

Elongated or tube-like cells with thick and lignified walls and tapering ends is
1. Tracheids
2. Vessel
3. Sieve tube
4. Collenchyma

During the formation of leaves and elongation of the stem, some cells "left behind" from the shoot apical meristem, constitute

1. Lateral meristem

2. Axillary bud

3. Cork cambium

4. Fascicular cambium

Lignin is most likely to be found in the secondary walls of:
1. Parenchyma
2. Collenchyma
3. Sclerenchyma
4. Epidermis

The size of the vascular bundles are dependent on the size of the
1.veins
2.air cavities
3.chloroplast
4.All of the above

Midrib and veins of the leaf represents
1.vascular bundle
2. cortex
3.palisade parenchyma
4.spongy parenchyma