Question

Select the incorrect statement from the following.

1. Galactans and mannans are found in the cell wall of algae

2. Cell wall protects the cell from mechanical damage

3. Plants never contain proteins in their cell wall

4. Primary cell wall of young plant cell is capable of growth​

Answer 1

Answer: 3rd options is incorrect as it is clearly mentioned in ncert that plant cell wall contains cellulose,hemicellulose,pectin and proteins.

its a fact based question.

Explanation: please ,humble request,mark as brainliest and fllow if you like.thankyou.

Answer 2

The answer to the given question will be '3. Plants never contain proteins in their cell wall'.

1. 'Galactans and mannans are found in the cell wall of algae' is a correct statement as the algae consists of cellulose, galctans and mannans.

2. 'Cell wall protects the cell from mechanical damage' is a correct statement as  one of the primary function of a cell wall is to protect the cell from mechanical damage.

3. 'Plants never contain proteins in their cell wall' is an incorrect statement as The cell wall of plants contain small amounts of protein.

4. 'Primary cell wall of young plant cell is capable of growth​' is a correct statement as the primary cell wall of the young plant cell is capable of growth but, it decreases on maturity.

• Thus, the incorrect statement will be '3. Plants never contain proteins in their cell wall'.