Yoga

Step 1: Surya Namaskar.
Surya Namaskar, or Sun Salutation, is a set of 12 physical postures that are typically performed in a flowing sequence.
It is a sequence of movements that includes stretching, bending, and strengthening exercises.
Step 2: Analyzing the options.
- (1) 18: This is incorrect; the standard Surya Namaskar involves 12 steps.
- (2) 12: Correct, Surya Namaskar is done in 12 steps.
- (3) 10: Incorrect.
- (4) 9: Incorrect.
Step 3: Conclusion.
Thus, the correct number of steps in Surya Namaskar is 12.

Step 1: Understanding the Vrikshasana pose.
Vrikshasana, also known as the Tree Pose, is a standing posture in yoga that involves balancing on one leg with the other leg placed on the inner thigh or calf, with hands brought together in prayer position above the head.
Step 2: Analyzing the effects of the pose.
- (1) Improves breathing: Although yoga poses improve breathing, the primary benefit of Vrikshasana is balance, not breathing per se.
- (2) Gives a sense of balance: Correct. The Vrikshasana pose challenges your balance and strengthens the lower limbs, thereby enhancing physical and mental equilibrium.
- (3) Improves flexibility of the trunk: While yoga poses can improve flexibility, Vrikshasana primarily focuses on balance, not trunk flexibility.
- (4) Strengthens upper limb muscles: This pose does not significantly target the upper limbs but instead engages the legs and core for stability.
Step 3: Conclusion.
The correct answer is that the major effect of Vrikshasana is to give a sense of balance. This pose is excellent for developing both physical and mental balance.