PART - 2 - Unit V : CH - 19 Chemical Coordination and Integration — BIOLOGY STD 11 Science — Question

We find that Rhizobium forms nodules on the roots of leguminous plants. Also Frankia another microbe forms nitrogen fixing nodules on the roots of non-leguminous plant Alnus.

1. Can we artificially induce the property of nitrogen fixation in a plant – leguminous or non-leguminous?
2. What kind of relationship is observed between mycorrhiza and pine trees?
3. Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of one example.

Some varieties of wheat are known as spring wheat while others are called winter wheat. Former variety is sown, and planted in spring and is harvested by the end of the same season. However, winter varieties, if planted in spring, fail to flower or produce mature grains within a span of a flowering season. Explain, why?

Which hormones are secreted from the posterior pituitary gland? Explain each one's function in detail.

Mention any three similarities and two differences between facilitated diffusion and active transport of substances in plants. Also draw a neat labelled diagram depicting facilitated diffusion of proteins.

Match the following

	Column I		Column II
a.	Chlamydomonas	i.	Moss
b.	Cycas	ii.	Pteridophyte
c.	Selaginella	iii.	Algae
d.	Sphagnum	iv.	Gymnosperm

Describe the alimentary canal of frog by drawing a labelled diagram.

Eukaryotic cells have organelles which may
i. not be bound by a membrane
ii. bound by a single membrane
iii. bound by a double membrane
Group the various sub-cellular organelles into these three categories.

Explain how minerals are transported to various parts of plants?

Explain the process of digestion in the buccal cavity with a note on the arrangement of teeth.

Both bryophytes and pteridophytes require water for fertilisation; yet they differ from each other in many aspects. Bring out any two differences between them.