Which vector was used to introduce nematode specific gene into the host plant?

Arrange the given organisms involved in an ecosystem in correct sequence from lower to higher order.
(A) Fish
(B) Phytoplankton
(C) Man
(D) Zooplankton
Choose the correct answer from the options given below:

The amount of biomass or organic matter produced per unit area over a time period by plant during photosynthesis is defined as:

The second trophic level in an aquatic ecosystem is:

Observe the given figures and answer the question

Seeds shown in Figure I and Figure II are:

Which of the followings were dominant during the 'Jurassic' period?
(A) Ferns
(B) Seed ferns
(C) Conifers
(D) Dinosaurs
Choose the correct answer from the options given below:

The karyotype of an individual was found to be 44 + XXY. The individual is suffering from which of the following disorder?

The value of \(x\), for which the function \(f(x)=x(x-2)\) attains its minimum value, is:

If the function \(f(x)=\left\{\begin{array}{ll}\frac{\sin 3 x}{x}, & \text { if } x \neq 0 \\ \frac{3 k}{2}, & \text { if } x=0\end{array}\right.\) is continuous at \(x=0\), then the value of \(k\) is :

The relative lowering of vapor pressure is equal to the

Which is known as 'Terror of Bengal'.?

Electrostatics deals with the study of forces, fields and potential arising from static charges. Which of the following statements are correct ?
(A) Electrostatic force is a conservative force
(B) Charge is quantized because only integral number of electrons can be transferred from one body to the other
(C) In a uniform electric field E , an electric dipole experiences a torque \(\tau\) and a net force F .
(D) The electric field lines start from positive charges and end at negative charges. If there is a single charge, these may start or end at infinity.
(E) If the uniform surface charge density of an infinite plane sheet is positive, the electric field is directed away from the plate.
Choose the correct answer from the options given below :

On an optical bench of 150 cm, a student used a concave mirror of focal length 20 cm to observe object distance (u) and image distance (v) respectively as :
(A) (40 cm, 10 cm)
(B) (60 cm, 15 cm)
(C) (80 cm, 38 cm)
(D) (60 cm, 30 cm)
(E) (40 cm, 40 cm)