Step 1: Understanding Gymnosperm Pollination Gymnosperms exhibit direct pollination since their ovules are exposed (naked) and pollen lands directly on the ovule. This is in contrast to angiosperms, where pollen lands on the stigma before fertilization.
Step 2: Evaluating the Assertion and Reason - Assertion (A) is correct: Gymnosperms have direct pollination. - Reason (R) is correct: The ovules are exposed, leading to direct pollen reception.
- (R) correctly explains (A), making option (1) correct.
Observe the following data given in the table. (\(K_H\) = Henry's law constant)
Gas | CO₂ | Ar | HCHO | CH₄ |
---|---|---|---|---|
\(K_H\) (k bar at 298 K) | 1.67 | 40.3 | \(1.83 \times 10^{-5}\) | 0.413 |
The correct order of their solubility in water is
For a first order decomposition of a certain reaction, rate constant is given by the equation
\(\log k(s⁻¹) = 7.14 - \frac{1 \times 10^4 K}{T}\). The activation energy of the reaction (in kJ mol⁻¹) is (\(R = 8.3 J K⁻¹ mol⁻¹\))
Note: The provided value for R is 8.3. We will use the more precise value R=8.314 J K⁻¹ mol⁻¹ for accuracy, as is standard.