In which phase of the cell cycle does replication occur in Eukaryotes? What would happen if cell-division is not followed after DNA replication?

Explain Darwinian theory of evolution with the help of one suitable example. State the two key concept of the theory.

Study the graph given below and answer the questions that follow:

(i) Write the status of food and space in the curves (a) and (b).

(ii) In the absence of predators, which one of the two curves would appropriately depict the prey population?

(iii) Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line.

What is primary productivity? Why does it vary in different types of ecosystems?

State the relation between gross and net primary productivity.

Coconut palm is monoecious, while date palm is dioecious. Why are they so called?

Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.

How is 'oogenesis' markedly different from 'spermatogenesis' with respect to the growth till puberty in the humans?

Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.

40.

Mention any three characteristics of Neanderthal man that lived in near east and central Asia.