Q4. How many thecae and how many microsporangia are there in a flower with 7 stamens, each with a typical angiosperm anther?
A typical anther is bilobed and dithecous: each lobe is one theca with two microsporangia, so one anther has 2 thecae and 4 microsporangia (NCERT pages 5 and 23; NCERT’s wording “two theca” in each lobe is a slip, explained on the pre-fertilisation page). The flower has 7 × 2 = 14 thecae and 7 × 4 = 28 microsporangia.
Q5. Assertion: the egg cell of a flowering plant is formed inside the ovule. Reason: the embryo sac, the female gametophyte, is located in the nucellus of the ovule. Are both true, and does the reason explain the assertion?
Both are true, and the reason explains the assertion: the egg cell is part of the egg apparatus of the embryo sac, which lies in the nucellus (NCERT pages 9 and 11).
Q6. NCERT asks “Have you heard of floriculture – what does it refer to?” (page 4). Answer it.
The chapter does not define the word, but its parts explain it (our own reading): flori-, flower, and culture, cultivation. Floriculture includes cultivation of flowers and other ornamental plants, including the garden and celebration flowers NCERT asks you to list (ICAR, Floriculture and Landscaping syllabus).