__________________ are known as ribbon worms.

• A) Nemerteans
• B) Nematodes
• C) Platyhelminths
• D) Annelids

----------------------------is also known as the third eye.

• A) Thyroid Gland
• B) Parathyroid gland
• C) Pineal gland
• D) Parathyroid gland

The pineal gland is located behind the ----------------------- cerebral ventricle in the brain between the two cerebral hemispheres.

• A) 2nd
• B) 1st
• C) 3rd
• D) 4th

Darkness makes Pineal gland to produce ----------------.

• A) Throxine
• B) T4
• C) Melatonin
• D) ADH

The neurosecretory cells in the _____________ of some tapeworms, control shedding of the proglottids or the initiation of strobilization.

• A) Neuropeptides
• B) Scolex
• C) Brain
• D) Spinal Cord

------------------- stimulates contraction of the uterus or uteri to aid in the expulsion of the offspring and promotes the ejection of milk from the mammary glands to provide nourishment for the newborn.

• A) ADH
• B) Oxytocin
• C) Lactin
• D) Prolactin

When a mammal becomes dehydrated-------------------- is released and increases water absorption in the kidneys so that less urine is secreted.

• A) Oxytocin
• B) ADH
• C) T4
• D) T3

Squid Belongs to Phylum____________.

• A) Nematoda
• B) Arthropoda
• C) Annelida
• D) Mollusca

The ring of ganglia that constitutes the central nervous system of molluscs is richly endowed with __________________________ .

• A) Neurosecretory cells
• B) Neurons
• C) Dividing Cells
• D) Nerve Cells

Choose the Correct Statement.

• A) When MIH is present in high concentrations, the Y-organ is active.
• B) When MIH is present in low concentrations, the Y-organ is inactive.
• C) When MIH is absent, the Y-organ is inactive.
• D) When MIH is present in high concentrations, the Y-organ is inactive.

Hormones are required in very huge quantities.

• A) False
• B) True
• C)
• D)

Which of the following function is performed by hygroreceptors ?

• A) Respond to light
• B) Respond against gravity
• C) Detects water content in air
• D) Respond to chemicals

Which part of brain consists of cerebrum and thalamus?

• A) Hind brain
• B) Lateral brain
• C) Mid brain
• D) Fore brain

What is the composition of central nervous system?

• A) Brain only
• B) All nerves other than brain and spinal cord
• C) Brain and spinal cord
• D) Spinal cord only

Hormones are directly secreted into the blood stream.

• A) False
• B) True
• C)
• D)

How do dolphins and whales sense?

• A) Echolocation
• B) Vision
• C) Taste
• D) Smell

Eye shine can be seen in many animals.

• A) False
• B) True
• C)
• D)

A specialized organs in the body that secrete a specific substance is named as

• A) Hormones
• B) Glands
• C) Neurons
• D) Nerves

Which nervous system includes Fight or flight activity?

• A) Non-sympathetic
• B) Parasympathetic
• C) Asympathetic
• D) Sympathetic

Integration communication, and coordination of all physiological processes depend on chemical messengers.

• A) False
• B) True
• C)
• D)