Question

E. HIGHER ORDER THINKING SKILLS HOTS
1. Cell wall helps the plant to keep its aerial parts upright. Justify,
2. How do CO, and water move in and out of cell ?
3. Cell wall protects the cell against getting burst. How?
4. Mitochondrion is a semi autonomous body. Why?
5. How does starvation lead to autophagy in a cell?

Its urgent please please solve this answer.......​

Answer 1

Answer:

1. The cell wall is a protective layer around the plant cell. It mostly consists of cellulose, which provides rigidity and strength to the plant cell,helping it to stand upright. ... When the central vacuole is full, it creates pressure that helps keep the plant cell rigid and firm.
2. The substances like CO2 and water move in and out of a cell by diffusion from the region of high concentration to low concentration. When the concentration of CO2 and water is higher in external environment than that inside the cell, CO2 and water moves inside the cell.
3. The cell walls of plant cells help them maintain turgor pressure, which is the pressure of the cell membrane pressing against the cell wall. The cell wall efficiently holds water in so that the cell does not burst.
4. Mitochondria is a semi autonomous body as it contains its own DNA and nucleus. The inner membrane of mitochondria will also contain ribosomes which is why it can synthesize its own protiens.
5. Starvation and Autophagy. Starvation stimulates withdrawal from the cell cycle, as well as stimulating autophagy. ... show a direct and nutrient-sensitive interaction between the tumor suppressor p53 and the essential autophagy gene Atg7.

Answer 2

Answer:

1)It mostly consists of cellulose, which provides rigidity and strength to the plant cell,helping it to stand upright. ... When the central vacuole is full, it creates pressure that helps keep the plant cell rigid and firm

2)Water passes through the membrane in a diffusion process called osmosis. During active transport, energy is expended to assist material movement across the membrane in a direction against their concentration gradient.

The substances like CO2 and water move in and out of a cell by diffusion from the region of high concentration to low concentration. When the concentration of CO2 and water is higher in external environment than that inside the cell, CO2 and water moves inside the cell

3)The structure of the lipid bilayer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.