Give reason for the following (a) Red algae are able to grow in deep sea. (b) During summer you cannnot notice the growth of funaria

During summer you cannot see the growth of Funaria. what is the reason of this?

Diborane is an important hydride of Boron a. During a class room discussion, a student argues that there is a covalent bond between boron atoms in diborane. What is your opinion. Give justification. b. Boron halides can act as Lewis acids. Give reason. c. Arrange the following Lewis acids in the increasing order of acidic strength. Substantiate your answer? 'BF_3 BCl_3, BBr_3'

Suppose during your field visit for collection from a rocky sea shore you have got some live specimens such as sea urchin, sea cucumber, sea anemone. Is it possible to keep them on an aquarium in your school. Give reasons for your answer.

Natural fibres and synthetic fibres are used in the field of textile manufacturing. Which of these clothes is most suited for the following situations? Give reason. i. While cooking in the kitchen ii. To wear during summer