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Biology · 2025 · 5 marks
Sexual Reproduction in Flowering PlantsPost-fertilisation : Structures and Events5 marksApplylong answer
CBSE 2025 · Region 5 · Set 1 · Q33
(a) (i) Explain the structure of a typical monocotyledonous embryo of a flowering plant. (ii) How are multiple embryos formed in a citrus fruit? What…
(a)(i)
Explain the structure of a typical monocotyledonous embryo of a flowering plant.
(ii)
How are multiple embryos formed in a citrus fruit? What is the mechanism known as ?
OR
(b)(i)
Name and explain the structural organisation of the male sex accessory ducts in the human male reproductive system.
(ii)
Describe the role of gonadotropin FSH in the regulation of spermatogenesis.
Marking-scheme solution
(i)
Embryo of a monocotyledon seed has one cotyledon called scutellum, situated towards
one side (lateral) of the embryonal axis at its lower end, the embryonal axis has the radical and root cap, enclosed in an undifferentiated sheath coleorhiza, The portion of the embryonal axis above the level of attachment of scutellum is epicotyl, and a few leaf primordia enclosed in a hollow foliar structure the coleoptile
(ii)
• Some of the Nucellar cells surrounding the embryo sac start dividing, and protrude
into the embryo sac and develop into embryos.
• Apomixis/Polyembryony
(i)
Rete testis, The seminiferous tubules of the testis open into the Vasa efferentia
through rete testis
Vasa efferentia, leave the testis and open into epididymis located along the posterior
surface of each testis
Epididymis, the epididymis leads to Vas deferens
Vas deferens, this ascends to the abdomen and loops over the urinary bladder.
(ii)
FSH acts on Sertoli cells, stimulates secretion of some factors which help in the process
of spermiogenesis (which is a part of spermatogenesis).
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.