Which of the following blood groups is considered the universal donor? MCQ with Answer and Explanation

Explanation:
Peroxisomes contain enzymes like glycolate oxidase that participate in photorespiration, along with chloroplasts and mitochondria. They also detoxify peroxides. Lysosomes digest, mitochondria respire, chloroplasts photosynthesize.

Explanation:
The stem is characterized by the presence of nodes, which are the junctions where leaves and buds arise, and internodes, the segments between two nodes. While some stems are modified to grow underground (like potatoes or onions) for storage or perennation, the primary and most common form of the stem is aerial, growing above the ground. Statements 1 and 2 are correct.

Explanation:
Salivary amylase (ptyalin) hydrolyzes starch into maltose and dextrins, initiating carbohydrate digestion. The reason explains the presence of amylase in saliva.