Write the energy conversion that takes place in a hydropower plant.

A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F₁ pregeny?

Name one gustatory receptor and one olfactory receptor present in human beings.

Write a and b in the given flow chart of a neuron through which information travels as an electrical impulse.

$\left[\begin{array}{c}Denrite\end{array}\right]\stackrel{ }{\to }\left[\begin{array}{c}a\end{array}\right]\stackrel{ }{\to }\left[\begin{array}{c}b\end{array}\right]\stackrel{ }{\to } \left[\begin{array}{c}End Point of Newron\end{array}\right]$

If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram to support your answer.

A compound ‘X’ on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound ‘Y’. ‘X’ also reacts with sodium metal to evolve a colourless gas ‘Z’. Identify ‘X’, ‘Y’ and ‘Z’. Write the equation of the chemical reaction of formation of ‘Y’ and also Write the role of sulphuric acid in the reaction.

State the laws of refraction of light. Explain the term ‘absolute refractive index of a medium’ and write an expression to relate it with the speed of light in vacuum.

What is meant by the power of a lens? Write its SI unit. A student uses a lens of focal length of 40 cm and another of –20 cm. Write the nature and power of each lens.

Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival - the one reproducing asexually or the one reproducing sexually ? Give a reason to justify your answer.

Show how would you join three resistors, each of resistance 9Ω so that the equivalent resistance of the combination is (i) 13Ω (ii) 6Ω?