Write a note on Von Helmont's experiment focusing on how he concluded that water was important for growth in plant body mass?

What did Priestly hypothesize on the experiment he conducted on the role of air in the growth of plants ?

Assertion (A): some abiotic factors like air, water, light and heat are very important for growth are plants. Reason (R): some of the above abiotic factors are important for all living organisms

A student was given the following substances and was asked to show types of chemical reactions through experiment. Write how he would have done that. Copper sulphate solution, barium chloride solution, ferrous sulphate crystals, Iron nails, calcium oxide, water.

How does most of the water move within a healthy plant body and by which path ?

Do you agree with Von Helmont? If nutrients absorbed by plants from soil is equal to the mass of plant/tree what will happen? Think and write your hypothesis.

Take a glass jar and fill with soil. Show a bean seed near the wall of the jar. After 4 - 5 days you will notice seed germination. Keep the jar under the sun. Observe how root and shoot grows. Then tilt the glass jar and keep the plant horizontally. Observe the direction of the root and shoot growth for more than a week vi) What did they observe by that experiment?

Take a glass jar and fill with soil. Show a bean seed near the wall of the jar. After 4 - 5 days you will notice seed germination. Keep the jar under the sun. Observe how root and shoot grows. Then tilt the glass jar and keep the plant horizontally. Observe the direction of the root and shoot growth for more than a week iv) Who performed experiments on phototropism?

Write a short note on (a) Adaptations of desert plants and animals (b) Adaptations of plants to water scarcity (c) Behavioural adaptations in animals (d) Importance of light to plants (e) Effect of temperature or water scarcity and the adaptations of animals.