STD 11 - 7. Structural organisation in animal — BIOLOGY STD 11 Science — Question

$(i)$ Mouth opens into a short tubular pharynx, leading to a narrow tubular passage called oesophagus.

$(ii)$ Gizzard helps in grinding the food particles.

$(iii)$ A ring of $6-8$ blind tubules called hepatic or gastric caecae is present at the junction of foregut and midgut, which secrete digestive juice.

$(iv)$ At the junction of midgut and hindgut is present another ring of $100-150$ yellow coloured thin filamentous malphigian tubules which help in removal of excretory products from haemolymph.

$(i)$ is released by sympathetic fibers

$(ii)$ is released by parasympathetic fibers

$(iii)$ increases the heart rate

$(iv)$ decreases blood pressure.

Which of the above statements are correct ?