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  4. An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the fiinicle is

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Q. An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the fiinicle is

AIPMTAIPMT 2004Sexual Reproduction in Flowering Plants

Solution:

In hemianatropous or hemitropous ovule, the nucellus and integuments are at right angles to stalk or funiculus so that the ovule becomes curved. It is commonly found is primulaceae and Ranunculus. In campylotropous ovule the body of the ovule gets curved and micropyle is directed downwards. Atropous ovule is erect and micropyle, chalaza and funiculus are in the same straight line. Anatropous ovule is the most common type of ovule in angiosperms. In this the body of the ovule gets inverted and the micropyle is on lower side.