Annie was conducting research on the number of fruits produced by watermelon under different conditions. She grew 25 watermelon plants each in both glass house A and B. She introduced pollinators in glass house A only. 

(a) What difference will she observe in the number of fruits produced in the two glass houses? Explain with reason.

(b) List 3 changes that will occur in a flower once it gets fertilized.

Which of the following equations represent redox reactions and what are the values for ‘p’ and ‘q’ in these equations?

• Equation 1 : $\text{Fe}$2 \text O3 (\text s) + 2\text {Al}(\text s) \longrightarrow \text{Al}2 \text O3 (\text s) + \text {pFe}(\text l) + \text {Heat}
• Equation 2 : $2\text C$4 \text H{10} (\text g) + 13\text O2(\text g) \xrightarrow {\Delta} 8\text {CO}2 (\text g) + \text {qH}_2 \text O(\text g)

options

1. Only equation 1 is a redox reaction, p = 1 and q = 3
2. Both equations 1 and 2 are redox reactions, p = 2 and q = 4
3. Only equation 2 is a redox reaction, p = 2 and q = 10
4. Both equations 1 and 2 are redox reactions, p = 2 and q = 10

An iron nail is added to each of the two test tubes ‘P’ and ‘Q’ containing aqueous copper (II) sulphate and aqueous silver nitrate respectively. Which of the following observation is correct?

options

1. In test tube ‘P’ iron nail is coated with a blue coating and in test tube ‘Q’ there is no reaction.
2. Iron nail is coated with a brown coating in test tube ‘P’ and silver coating in test tube ‘Q’.
3. There is no reaction in either of the test tubes ‘P’ or ‘Q’.
4. There is no reaction in test tube ‘P’ but a silver coating on iron nail is seen in test tube ‘Q’.

Methyl orange is added to dilute hydrochloric acid and to aqueous sodium hydroxide. What is the colour of the methyl orange in each solution?

options

1. A
2. B
3. C
4. D