Which one of the following structures between two adjacent cells is an effective transport pathway?

1. Plasmodesmata

2. Plastoquinones

3. Endoplasmic reticulum

4. Plasmalemma

Alage have cell wall made up of:
1. Cellulose, galactans and mannans
2. Hemicellulose, pectins and proteins
3. Pectins, cellulose and proteins
4. Cellulose, hemicellulose and pectins

Middle lamella is mainly composed of:

1. hemicellulose 

2. muramic acid

3. calcium pectate

4. phosphoglycerides

Plasmodesmata are:
 

Element necessary for the middle lamella:
1.  Ca
2.  Zn
3.  K
4.  Cu