No but you can use Bay leaf for curry leaf
None. Fresh curry leaves are not related in any way to curry powder. Curry powder is a ground blend of different spices, not including the fresh leaf of the curry tree. There is really no good substitute for fresh curry leaves in a recipe. You could use basil leaves, but the flavor and aroma will be quite different.
The common name for lemon leaf is lemon balm.
The Tagalog word for curry leaf is "dahon ng kari."
You can substitute a mix of cumin, turmeric, coriander, and cayenne pepper for curry powder in a recipe.
Lemon leaf has reticulate venation
Yes.
A substitute for lemon juice in recipes can be vinegar or lime juice.
A good substitute for curry powder in a recipe is a mix of cumin, turmeric, coriander, and cayenne pepper.
NO
The scientific name of lemon leaf is Citrus limon.
A good substitute for lemon in recipes is lime, vinegar, or orange zest.
Curry powder is not a substitute for dried or fresh curry leaves. Curry leaves are not in any of the curry powders. Curry powder is a mix of spices such as turmeric, coriander and garam masala. As far as I've been able to tell there is not a good substitute for curry leaves. You can add bay leaves, basil or lime leaves, but it changes the flavor. If you can't find curry leaves locally check an online Indian store.