Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Give a chart of partial pressure of oxygen and carbon dioxide at different places in the respiratory system:

How does a gap junction facilitate intercellular communication?

What do the terms phycobiont and mycobiont signify?

How does temperature and pH affect activity of enzyme?

Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or a dicot stem? Give reasons.

How do angiosperms support pollinators to carry out pollination in contrast to gymnosperms?

In Opuntia the stem is modified into a flattened green structure to perform the function of leaves (i.e., photosynthesis). Cite two other examples of modifications of plant parts for the purpose of photosynthesis.

What is the difference and similarity between prop root and stilt root?

All vertebrates possess:

1. Renal portal system.
2. Dorsal, hollow central nervous system.
3. Four chambered ventral heart.
4. Pharyngeal gill slits.

Differentiate between fibrous joints and cartilaginous joints with an example of each.