Chemical Coordination and integration — BIOLOGY STD 11 Science — Question

A student cultures a callus from the tobacco pith in a sterilised minimal nutritive medium, but adds more cytokinins than auxins. What would develop first from the callus the shoot buds or the roots?

Both anabolic and catabolic agents take part in the respiratory tract, what is it called?

Write name of some common protein found in human food.

What is meant by (a) early bark and (b) late bark?

Define living state.

Mark the odd one in the following groups.
Anabaena, Spirogyra, Nostoc, Rhizobium.

How many chambers does the heart of a frog have?

Give an example of an artificial auxin.

What is phragmoplast? Explain its importance.

Name the stage of cell cycle at which one of the following events occur:
(1) Chromosomes are moved to spindle equator
(ii) Centromere splits and chromatids separate.
(iii) Pairing between homologous chromosomes takes place.
(iv) Crossing over between homologous chromosomes takes place.