Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Define a climax community. How does a sere differ from a seral community?

Whose theory was put to test by Miller and Urey and what was the theory? How did their experiment give due to abiotic origin of life on earth?

Following the collision of two trains, a large number of passengers are killed. A majority of them are beyond recognition. Authorities want to hand over the dead to their relatives. Name a modem scientific method and write the procedure that would help in the identification of kinship.

What is co-extinction? Explain with a suitable example?

Give reasons, why?

1. Cow dung is preferred for biogas production.
2. Saccharomyces cerevisiae is commonly known as baker's yeast.

'in-situ' conservation can help endangered/threatened species. Justify the statement.

From where the fossils of Neanderthal man were found? Also write its characteristics.###Write two characteristics of the mental capacity and lifestyle of Neanderthal humans.

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

Study the graph given below and answer the questions that follows.

1. Write the status of food and space in the curves A and B.
2. In the absence of predators, which one of the two curves would appropriately depict the prey population?
3. Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line.