Biology MCQs

Notes:
Estrogen and progesterone are the female sex harmones. Estrogen is responsible for the development of secondary sexual characteristics. Progesterone supports during pregnancy and controls the menstrual cycles in women.

Notes:
The scientific name of sea fan is Alcyonacea. Alcyonacea are an order of corals that do not produce calcium carbonate skeltons. They are found throughout the oceans of the world.

Notes:
The Human Immunodeficiency Virus (HIV) are two species of lentivirus. It causes life-threatening disease of AIDS in humans and infects them. HIV is a sexually transmitted infection and occurs by contact with or transfer of blood, pre-ejaculate, semen, and vaginal fluids.

Notes:
The transmission of characteristics from parent to offspring is called heredity, and can be inferred from inherited characteristics.

Notes:
Cell differentiation is the process by which dividing cells change their functional or phenotypic type. All cells probably derive from stem cells and acquire their functions when they mature. Walther Flemming discovered cell differentiation.

Notes:
Pertussis is a respiratory disease commonly known as whooping cough. It is a very contagious disease caused by a type of bacteria called Bordetella pertussis.

Notes:
Chlorophyll ‘a’ is an essential pigment, it is not helpful.

Notes:
Heteromorphic alternation of generation is commonly found in Bryophyta. Bryophytes are small, non-vascular plants, examples of mosses, liverworts, and hornworts.

Notes:
Carbon dioxide, Oxygen, and Water vapor are released by the leaves of a plant. Plants absorb nitrogen from the soil in a form of nitrate and ammonium.

Notes:
Pathogens reduce the number of products and also affect the yield of the crop by reducing the quality of crop production. The cost of production of pathogens also increases due to low yield and expenditure on pesticides.