The plant tissue that provides mechanical support and is dead at maturity is:
A. Sclerenchyma
B. Aerenchyma
C. Collenchyma
D. Parenchyma
Answer: Option A
Solution (By JKSSB Mock Tests)
Sclerenchyma cells have thick, lignified secondary walls and are often dead at maturity, providing rigid structural support. Fibers and sclereids are examples. Parenchyma is living and thin-walled, collenchyma living with uneven thickening, aerenchyma has air spaces.
Explanation:
Riboflavin (vitamin B₂) is the precursor of flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD), which are electron carriers in redox reactions. Thiamine is TPP, niacin NAD/NADP, pantothenic acid CoA.
Explanation:
Double fertilization in angiosperms was discovered by the Russian botanist Sergei Nawaschin in 1898 in Lilium and Fritillaria. One male gamete fuses with the egg to form the zygote, the other with the secondary nucleus to form the triploid endosperm. Strasburger discovered fertilization in flowering plants, Amici observed pollen tube, Hofmeister studied alternation of generations.
Explanation:
Joint Forest Management (JFM) is a concept introduced in India (first in West Bengal in 1988) to address the problem of forest degradation. It involves establishing a partnership between the state forest departments and local communities living near the forests. The communities are given the responsibility to protect and manage the degraded forest lands in exchange for a share in the produce (like non-timber forest products, timber) and employment opportunities, fostering a sense of ownership and sustainable conservation.
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