Which of the following is a gymnosperm?

a) moss
b) monocot
c) horsetail
d) fern
e) cycad


Ans: e) cycad

Biology & Microbiology

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Which of the following areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes?

What will be an ideal response?

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Secretion occurs mainly in the:a

distal convoluted tubule. b. loop of Henle. c. proximal convoluted tubule. d. collecting duct. e. glomerulus.

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Which one of the following does not match a component of the amniotic egg with its primary function?

A. amnion-encloses embryo within an oxygen-filled cavity B. yolk sac-provides food for the embryo C. allantois-segregates nitrogenous wastes from embryo D. chorion-exchange of respiratory gases; retention of water E. shell-porous, protective covering

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Relative dating uses ___________ to estimate how old a fossil is.

A. Embryonic structures B. Radioactive structures C. A molecular clock D. Structural features E. Depth within rock layers

Biology & Microbiology