Control And Coordination - MCQ Test (22-11-2017) - Class 10 MCQ

Axon is the longest part of neuron that connects cell body and nerve ending. Axons are in effect the primary transmission lines of the nervous system.

Central nervous system (CNS) controls the activities of internal organs such as hormone release, movement of food through the stomach and intestines, and the sensations from and muscular control to all internal organs.

Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.

Thyroxin is one of the major hormone secreted by thyroid gland as well as Calcitoninis a hormone secreted by the thyroid gland that reduces the concentration of blood calcium level when it has risen to an above normal level. 

The medulla oblongata is located in the brain stem, anterior to cerebellum. This is a cone-shaped nerve cell located in the hind brain, which controls a number of involuntary functions like coughing, sneezing and vomitting.

Cytokinin hormone is responsible for cell division that help in growth of plants. It is found in sites of active cell division in plants for example: Roots tips,seeds,fruits and leaves.

A synapse is an important part of the nervous system involved in the transmission of nerve signals. 

Pancreas is known as a mixed gland because it performs functions of both exocrine and endocrine glands; and Most hormones produce an effect on specific target tissues that are sited at some distance from the gland secreting the hormone.

Pancreas acts as dual gland as pancreas has the dual function of secreting hormones into blood (endocrine) and secreting enzymes through ducts (exocrine).

progestrone hormone is released during parturition that creates uterine contraction like situation  that cause labour pain.

Nastic movements are plant movements that occur in response to environmental stimuli but unlike tropic movements.

When blood vessels dilat, the flow of blood is increased due to a decrease in vascular resistance, the urinary bladder is a hollow elastic organ that functions as the body's urine storage tank, The pupil is a hole located in the center of the iris of the eye.

BMR stands for Basal metabolic rate, and it refers to number of calories that human body needs to function is called basal metabolic rate.

Adrenal gland is located on top of each kidney that releases adrenaline and the steroids aldosterone and cortisol.

It coordinates and regulates muscular activity.

Plant growth regulators function as chemical messengers for intercellular communication . There are currently five recognized groups of plant hormones: auxins, gibberellins, cytokinins, abscisic acid (ABA) and ethylene. They work together coordinating the growth and development of cells.

Abscisic acid is a plant hormone that acts as growth retardator for plant by reversing the effect of auxin.

Parathyroid gland is four lobed,this gland is present in the neck region.

Auxins are a powerful growth hormone produced naturally by plants. They are found in shoot and root tips and promote cell division, stem and root growth. 

The main function of auxin is to help plants grow. Auxin stimulates plant cells to elongate, and the apical meristem of a plant is one of the main places that auxin is produced.

Sympathetic and parasympathetic both are the components of automonic nervous system (ANS).

Thymus gland is larger in new born child which becomes smaller  with an increasing age.The thymus gland is a soft, flattened, pinkish-grey organ found in the upper chest under the breastbone. 

The meninges refer to the membranous coverings of the brain and spinal cord.

Hormones known as posterior pituitary hormones are synthesized by the hypothalamus, and include oxytocin and antidiuretic hormone.

spinal cord is protected by a bony structure called vertebral column, it present in dorsal surface.

Fore brain contains cerebrum which in turn responsible for memory, will and intelligence of an individual.

It is responsible for precision of voluntary actions and maintaining the posture and balance of the body. 

Calcitonin hormone maintains the calcium and phosphate levels in the blood. It provides strong bones and healthy teeth.

Growth hormone (GH) deficiency cause dwarfism.This hormone is produced in the pituitary gland, which is located at the base of brain.

Growth harmone produce by pituitary gland and when it acts on some tissues directly it cause gorilla or growth harmone disorder.