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Biology · 2026 · 5 marks
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and Events5 marksApplylong answer
CBSE 2026 · Region 4 · Set 2 · Q32
(a) Study the flow chart given below. Name the hormones involved at each stage and explain their functions.
Study the flow chart given below. Name the hormones involved at each stage and explain their functions.
(i)
Draw a diagram of L.S. of maize grain and label its any six parts.
(ii)
Differentiate between perisperm and endosperm giving one example of each.
Marking-scheme solution
Gonadotropin releasing hormone/ GnRH , It stimulates the pituitary gland to
release follicle stimulating hormone or FSH and Luteinising hormone or LH both act on ovary.
FSH/ Follicle stimulating hormone , stimulate follicular development and
secretion of estrogen by the follicle cells.
LH/ Luteinising hormone , stimulates ovulation/ formation of corpus luteum from
the ruptured graafian follicle.
Progesterone , Maintenance of endometrium necessary for implantation and other
events of pregnancy.
Estrogen , responsible for the maturation of primary follicle into graafian follicle/
regeneration of endometrium lining.
(i)
(b)
(ii)
| Perisperm | Endosperm |
| In seeds residual persistent nucellus is called perisperm. | It is the product formed from the primary endosperm cell in the ovule. |
| The cells are diploid (2n) | Cells are triploid (3n) |
• Examples :
| Perisperm | Endosperm |
| Eg. Black pepper / beet | Eg. Castor / Wheat / Maize / Barley / Sunflower / Coconut |
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.