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Option D is the correct answer. This is because, Spirogyra exist as filament that occurs in rows or chains. Besides being free-living, organisms can also exist as colonies, filaments, or in a multicellular state. Spirogyra exists as filaments. It's a type of green algae that grows in long, unbranched chains of cells, forming these thread-like structures. These filaments are commonly found in freshwater habitats like lakes and ponds, often referred to as "water silk" or "pond silk".

Option A is correct. This is because, the part that makes kidney perform its osmoregulation function in man is the nephron i.e. the production or formation of urine is done through nephron in the kidney.

The Class Gastropoda (in Phylum Mollusca) includes the groups pertaining to snails and slugs.

Option C is correct. This is because, bed bug is not an animal pest that can affect crop plants in a farmland. It can only affect animals like homo sapiens etc.

Option B is correct. This is because, when the male sperm and female egg come in contact with each other, it becomes a fertilized egg or cell. When this happen, it results to forms the zygote.

Option A is correct. This is because halophytes are plants that live successfully in a marine(salt water) habitat.

No expanded working has been attached for this question yet. The verified answer is Option D.

Option B is the correct answer. This is because, cholera is a water borne disease (disease caused by contaminated water).

No expanded working has been attached for this question yet. The verified answer is Option B.

Option D is correct. This is because, placenta establishes an intimate connection between the embryo and the mother. This connects the placenta to transfer food,water and oxygen from mother to the embryo or foetus The placenta supplies food and nutrients to the fetus, not the umbilical cord. The placenta is the organ that develops in the uterus during pregnancy and attaches to the uterine wall, providing the fetus with oxygen and nutrients through the umbilical cord. The umbilical cord is the structure that physically connects the fetus to the placenta.

Option A is the correct answer. This is because, cochlea is the structure of the mammalian hearing organ called ear.

Option C is correct. This is because for deoxygenated blood (blood containing carbon (iv) oxide) in the heart to be returned back to the lungs for the removal of the CO2,pulmonary artery aids in the process.

Option A is correct. This is because, cell is the basic functional and structural unit of life.

Options A, B and C are not correct. This is because, they are all true fruits (i.e, the fruits that develops solely from a fertilized ovary. Option D is correct. This is because, pineapple is a false fruit (a fruit developed or formed from the ovary and other floral parts of the plant or fruit flowers.

Option D is correct. This is because, tsetse fly is the vector that transmits trypanosome that causes trypanosomiasis or sleeping sickness.