Question

In Nepenthes the pitcher is formed from
A. Leaf base
B. Lamina
C. Leaf Alex
D. Stipule

Answer 1

Hint: In carnivorous plants, the leaves are specially adapted to trap and digest insects according to their nitrogen requirements. Many insectivorous plants have parts of the plant that are modified to trap insects. The mouths of insectivorous plants have hair-layered edges that break or close as soon as the insects touch the hair, thus keeping insects away.

Complete answer:
leaf-pitcher is a device that is used to trap insects by the plants that grow in nitrogen deficient soil to fulfil their nitrogen requirements.
In the case of plants like Nepenthes and Dischidia the lamina transforms into a pitcher-like structure called a leaf-pitcher.
Nepenthes, also known as pitcher-plant, has a special type of leaf. The underside of the leaf is winged, the stem is fibrous, and the dish transforms into a jug-shaped structure with a coloured lid that attracts insects and keeps the inside closed while it is immature. The inner edge of the container is covered with back-facing hair and lots of small scales that allow insects to glide and catch. On the inner wall of the jar, there are glands that secrete digestive juice into the holes in the jar. Insects lie here, and debris falls to the floor. There is a kettle of roses in Sarracenia. The kettle looked like Nepenthes' kettle, but they are sessile.

So, the correct option is (B) leaf blade or lamina.

Note: Insectivorous plants are plants that can produce carbohydrates due to the presence of chlorophyll. However, they can't synthesize enough protein because it grows in soils that don't contain nitrogen. They overcome nitrogen deficiency by trapping and grinding insects. For this reason, the leaves of such plants are specially modified in various ways.
Utricularia is another carnivorous plant that grows in water. Strongly dissected leaves immersed in water. Several segments of leaves develop into bladders.
In Drosera, the lamellar part has many outstretched spiny hairs. Each hair has a shiny, sticky bead that contains digestive enzymes.