Bt cotton is genetically modified to resist: MCQ with Answer and Explanation

Explanation:
The domesticated silkworm, Bombyx mori, is a monophagous insect that feeds exclusively on the leaves of the mulberry plant (Morus alba). Honeybees perform a 'waggle dance' on the honeycomb to communicate the direction and distance of food sources to other worker bees. Fish farming is called pisciculture or aquaculture; sericulture specifically refers to the rearing of silkworms for silk production. Thus, statements 1 and 2 are correct.

Explanation:
Human somatic cells have 46 chromosomes: 44 autosomes and 2 sex chromosomes (XX or XY). Sperm cells are haploid (n=23), containing 22 autosomes and one sex chromosome (either X or Y). The ovum also has 22 autosomes and one X. Fertilization restores 44 autosomes plus XX or XY. So sperm has 22 autosomes.

Explanation:
Collenchyma cells have unevenly thickened walls, providing mechanical support and flexibility to growing plant parts like stems. Sclerenchyma consists of dead cells with heavily lignified, thick walls, providing rigid strength to plant parts. Parenchyma cells are living, thin-walled, and serve as the primary packing tissue, storing food, water, and air. All three statements are correct.