4.1 State the pattern of distribution of the growth hormone at:

Question

ScanSolve AI Tutor · Accepted Answer

Here are the answers to your questions: 2.4.1 State the pattern of distribution of the growth hormone at: a) A: Evenly distributed (across the width of the shoot). b) B: Evenly distributed (across the width of the root). 2.4.2 Explain ONE reason why the disc was kept in a dark room. To eliminate light as an external stimulus (phototropism), ensuring that any observed growth response is due to gravity (gravitropism) only. 2.4.3 Draw a neat diagram to show the direction of growth of the young shoot and root in DIAGRAM 2, after a week. The diagram should show the seedling in the horizontal position as in DIAGRAM 2. The young shoot (A) should be drawn bending and growing upwards (against gravity). The young root (B) should be drawn bending and growing downwards (with gravity). 2.4.4 Explain the direction of growth of the young root after it was placed in the position shown in DIAGRAM 2. Step 1: When the root is placed horizontally, gravity causes growth hormones (auxins) to accumulate on the lower side of the root. Step 2: In roots, high concentrations of auxins inhibit cell elongation. Step 3: Consequently, the cells on the lower side of the root elongate less than the cells on the upper side. Step 4: This differential growth causes the root to bend downwards, exhibiting positive gravitropism.

4.1 State the pattern of distribution of the growth hormone at:

Step-by-step solution

Part a

Part b· 4 steps

When the root is placed horizontally, gravity causes growth hormones (auxins) to accumulate on the lower side of the root.

In roots, high concentrations of auxins inhibit cell elongation.

Consequently, the cells on the lower side of the root elongate less than the cells on the upper side.

This differential growth causes the root to bend downwards, exhibiting positive gravitropism.

Still stuck on this one?

More Biology Questions