Question

Assertion :In some species of asteraceae and poaceae seeds are formed without fertilization. Reason: Formation of fruit without fertilization is called parthenocarpy.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Both Assertion and Reason are incorrect.

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

• Formation of seeds without fertilization is called as apomixis. It leads to clonal reproduction in which all offsprings are by and large genetically identical to the parent.
• The egg contains a full complement of genes and does not need to fuse with a sperm to produce a zygote.
• Apomixis provides for the perpetuation of traits favorable to individuals' survival but eliminates the longer-term evolutionary advantage of biparental inheritance.
• In Asteraceae, various genera and individual species of the order asterales are known to reproduce by apomixis (the setting of seeds without fertilization), either completely or in addition to normal sexual means.
• In Poaceae, about 35 genera produce seeds without fertilization. On the other hand, parthenocarpy is the development of fruits without fertilization. The fruit resembles a normally produced fruit but is seedless, e.g., pineapple, banana, cucumber, grape, orange, grapefruit, etc.
• So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'