Taking the example of Peppered moth, explain the action of natural selection. What do you call the above phenomenon ?

Under threat or attack, garden lizard loses a part of its tail which trembles and avert the attention of predators, so that the lizard escape later the tail regrown for lizard. The same phenomenon can also be noticed in organisms like starfish etc. What do you call this phenomenon? Define it.

Briefly explain the need of constant internal environment for organisms. What do you mean by homeostasis ?

In the animal world, some organisms have both male and female repro-ductive organs. a. What do you call such organisms? b. Give two examples.

Protophloem is the first formed phloem. If the protophloem surrounds by xylem, what kind of arrangement of phloem would you call it. Give example .

Justify that the line bar(AB) line segment formed by points given in the above three examples is parallel to Y-axis. What can you say about their slope? Why? i) A(-4,2) , B(-4,-2)

The glomerulus of the nephron filtered the blood, and it is called glomerular filtrate. While it is passed through the different segments of nephron, certain substances are selectively reabsorbed. What are the substance reabsorbed and in which segment. Explain.

Harish observed two different types of papaya plants in his garden. One produced male flowers only and the other type produced female flowers as well as fruits. a. What are these type of plants called in which male and female flowers seen separately? b. Name another plant with the same feature. c. If both male and female flowers are seen separately in the same plant, what do you call them? Give examples.

a. Which law is demonstrated in the above figures? b. State the law. c. Explain the action that takes place in the above figures.