Q22 of 31 Page 1

The graph given below shows the distribution of biomes:


(a) What do the ‘X’ and ‘Y’ axis represent?


(b) Identify the ‘grassland’ and ‘coniferous forest’ biomes, from the above figure.


(c) Why is ‘F’ located at the given position in the graph?

(a) X axis represents mean annual precipitation (cm)


Y axis represents mean annual temperature (◦C)


(b) In the given figure, region B is ‘grassland’ and region E is ‘coniferous forest’.


(c) F region is the tundra region, where the mean annual temperature ranges from -12 to 20◦C and mean annual precipitation ranges from 10 - 125 cm. These are the optimum conditions in tundra biome.


More from this chapter

All 31 →
20

CryIAb is introduced in a plant to prevent infestation by corn borer.

(a) What is the resultant plant referred as?


(b) Summarize the action of the gene introduced

 21

(a) In pBR322, foreign DNA has to be introduced in tetR region. From the restriction enzymes given below, which one should be used and why:

Pvu I, EcoR I, BamH I


(b) Give reasons, why the other two enzymes cannot be used.

 23

A son persuades his father to replace his old mobile phone with the latest model launched in the market. He also shares the latest features it has and explains how it can be of a help to him in the modern technological world. Father is reluctant in buying a new one and tries to explain about its environmental impact. How do you think, the biologist father would try to convince his son? Justify the arguments of father and son both, by mentioning positive aspects of the behavior displayed by both of them in the situation concerned (three each).

 24

Given below is the diagram of a human ovum surrounded by a few sperms. Observe the diagram and answer the following questions:


(a) Compare the fate of sperms shown in the diagram.


(b) What is the role of zona pellucida in this process?


(c) Analyze the changes occurring in the ovum during the process.


(d) How is the entry of sperm into the ovum facilitated?


(e) Specify the region of female reproductive system where the event represented in the diagram takes place.