Question

Activity 6.1 class 9th.Please tell the length of roots of onion bulbs in 1st second 3rd and 4th day if they are put in a jar of water.

Answer 1

Answer: here is your answer

jar 1

1st day = 1cm

2nd day = 4cm

3rd day = 8cm

4th day = 11cm

jar 2

1st day = 1cm

2nd day =3.5 cm

3rd day = 2.5 cm

4th day = 2.5 cm

Answer 2

Observation: Removal of the root pointer halts the root development.

Explanation: development in plants arises in particular areas.

• These areas are known as apical, lateral and intercalary. These areas comprise fast-dividing cell organizations named meristematic tissues. When cutting the onion root pointer, the apical meristem tissues are trim.
• The apical meristem is the central dividing tissue in the root and shoot which improves the size. As an outcome, the development of roots is ended in these roots.

Inference: Here the root accumulates only at the tip. It demonstrates that a portion of a plant accumulates only in particular areas.

• If observing all portions of a plant see, that the root tip affects root extension, the shoot tip affects shoot elongation, the sideways sides of the stem and the root improvement the consistency of the root and stem.
• Furthermore, the lateral walls of the leaf develop and bring about the leaf large.

Note: Onion roots are fast-dividing cells. Analysis of mitosis from these dividing cells.

length provided in the table is in the unit of centimetres

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