Cold weather can cause citrus leaves to curl and so can water stress. Aphids are another cause.
The moon.
Leaf sheath and spikes
The lemon tree leaf has pinnate venation. A leaf with pinnate venation has one midrib extending from the petiole to the tip of the leaf with smaller veins branching off from the midrib.
I would check for mites. This sounds like something that is sucking the juices out of the leaves.
Simple is a single leaf, compound is three, or a cluster of leafs off of one stem. A simple leaf has single leaf lamina whereas compound leaf has more than one leaf lamina (leaflet).
The common name for lemon leaf is lemon balm.
stunted plants leaf curl up as a cup shape hard leaf midrib yellow leaves
New leaf growth is caused by the cold soil causing the leaf to curl and fall off producing a new leaf. The cause of the leaf to curl can be from an aphid species or different plant diseases.
parallel pinnate
Lemon leaf has reticulate venation
No. Lemon juice is a mixture of many different compounds.
Sunlight causes this.
No but you can use Bay leaf for curry leaf
The scientific name of lemon leaf is Citrus limon.
The moon.
Ovoid
The tomato leaf curl virus is a yellowing and upward curling of leaves on a tomato plant. It is a viral infection that has been transmitted through whiteflies. It will affect fruit production.