Question

Pinus seed is -
A. Monocotyledonous
B. Dicotyledonous
C. Polycotyledonous
D. Tetracotyledonous

Answer 1

Hint:
The long shoots of pinus enclose the apical bud and grow indefinitely. Numerous scaly leaves are present on the long shoot. Dwarf shoots have no apical bud and thus are limited in their growth. They occur on the long shoot in the axil of scaly leaves.

Complete answer:
The mature seed in Pinus is composed of hard testa, thin tegmen, endosperm, embryo, and cap like perisperm. The embryo includes a short axis bearing ten cotyledons.
Therefore, Pinus seeds have poly cotyledons.

Hence, Option (c) is the correct answer.

Additional Information:
Peripheral Morphology of Pinus:
1. Pinus is a hefty, perennial, evergreen plant.
2. Branches rise spirally and thus the plant gives the manifestation of a conical or pyramidal structure.
3. Sporophytic plant of pinus is differentiated into roots, stem, and acicular needle-like leaves.
4. A taproot with a small number of root hairs is present but it vanishes soon. Later on, many lateral roots enlarge, which help in absorption and fixation.
5. The definitive branches of these roots are covered by a coating of fungal hyphae called ectotrophic mycorrhiza.
6. Two types of branches are there: long shoots and dwarf shoots. These are also called branches of unlimited and limited growth, respectively.

Note:
Pinus is monoecious, male and female floras are present in the form of cones or strobili on the separate branches within the same plant. Many male cones are present mutually in the form of clusters, each of which consists of many microsporophylls. The female cones compose of megasporophylls. The male cones on the plant expand much prior to the female cones.