Plant Water Relation — BIOLOGY STD 12 Science — Question

What is the effect of UV-B radiation on body?

Humans benefit from diversity of life. Give two examples.

Eosinophils and Basophils.

Explain the causes of global warming. Why is it warning to mankind?

Name the hormone secreted by the heart. What is its function?

During a medical investigation, an infant was found to possess an extra chromosome 21. Describe the symptoms the child is likely to develop later in the life.

Give scientific : A drunken person cannot maintain balance of the body.

Community Service department of your school plans a visit to a slum area near the school with an objective to educate the slum dwellers with respect to health and hygiene.

1. Why is there a need to organize such visits?
2. Write the steps you will highlight, as a member of this department, in your interaction with them to enable them to lead a healthy life.

In the following table of interspecific interactions, fill the blanks with (+) sign for beneficient interaction, (-) sign for detrimental and 0 for neutral interaction.

Species A	Species B	Name of Interaction
+		Mutualism
	-	Competition
	-	Predation
+		Parasitism
+		Commensalism
	0	Amensalism

Describe physiological effects and applications of gaseous hormones in plants.