CBSE 2025 · Region 4 · Set 3 · Q21 · 2 marks
(i)Write the function of each of the following :(I)Seminal Plasma(II)Acrosome of human sperm(ii)Differentiate between menarche and menopause.(i)How is apomixis different from parthenocarpy ?(ii)Why are apples and cashews not called true fruits ?
(i)
Write the function of each of the following :
(I)
Seminal Plasma
(II)
Acrosome of human sperm
(ii)
Differentiate between menarche and menopause.
(i)
How is apomixis different from parthenocarpy ?
(ii)
Why are apples and cashews not called true fruits ?
Marking-scheme solution
(i)
(I)
Seminal plasma provides nutrition as it is rich in fructose
calcium and certain enzymes, provides transportation medium for sperm, helps in maintaining pH of the semen, helps in maturation and motility of sperms, helps in lubrication of penis, or any other correct point
$\displaystyle 90$ Zooplanktons
$\displaystyle 40$ Phytoplanktons
$\displaystyle 120$ Fishes
Increasing biomass
Trophic level
Secondary consumers /SC
Primary consumers / PC
Primary producers / PP
(II)
Acrosome is filled with enzymes which help to fertilize
ovum/The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum
(ii)
Menarche
Menopause
Is the beginning of the
first menstrual cycle
It marks the end of the
menstrual cycle
Starts at puberty
Ceases/stops
around
the age of $\displaystyle 50$ years
(i)
Apomixis is production of seeds without fertilisation whereas parthenocarpy is formation of fruits without fertilisation.
(ii)
Floral parts other than the ovary also contribute to form fruit in cashew and apple so they are not called as true fruits/ in apple and cashew the thalamus also contributes to fruit formation.
Human ReproductionGametogenesisUnderstandvery_short_answermedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.