76. What is the result of pollination followed by fertilization in plants?
(a) Formation of flower
(b) Formation of fruit
(c) Formation of seed
(d) Formation of roots
Answer:
(c) Formation of seed
Explanation:
After fertilization in flowering plants, the zygote develops into an embryo inside the ovule, which subsequently develops a tough coat and turns into a seed.
77. Where does fertilization occur in human females?
(a) Uterus
(b) Cervix
(c) Fallopian tube
(d) None of these
Answer:
(c) Fallopian tube
Explanation:
In human females, fertilization (the fusion of sperm and egg) takes place in the oviduct, also known as the Fallopian tube.
78. Which among the following diseases is not sexually transmitted?
(a) Syphilis
(b) Hepatitis
(c) HIV-AIDS
(d) Gonorrhea
Answer:
(b) Hepatitis
Explanation:
While Hepatitis B can be sexually transmitted, “Hepatitis” as a broad category (like Hepatitis A) is generally food/water-borne, making it the odd one out. Syphilis, HIV/AIDS, and Gonorrhea are classic examples of explicitly sexually transmitted diseases (STDs).
79. In human males, the testes lie in the scrotum because it helps in the:
(a) process of mating
(b) formation of sperms
(c) easy transfer of gametes
(d) secretion of estrogen
Answer:
(b) formation of sperms
Explanation:
The scrotum holds the testes outside the abdominal cavity to maintain a temperature lower than normal body temperature, which is essential for viable sperm formation (spermatogenesis).
80. Which of the following is an example of an acquired trait, not an inherited one?
(a) Colour of eyes
(b) Colour of skin
(c) Texture of hair
(d) Size of body
Answer:
(d) Size of body
Explanation:
Body size/weight can drastically alter due to environmental factors, nutrition, or injury over a lifetime. It does not permanently change the DNA of germ cells, making it an acquired trait rather than inherited.
