Dominant character masks the ______________ characters.
______________ artery takes the blood to the lungs for oxygenation.
Roots of plants grow towards light
Hormones secreted by endocrine glands are directly released into blood stream.
If X chromosome is inherited from mother and Y from father, the offspring will be male.
Write structural formula of Methane.
Name the following:
Metals which forms an amphoteric oxide.
‘A’ is an element having four electrons in its outermost orbit. An allotropes ‘B’ of this element is used as a dry lubricant in machinery and in pencil leads. So:
i. Write the name of element ‘A’ and its allotropes.
ii. State whether ‘B’ is a good conductor or non-conductor of electricity?
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so:
i. What is the nature of oxide E2O ?
ii. Write the name of element ‘E’.
Write two points of differences between arteries and veins.
Write any three differences between metals and non-metals with respect to their physical properties.
Define Saturated hydrocarbon.
Define Unsaturated hydrocarbon.
Write the names and functions of three parts of human nervous system in which it is divided.
What is meant by sexual reproduction?
Name two main processes of sexual reproduction
Name any three parts of te female reproductive system in human beings. Write one function of each.
Write names of different parts of human digestive system and explain functions of any three parts.