✓ Board-verified
Science · 2024 · 5 marks
CBSE 2024 · Region 3 · Set 3 · Q35
(a) Name any two sexually transmitted diseases. (b) Prenatal sex determination is prohibited by law. Why? (c) Name any three methods of contraception…
(a)
Name any two sexually transmitted diseases.
(b)
Prenatal sex determination is prohibited by law. Why ?
(c)
Name any three methods of contraception stating one side-effect of each.
OR 35. (a) Name a unisexual and a bisexual flower.
(b)
Define cross pollination. State how it is carried out.
(c)
Observe the diagram given below and name the parts marked as 'A' and 'B'.
Mention the function of each of these parts.
Marking-scheme solution
(a) Gonorrhoea, Syphilis, AIDS, Warts
(b) Because child sex ratio is declining/ due to reckless female foeticide.
(i) Oral pills/ Chemical method ; change the hormonal balance of the body.
(ii) Copper - T or loop; irritation of the uterus.
(iii) Surgical method; can cause infections.
(a) Unisexual - Papaya / Watermelon Bisexual - Hibiscus / Mustard
(b) The transfer of pollen grains from anther of one flower to stigma of another flower is called cross - pollination.
Transfer of pollen grains is carried out by some pollinating agents like wind, water and animals.
(c) A → Plumule - Future shoot B → Radicle - Future root
*Refer fig. $\displaystyle 7$•$\displaystyle 9$ Page $\displaystyle 121$ for diagram
More from Heredity
- Assertion: In human beings, males have 'XX' sex chromosomes and females have 'XY' sex chromosomes. Reason (R): Sex of the child is determined at the…2024
- In human beings, there are 23 pairs of chromosomes. Out of these 23 pairs of chromosomes (i.e. 46 chromosomes), 22 pairs of chromosomes are called…2025
- Explain how the proteins control the 'characteristics' in an organism with the help of an example of 'short height' trait in pea plant. Name the…2025
- Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds were crossed with each other which produced F_1…2026
- In an experiment to study independent inheritance of two separate traits: shape and colour of seeds, the ratio of the different combinations in F_2…2024
- Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular trait in each generation. He…2022
- "In human beings the genes inherited from the parents decide whether the newborn individual is male or female." Explain this statement with the help…2025
- List two differences between dominant traits and recessive traits. What percentage of pea plants in the F_2 generation were with yellow seeds in…2024
CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.