Our Environment — Science STD 10 — Question

“Respiration is a vital function of the body”. Justify this statement.

Mention the events taking place when the ovum is fertilized in fallopian tube till it is implanted in the uterus of human female.

An electric iron of resistance 20 Ω takes a current of 5A. Calculate the heat developed in 30 s.

What changes are observed in the uterus if fertilisation does not occur?

In which type of combination of different resistors will have equal value of electric current through them?

“Nervous and hormonal systems together perform the function of control and coordination in human beings.” Justify the statement.

How can we prevent floods?

A plant has two varieties, one with red petals and the other with white petals. When these two varieties are cross-pollinated, all the offsprings have red petals?

1. Which gene is dominant?
2. Choose suitable letters to represent the two genes.

Describe one reaction of a carboxylic acid.

Explain why, the noble gases are placed in a separate group.