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.
Identify the labelled parts P, Q, R, and S in the stages of a dicot embryo shown in the diagram.
Choose the option that indicates correct labelling of 'P', 'Q', 'R', and 'S' of embryo in different stages of its development.
Match the following
List - I (Transgenic Plant) | List - II (Resistance) | ||
---|---|---|---|
A. | Papaya | I. | Phytophthora |
B. | Bt cotton | II. | Ring spot virus |
C. | Tomato | III. | Insect |
D. | Potato | IV. | Pseudomonas |
The following graph indicates the system containing 1 mole of gas involving various steps. When it moves from Z to X, the type of undergoing process is: