The infective stage of the malarial parasite in humans is: MCQ with Answer and Explanation

Explanation:
Carrot and radish are examples of modified taproots where the primary root swells to store food. Prop roots are adventitious (banyan), fibrous roots are fine and branching (grasses), adventitious arise from stems/leaves.

Explanation:
Somatostatin is a powerful, universal inhibitory peptide hormone. In the gastrointestinal tract and pancreas, it is secreted by the Delta (D) cells of the pancreatic islets and the D cells of the gastric and intestinal mucosa. Its primary role in the GI tract is to act as a paracrine inhibitor, suppressing the release of almost all other gastrointestinal hormones, including gastrin, secretin, cholecystokinin (CCK), vasoactive intestinal peptide (VIP), and gastric inhibitory peptide (GIP). It also inhibits gastric acid secretion, pancreatic enzyme secretion, and intestinal motility, acting as a 'brake' on the digestive system.

Explanation:
The bottleneck effect is a form of genetic drift that occurs when a population's size is drastically reduced for at least one generation due to a severe environmental event (like a natural disaster, disease, or overhunting). The surviving population is a random, small sample of the original, and its gene pool may not represent the original population's genetic diversity. This leads to a significant loss of genetic variation, making the population more vulnerable to future changes.