Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

When oxygen in the atmosphere decreases by 50%, how will respiration in plants be affected?

How many sodium ions go out and how many potassium ions enter the cell per cycle through the sodium potassium pump?

What are the cells that make the leaves curl in plants during water stress?

How does ethylene help plants to absorb more water and minerals?

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

Mark the odd one in the following groups. Inspiratory capacity, residual volume, expiratory capacity, vital capacity.

List the hormones secreted by the following: Kidney.

Name of any one living fossil of Arthropoda phylum.

How many contractions does the Sinoatrial Node (SAN) generate in one minute?

We commonly call ATP as the energy currency of the cell, why? Can you think of some other energy carriers present in a cell? Give name any two.