NCERT Solution for Class 10 Science Chapter 7
Control and Coordination
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-122
Questions No-5
Design an experiment to demonstrate hydrotropism.
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NCERT Solution for Class 10 Science Chapter 7
Control and Coordination
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-122
Questions No-5
Take two small beakers and label them as A and B. Fill beaker A with water. Now make a cylindrical-shaped roll from a filter paper and keep it as a bridge between beaker A and beaker B, as shown in the figure. Attach few germinating seeds in the middle of the filter paper bridge. Now, cover the entire set-up with a transparent plastic container so that the moisture is retained.
Observation:
The roots of the germinating seeds will grow towards beaker A.This experiment demonstrates the phenomenon of hydrotropism
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Take two glass troughs A and B and fill each one of them two-thirds with soil. In trough A plant a tiny seedling. In trough B plant a similar seedling and place a clay pot inside the soil. Water the soil in trough A daily and uniformly. Do not water the soil in trough B but put some water in the clay pot. Leave both the troughs for a few days.
Now, dig up the seedlings carefully from both the troughs without damaging their roots. We will find that the root of seedling in trough A is straight. On the other hand, the root of seedling in trough B is found to be bent to the right side i.e., towards the clay pot containing water.
In trough A, the root of the seedling gets water from both sides. But in trough B, the roots get water oozing out from the clay pot which is kept on the right side. Therefore, the root of seedling in trough B grows and bends towards the source of water to the right side. This experiment shows that the root of a plant grows towards water. In other words, the root of a plant is hydrotropism.
Hydro’ means water. Hydrotropism means growth towards water.
Materials Required: Seed, A big container, Porous water pot, water and Sand.
Procedure:
• The tray should be big enough to accommodate the porous pot.
• Fill the tray with sand and insert some seeds in it.
• Make a pit in the sand and insert the porous pot in it.
• Fill the porous pot with water. • Leave the set up for about a week.
Observation:
After a week when seeds are taken out, it is observed that roots grow in the direction of the porous pot. This shows hydrotropic movement in roots.
To demonstrate hydrotropism in plants.
Procedure :
i. Plant a seedling in a vessel containing soil.
ii. Adjacent to the seedling put a porous pot containing water.
iii. Leave the set up for few days.
Observation :
iv. On examining the roots it is observed that the roots bend towards the source of
water and do not grow straight.
result :
It confirms that plant shows hydrotropism as the roots bend towards the porous pot of
water. As hydrotropism is a plant growth response in which the direction of growth is
determined by a stimulus of gradient in water concentration.
Following things are required for this experiment:
Seeds of bean, a deep tray, sand, a porous flower pot
Procedure:
(i) The tray should be big enough to accommodate the porous pot.
(ii) Fill the tray with sand and insert some seeds in it.
(iii) Make a pit in the sand and insert the porous pot in it.
(iv) Fill the porous pot with water.
(v) Leave the set up for about a week.
Observation: After a week when seeds are taken out, it is observed that roots grow in the direction of the porous pot. This shows hydrotropic movement in roots.
Hydrotropism is the growth or movement of a plant in response to water. To design an experiment to demonstrate hydrotropism, you can set up a simple investigation using plant seedlings. Here’s a step-by-step guide:
Materials:
1. Plant Seeds (e.g., mung beans or radish seeds)
2. Petri dishes or small pots
3. Potting soil
4. Watering can or spray bottle
5. Transparent plastic barrier or divider (to create a water gradient)
6. Light source
7. Ruler or measuring tape
8. Marker or labels
Procedure:
1. Seed Germination:
» Plant the seeds in separate pots or sections of a Petri dish filled with potting soil. Ensure uniform conditions for germination, including temperature, light, and moisture.
2. Setup of Water Gradient:
» Create a water gradient by placing a transparent plastic barrier or divider in the middle of the experimental setup. This will allow you to water only one side of the plants, creating a gradient of water availability.
3. Labeling:
» Label each section or pot with the type of seed and mark one side as the “Watered” side and the other side as the “Dry” side.
4. Watering:
» Water only one side of the setup, ensuring that the “Watered” side receives ample water, while the “Dry” side remains relatively dry. Be careful not to overwater or underwater; maintain consistent conditions except for water availability.
5. Light Exposure:
» Place the entire setup under a light source to ensure uniform light conditions for the seedlings.
6. Observation and Measurement:
» Regularly observe and measure the growth of the seedlings. Focus on the direction of root growth. Use a ruler or measuring tape to measure the length of the roots.
7. Recording Data:
» Record your observations in a notebook. Note any differences in root growth between the “Watered” side and the “Dry” side.
8. Analysis:
» Analyze the data to determine if there is a significant difference in root growth direction between the watered and dry sides. Look for evidence of hydrotropic responses in the roots.
Expected Results:
If hydrotropism is occurring, you should observe a directional growth of the roots toward the watered side of the setup. The roots will likely exhibit a curvature, demonstrating the plant’s ability to sense and respond to water availability.
This experiment allows you to investigate how plants adjust their root growth in response to water gradients, providing evidence of hydrotropism.