Give scientific reasons:
In plants like Touch-me-not (Mimosa), movement also occurs at the places other than where it has been touched.

Give scientific reason: Darwin's work on evolution has been a milestone.

Give scientific reasons for the following: Dust and other small particles are attached by a plastic comb which has been moved vigorously through dry hair.

Give scientific reason. Left ventricle is thick than all other chambers of heart.

Give reason HF has higher boiling point than other halogen acid

Give scientific reasons for the following: The diverged leaves of a positively charged gold leaf electroscope collapse if its disc is touched with a charge ebonite rod.

Give reasons : While pulling a bucket from a well , the bucket full of water immersed fully in water appears to weigh less than when it has been pulled out of water . Why ?

A glass of water has an ice cube floating in water. The water level just touches the rim of the glass. Will the water overflow when the ice melts ? Give the reason.

Read the following paragraph and answer the questions based on it. Rhizobium living in root nodules supply nitrates, nitrites and amino acids to that plant and in exchange get energy in the form of carbohydrates from it. Such a mutually beneficial relationship is called symbiosis. Rhizobium produce nitrogenous compounds from atmospheric nitrogen. However, for this process of nitrogen fixation, they need leguminous plants like beans, sweet pea, soyabean, etc. as ‘host’. Beans and pulses are rich in proteins due to the nitrogenous compounds made available by Rhizobium. After harvesting a leguminous crop, the left-over roots and other plant parts are deliberately dumped in farm soil to maintain its bacterial population. The use of Rhizobium has helped to reduce the use of chemical fertilizers and thereby their adverse effects. It has also helped to reduce expenses on fertilizers and thus works to the benefit of farmers. Why does left over roots and other plant parts are deliberately dumped in farm soil after harvesting a leguminous crop?