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In the following question, a statement of assertion (A) is followed by a statement of reason (R)
A : Main body of an ovule is called nucellus.
R: The nucellus is well developed in polypetalae.
If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
If Assertion is a true statement but Reason is false, then mark (3).
If both Assertion and Reason are false statements, then mark (4).
Answers (1)
Statement A: Main body of an ovule is called nucellus.
This statement is correct. The nucellus refers to the main body of an ovule, which is a part of the female reproductive structure of a plant. The nucellus contains the embryo sac, which houses the female gametes (egg cells) and is surrounded by integuments that form the outer layers of the ovule.
"The nucellus is well developed in Polypetalae" is correct. Polypetalae, also known as the subclass Polypetalae or Eudicotyledons, refers to a group of flowering plants that have separate petals. These plants typically exhibit a well-developed nucellus within their ovules.
The nucellus is an essential part of the ovule, serving as the nutritive tissue that supports the development of the embryo. It surrounds the embryo sac, which contains the female gametes (egg cells) and is enclosed within the integuments.
Therefore, statement R is accurate, indicating that the nucellus is indeed well developed in Polypetalae, a subclass of flowering plants but it is not a correct explanation of the above statement. Hence, the correct answer is option 2.
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