Question

A) Plants have no circulatory system? Then how cells manage intercellular transport? B. Is nucleolus covered by membrane? C. Fluid mosaic model proposed by Singe and Nicolson replaced Sandwich mod proposed by Danielli and Davson? Why?​

Answer 1

Question ;

1 Plants have no circulatory system?

2 Then how cells manage intercellular transport?

3  Is nucleolus covered by membrane?

4 Fluid mosaic model proposed by Singe and Nicolson replaced Sandwich mod proposed by Daniella and Davison? Why?​

Explanation:

1 = Plants do not have a circulatory system like that of animals for transportation of food and minerals within the body. They have specialized tissues which help them in intercellular transportation. Such tissues are complex in structure and are known as vascular tissues. They are xylem and phloem.

2 =

3 = The nucleolus is an organelle that lacks a membrane and it is present inside the nucleus of the cell. The nucleolus in the nucleus of eukaryotic cells is the distinct structure present.

4 =  It was replaced by sandwich model as Fluid Mosaic Model only describes the characteristics of cell membrane from upper view. It explains that proteins are like ice bergs floating on sea of lipids. But sandwich model gives detail explanation about the arrangement of lipids and proteins.

5 = Hope it Helps You

Answer 2

A) Plants manage intercellular transport through
1. Diffusion - small substance move
from high concentration to low
concentrations
2. Or substance move from one cell to
another through diffusion or
osmosis.
3. Flow of solvent molecules occurs
through osmosis.
B. Nucleolus is not covered by
membrane because
1. It is located inside the nucleus and
nucleus is covered by membrane .