What is the defense mechanism adopted by Acacia and Cactus to protect themselves from predators (herbivores)?

Two different sex chromosomes, designated as Z and W involved in sex determination are found in:

Arrange the following steps of gene therapy for Adenosine deaminase deficiency in sequence.
(A) Patients lymphocytes are grown in culture outside the body
(B) Functional ADA cDNA is introduced into lymphocytes using retroviral vector
(C) Lymphocytes are taken from the blood of the patient
(D) Genetically engineered lymphocytes introduced back to the patient body
Choose the correct answer from the options given below :

Despite occupying about 70% of the surface area of earth, the productivity
of the oceans is low because-

Genes which code for a pair of contrasting traits are knows as:

Recombinant DNA is directly injected into the nucleus of an animal cell.
This method is known as-

The person with karyotype 44+XXY is suffering from:

What is the source of nitrogen in Gabriel synthesis of primary aliphatic amines?

Read the passage carefully and answer the questions The resistance ( \(R\) ) of an object is given by the expression \(R=\rho \frac{l}{A}\).
The inverse of \(R\) is called conductance and the inverse of \(\rho\) is called conductivity or specific conductance represented by \(\kappa\).
The conductivity depends upon the nature of the material (insulator, semiconductor or conductor) and the temperature of the substance.
Similarly, the conductance due to the ions present in the solution (ionic conductance) depends upon the nature of the electrolyte, size of ions, the nature of the solvent and the temperature.
Molar conductivity ( \(\Lambda_m\) ) of a solution at a given concentration is the conductance of volume \(V\) containing one mole of electrolyte kept between two electrodes of area \(A\) and unit distance apart. It is given by the expression \(\Lambda_m=\kappa V .\)
Molar conductivity increases with decrease in concentration and when concentration approaches zero, it is called limiting molar conductivity.
The decrease is linear for a strong electrolyte. However, for a weak electrolyte the change is gradual at higher concentrations and sharp near zero concentration.
Using limiting molar conductivity values of strong electrolytes we can calculate the limiting molar conductivity of weak electrolytes using Kohlrausch law of independent migration of ions.
From molar conductivity and limiting molar conductivity we can determine the degree of dissociation \(\left(\frac{\Lambda_m}{\Lambda_m^0}\right)\) and the ionization constant of a weak acid.
For a weak acid like acetic acid, the correct expression for the ionisation constant at concentration \(c\) is

Arrange the following electromagnetic waves in decreasing order of their frequencies.
(A) FM radio waves
(B) UV rays
(C) Gamma rays
(D) X-rays
Choose the correct answer from the options given below:

The general solution of the differential equation \(y d x-\left(x+2 y^2\right) d y=0\) is:

Which forest also known as the 'lungs of the planet earth'?

Industrial melanism in peppered moths is an example of: