Problem 4 - Biology: The Dynamic Science

Question

Which of the following processes contributes to the uptake of mineral ions by plant roots? a. chlorosis b. osmosis c. anion exchange d. cation exchange e. growth of root hairs

Step-by-Step Solution

Answer

Anion exchange and cation exchange, that is, options c and d are the processes that contribute to the uptake of mineral ions by plant roots.

Step 1: Understanding Chlorosis

Chlorosis is a condition in plants where there is insufficient production of chlorophyll resulting in yellow or pale green leaves. This doesn't contribute to the uptake of mineral ions by plant roots.

Step 2: Understanding Osmosis

Osmosis is the process by which water molecules pass across a semi-permeable membrane from a less concentrated solution to a more concentrated one. While it contributes to water uptake, it doesn't directly contribute to mineral ion uptake.

Step 3: Understanding Anion exchange

Anion exchange is a process where anions (negative ions) in a solution are exchanged with other anions. It plays a significant role in uptake of mineral ions as it allows for the interaction of negatively charged ions with soil particles and plant roots.

Step 4: Understanding Cation exchange

Cation exchange is a process where cations (positive ions) in a solution are exchanged with other cations. It is significant in the uptake of mineral ions - positively charged ions like potassium, calcium and magnesium interact with negatively charged soil particles.

Step 5: Understanding Growth of Root Hairs

Growth of root hairs is about the expansion of roots to increase the surface area for absorption. However, it does not directly contribute to the process of mineral ion uptake though it aids the process by providing more surface area for absorption of water and nutrients.