Assertion: Etiolation is an energy conserving strategy in plants.
Reason: It helps plants growing in the dark reach the light before they die.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

The most important colors in regulating photomorhogenesis in plants are:
1. Violet and Yellow
2. White and Black
3. Green and Orange
4. Red and Blue

The biologically active form of the phytochrome is:
1.${\mathrm{P}}_{\mathrm{r}}$
2. ${\mathrm{P}}_{\mathrm{fr}}$
3. Both
4. None

When lettuce seeds illuminated by red light are then exposed to far red light:

1. ${\mathrm{P}}_{\mathrm{r}}$ is converted to ${\mathrm{P}}_{\mathrm{fr}}$ and germination is inhibited
2. ${\mathrm{P}}_{\mathrm{r}}$ is converted to ${\mathrm{P}}_{\mathrm{fr}}$ and germination is initiated
3. ${\mathrm{P}}_{\mathrm{fr}}$ is converted to ${\mathrm{P}}_{\mathrm{r}}$ and germination is inhibited
4. ${\mathrm{P}}_{\mathrm{fr}}$ is converted to ${\mathrm{P}}_{\mathrm{r}}$ and germination is initiated

Etiolated seedlings become normal when exposed to:
1. Blue light
2. Green light
3. Red light
4. Far red light

An incandescent light bulb has a high output of red light. Which of the following plant process will be least promoted by it:
1. photosynthesis.
2. seed germination.
3. phototropism.
4. flowering.

What is incorrect regarding the results of experiments conducted on coleoptiles of canary grass and oats by Charles Darwin and Francis Darwin on phototropism?