Intracytoplasmic sperm injection is used by couples in which
A. the female has blocked oviducts.
B. the female has very irregular ovulation.
C. the female is approaching menopause.
D. the source of sperm is a sperm bank.
E. the male is infertile.
E
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Why do peanuts grow underground? Because they
a. are a product of the root. b. are a product of the stem, which bends to the soil surface. c. are a product of the flower, which bends to bury itself in the soil. d. bud off the tuber, like the eyes of a potato. e. are a part of the seed that never grows above the soil.
Independent assortment refers to the fact that
A. a cell will divide and produce various offspring regardless of whether any other cell is dividing. B. mitosis normally produces cells that are like each other and like the parent cell. C. the daughter cell that receives the maternal #1 chromosome will not necessarily receive the maternal #2. D. a crossover between two chromosomes will produce offspring unlike either parent.
Which statement about fungi and plant disease is most accurate?
A) About equal numbers of plant diseases are caused by fungi and bacteria. B) Far more plant diseases are caused by fungi than bacteria. C) Viruses cause more plant diseases than fungi. D) Fungi rarely cause diseases.
In the food chain below, which population will most likely decrease if snakes are removed from the food chain? grass- > grasshopper -> frog -> snake -> hawk
A. grass B. grasshopper C. frog D. hawk