Many microbial pathogens enter the gut of humans along with food. What are the preventive barries to protect the body from such pathogens? What type of immunity do you observe in this case?

Many microbial pathogens enter the gut of humans along with food. Name the physiological barrier that oritects the body from such pathogens.

how does food move along the human gut ?What is this process called?

What do you call the area of a human ovum from where the sperm makes the entry ?

The Class X students of a secondary school in Krishinagar have been allotted a rectangular plot of land for their gardening activity. Sapling of Gulmohar are planted on the boundary at a distance of lm from each other. There is a triangular grassy lawn in the plot as shown in the Fig. The students are to sow seeds of flowering plants on the remaining area of the plot.:- Taking A as origin find the coordinates of the vertices of triangle .What will be the coordinates of the vertices of triangle PQR if C is the origin ? Also calculate the areas of the triangles in these cases. What do you observe ?

Take a clock and fix its minute hand at 12. Record the angle turned through by the minute hand from its original position and the time that has passed, in the following table : What do you observe about T and A ? Do they increase together ?

What is the basic principle of vaccination? How do vaccines prevent microbial infections? Name the organism from which hepatitis B vaccine is produced.