Understanding EcoSystems — BIOLOGY STD 9 — Question

How is plant hybridisation carried out?

Draw labelled diagrams showing the structure of the following seeds:

Name the three kinds of muscles found in the human body. In each case, name one region in the body where they are found.

Explain, how do living organisms interact in an ecosystem.

What are the different types of joints? Give one example of each type.

Match the words of column A with the appropriate words of column B:

Column A	Column B
(a) Adipose tissue	(i) Cyton
(b) Neuron	(ii) Unstriated muscles
(c) The dark and light band	(iii) Columnar epithelium
(d) Dermis of skin	(iv) Striated muscles
(e) Sieve pits	(v) Fat cells
(f) Br ick like	(vi) Phloem

A farmer and a housewife may have never studied biology, yet both of them know some of its general principles through experience. State any two principles which they know.

Write short notes on: Economic importance of yeast

Match the items in column A with appropriate items in column B:

Column A	Column B
Physiology	Tissues
Microbiology	Life-cycle
Embryology	Insects
Entomology	Cells
Cytology	Microbes
Histology	Vital activities

Complete the following paragrath
(plasma, antigenic, bacterial or viral or antigenic, antigen , animal or human, antigen, bacteria or virus, antibodies, blood)Serums contain (i) ............. substance of a particular (ii) ............. and they are used as preventive measure against (iii) ............. invasions. To prepare serum, a small quantity of bacterial (iv) ............. is injected into a healthy (v) ............. . The animal body produces (vi) ............. to neutralise the effect of toxin. This process is repeated for several rounds and (vii) ............. of such animal is taken out and on chilling, it clears as straw colour liquid (viii) ............. . Snake bites are treated by producing anti-venom from the blood of (ix) ............. .