List of practice Questions

What do you mean by reflex arc? Draw a simple reflex arc and label the following parts: (i) Receptor (ii) Sensory nerve (iii) Motor nerve (iv) Effector.

What is excretion?

Draw a labeled diagram of the human excretory system.

Mention one function of the placenta.

What is the phenotypic ratio of a dihybrid cross in the F2 generation?

If an 'X' chromosome-bearing sperm fertilizes an egg, what will be the sex of the child?

What is the increase in the concentration of pollutants at the highest trophic level called?

Write the full form of UNEP.

Write two differences between arteries and veins.

What is a food chain?

The chemical substance responsible for the depletion of the ozone layer is -

Where is bile synthesized?

What are the end products of fat digestion?

Which part of the brain maintains posture and body balance?

What is pollination?

The xylem in plant bodies is responsible for which of the following functions?

From where is the growth hormone secreted?

Which of the following is NOT a part of the male reproductive system?

A box contains 5 red and 7 white balls. Two balls are drawn at random. What is the probability that both are red?

Let $\vec{a}=2\hat{i}-\hat{j}-\hat{k}$, $\vec{b}=\hat{i}+3\hat{j}-\hat{k}$ and $\vec{c}=2\hat{i}+\hat{j}+3\hat{k}$. Let $\vec{v}$ be the vector in the plane of $\vec{a}$ and $\vec{b}$, such that the length of its projection on the vector $\vec{c}$ is $\dfrac{1}{\sqrt{14}}$. Then $|\vec{v}|$ is equal to

Which of the following are true for a single slit diffraction? A. Width of central maxima increases with increase in wavelength keeping slit width constant.
B. Width of central maxima increases with decrease in wavelength keeping slit width constant.
C. Width of central maxima increases with decrease in slit width at constant wavelength.
D. Width of central maxima increases with increase in slit width at constant wavelength.
E. Brightness of central maxima increases for decrease in wavelength at constant slit width.