Double fertilization is a characteristic feature of:
A. Bryophytes
B. Pteridophytes
C. Angiosperms
D. Gymnosperms
Answer: Option C
Solution (By JKSSB Mock Tests)
In angiosperms, one sperm fertilizes the egg (zygote) and the other fuses with two polar nuclei (triploid endosperm). This double fertilization is unique.
Explanation:
Charles Darwin's theory of evolution, presented in 'On the Origin of Species' (1859), is based on two main concepts: branching descent (all organisms are related through common ancestry) and natural selection (survival of the fittest). Natural selection states that individuals with traits better suited to their environment are more likely to survive and reproduce, passing those traits to the next generation.
Explanation:
Stem bears leaves and reproductive structures. It is positively phototropic (grows towards light). Leaves are the main photosynthetic organs. Roots grow downward.
Explanation:
Folic acid is crucial for DNA synthesis and cell division; deficiency during early pregnancy increases risk of neural tube defects like spina bifida. Supplementation is recommended. B₁ is for carbohydrate metabolism, B₁₂ for nerve function, C for collagen.
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