The type of root system where many roots arise from the base of the stem, as in grasses, is called: MCQ with Answer and Explanation

Explanation:
Genes are specific sequences of DNA that code for proteins or RNA, and they are arranged linearly on chromosomes within the nucleus. DNA replication is semi-conservative, meaning each newly synthesized DNA molecule consists of one original parental strand and one newly synthesized strand, as proven by the Meselson-Stahl experiment. RNA is typically single-stranded, allowing it to fold into complex shapes and perform various functions, unlike the double-stranded DNA helix. Thus, statements 1 and 2 are correct.

Explanation:
2,4-D is a synthetic auxin widely used as a selective herbicide. It kills broadleaf dicot weeds without harming monocot crops like wheat, rice, and lawn grasses, as dicots are more sensitive to auxin overdoses, which cause uncontrolled growth and eventual death. NAA and gibberellic acid are used for rooting and growth promotion, and kinetin is a cytokinin.

Explanation:
The pineal gland is a small, pinecone-shaped gland located in the epithalamus, near the center of the brain. In humans, it is not a true eye, but it is photosensitive; it receives information about the light-dark cycle from the retina via the suprachiasmatic nucleus and the sympathetic nervous system, and uses this to regulate the secretion of melatonin, thus controlling circadian rhythms. In some lower vertebrates (like certain reptiles, amphibians, and fish), the pineal complex includes a parietal eye (or 'third eye'), a light-sensitive organ on the top of the head that can literally detect light and shadows, helping with camouflage and predator detection.