Parthenocarpic fruit is

The utility of a microorganism like $Trichoderma$ $harzianum$ has been proven in which of the following?

The value of $\lambda$ such that $\lambda x^2-10 x y+12 y^2+5 x-16 y-3=0$ represents a pair of straight lines is:

The curve $f(x) = e^x \sin x$ is defined in the interval $[0, 2\pi]$. The value of $x$ for which the slope of the tangent drawn to the curve at $x$ is maximum,is

The following band-energy diagram represents:

Which one of the following generally acts as an antagonist to gibberellins?