Identify the correct statement about the human reproductive system: MCQ with Answer and Explanation

Explanation:
In C4 plants, the leaves exhibit Kranz anatomy, where the vascular bundles are surrounded by a distinct layer of bundle sheath cells. These bundle sheath cells are large and contain numerous, large chloroplasts that lack grana (agranal). Because they lack grana, they cannot perform the light-dependent reactions (which require PSII, located in the grana) but are highly efficient at performing the Calvin cycle (light-independent reactions) in a high CO2 environment, minimizing photorespiration.

Explanation:
The placenta is a vascular organ formed from fetal chorion and maternal decidua, facilitating exchange without mixing blood. The umbilical cord connects fetus to placenta.

Explanation:
Platelets adhere to damaged vessel walls, aggregate, and release clotting factors, forming a plug and initiating the coagulation cascade. RBCs carry oxygen, WBCs fight infection, lymphocytes are immune cells.