Plant Water Relation — BIOLOGY STD 12 Science — Question

Hungary, United States, Denmark, Italy, Australia, Kenya, Nigeria, Germany

Pattern of population growth	Name of the countries
(1) Rapid growth	————–
(2) Slow growth	—————
(3) Zero growth	————–
(4) Negative growth	————–

Is it possible that productivity and diversity of a natural community remain constant over a time period of, say one hundred years?

Give reasons : Expiration is called a passive process.

Arithmetic growth and Geometric growth

What is EBG? What information can be obtained from the EEG?

Name the germinal layers from which the following organs develop. Tongue, Heart, Sweat gland, vagina. Mammary gland, Kidney

The outline structure of a drug is given below,

1. Which group of drugs does this represent?
2. What are the modes of consumption of these drugs?
3. Name the organ of the body which is affected by consumption of these drugs.

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Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process.

Give the applications of PCR technique.

Two types of aquatic organisms in a lake show specific growth patterns as shown below, in brief period of time. The lake is adjacent to an agricultural land extensively supplied with fertilisers.

Answer the questions based on the facts given above:

1. Name the organisms depicting the patterns A and B.
2. State the reason for the growth pattern seen in
3. Write the effects of the growth patterns seen above.