Limitations of electrical impulses and plant vs animal movements

Question 1

What are the limitations of electrical impulses in multicellular organisms?

Accepted Answer

1. Electrical impulses reach only those cells that are connected by nervous tissue, not all body cells. 2. Once an electrical impulse is generated and transmitted, a cell takes time to reset its mechanism before generating a new impulse, making transmission non-continuous.

Question 2

In a 'Touch-me-not' plant, movement is seen on touch. Compare it with that of animals.

Accepted Answer

- **'Touch-me-not' plant:** Uses electrical-chemical means to convey information; movement occurs by changing water amount in cells (turgor pressure change) causing swelling/shrinking; no specialized nervous or muscle tissue present. - **Animal movement:** Uses specialized nervous tissue for signal conduction and specialized muscle proteins (actin/myosin) that contract and change shape.

Question 3

Name the type of movement shown by the growth of pollen tube towards an ovule.

Accepted Answer

Chemotropism (or positive chemotropic movement).

Limitations of electrical impulses and plant vs animal movements

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