Which of the following ecosystem is most productive in terms of net primary productivity?

Which one of the following is not a cause of loss of biodiversity?

The role of restriction enzyme in recombinant DNA technology is:

Identify, which is not the recently extinct species?

Given below are some stages of human evolution. Arrange them in correct sequence (Past to Recent)
(A) Homo habilis
(B) Homo sapiens
(C) Homo neanderthalensis
(D) Homo erectus
Choose the correct answer from the options given below:

Read the passage and answer the question given below.
When a host is exposed to antigens, which may be in the form of living or dead microbes or other proteins, antibodies are produced in the host body. This type of immunity is called active immunity. Active immunity is slow and takes time to give its full effective response. Injecting the microbes deliberately during immunisation or infectious organisms gaining access into body during natural infection induce active immunity. When antibodies are directly given to protect the body against foreign agents, it is called passive immunity.
colostrum secreted by mother during initial stage of lactation provides passive immunity as it is rich in.

In flowering plants, double fertilization results in the formation of:

A slab of material of dielectric constant \( k \), having the same area as the plate of a parallel plate capacitor but has a thickness \( \frac{3}{5} \) of the distance between the plates \( d \), is inserted between the plates of the capacitor. When there is air between the plates, the potential difference is \( V_0 \). What is the potential difference between the plates of the capacitor after inserting the dielectric?

If \(a , b\) and \(c\) are distinct prime numbers then the value of \(\left|\begin{array}{lll}a-b & b-c & c-a \\ b-c & c-a & a-b \\c-a & a-b & b-c\end{array}\right|\) is equal to

Ethyl bromide is converted to succinic acid by using the following reagents in steps:
 A. \(KCN\)
B. \(Br_2\)
C. \(KOH\ (alc.)\)
D. \(H_2O/H^+\)
Choose the correct sequence of conversion:

Match List I with List II

LIST I	LIST II
A. Tubectomy	I. Barrier method
B. Copper ions	II. Surgical method of sterilisation in human male.
C. Cervical Cap	III. Surgical method of sterilisation in human female.
D. Vasectomy	IV. Suppress motility of sperms

Choose the correct answer from the options given below:

An electromagnetic wave moves in vacuum. Its speed is c. Choose the correct options about the characteristics of electromagnetic waves:
(A) \( c = \frac{1}{\sqrt{\mu_0 \epsilon_0}} \)
(B) Electromagnetic waves are transverse in nature.
(C) Both the electric field and magnetic field vibrate perpendicular to the direction of propagation of waves
(D) Electromagnetic waves are longitudinal in nature.
Choose the correct answer from the options given below:

Read the passage carefully and answer the Questions
The decomposition of \(N_2O_5\ (g)\) is given as
\(N_2O_5(g) \rightarrow 2NO_2(g) + \frac{1}{2}O_2(g)\)
The above reaction is found to be of first order.
The initial concentration of \(N_2O_5\) was \(1.24 \times 10^{-2}\ M\) at \(318\ K\).
The concentration \(N_2O_5\) after \(60\ minutes\) was \(0.20 \times 10^{-2}\ M\).
The rate constant of the reaction at \(318\ K\) is ______________ (\(log\ 6.2 = 0.792\))