Biomolecules — BIOLOGY STD 11 Science — Question

What is the body organisation in members of Kingdom-Animalia?

Whose hypothesis revealed that plant purifies air while breathing animals and burning candles fouls it?

What is called respiratory surface?

Name the sphincter present in a form of muscular ring in digestive tract that regulates the opening of oesophagus into stomach.

Mention the possible location in the chloroplast, where cyclic flow of electrons (cyclic photophosphorylation) occurs.

How many ovule(s) is/ are seen in the ovary of sunflower?

Why are mesosomes present in bacterial cell, known to be equivalent to mitochondrion in eukaryotic cell.

What is the importance of pneumatic bones and air sacs in Aves?

Explain in 2-3 lines the following terms with the help of examples taken from different plant tissues. De-differentiation.

Which system indicates evolutionary as well as genetic relationships among organisms.