Which of the following material takes longer time for decomposition?

Read the passage carefully and answer the questions based on the passage:
Pollen pistil interaction involves all events from the landing of pollen grains on the stigma until the pollen tube enters the embryo sac (when the pollen is compatible). When a pollen tube grows through the style and enters into the ovules, it finally discharges two male gametes in one of the synergids. Syngamy and triple fusion are two fusion events occur in angiosperms. Thus, angiosperms exhibit double fertilization. The products of these fusions are the diploid zygote and triploid primary endosperm nucleus. Zygote develops into embryo and primary endosperm cell forms the endosperm tissue. The developing embryo passes through different stages before maturation.
Formation of diploid zygote is a result of:

Which layer of microsporangium nourishes the developing pollen grains?

Arrange the following events in correct sequence :
(A) Virus infects macrophages
(B) Viral DNA is produced by reverse transcriptase
(C) Viral DNA incorporates into host genome
(D) Viral RNA is introduced into macrophages
(E) New viruses are produced
Choose the correct answer from the options given below :

Heroin, commonly called smack is chemically _________ which is a white, odourless, bitter crystalline compound.

Identify the correct statements with respect to Homo habilis
A. Homo habilis had a brain size of 650-800cc
B. They probably did not eat meat
C. They lived near east and central Asia
D. These were the first human-like creature
Choose the correct answer from the options given below:

Chronologically arrange the names of scientists who contributed to the study of genetics.
(A) Alfred Sturtevent
(B) Gregor Mendel
(C) Thomas Hunt Morgan
(D) Sutton and Boveri
Choose the correct answer from the options given below:

Which of the following statements are correct?
(A) In reverse bias of a p-n junction, negative terminal of the battery is connected to p-side of the junction,
(B) Reverse bias does not support the potential barrier at the junction.
(C) In reverse bias, a few minority charge carriers cross the junction.
(D) Resistance of p-n junction is high in reverse bias, reducing the current to a negligible value.
Choose the correct answer from the given options.

The role of ethidium bromide in gel electrophoresis is:

If the sequence of one strand of DNA is written as: 5'-ATCGTGCTATGAGCATGC-3'.
The sequence of its complementary strands will be?

The correct IUPAC name for \(C H _{ 2 }= C H C H _{ 2 } N H C H _{ 3 }\).

What is the ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum ?

Which of the following is not correct?