“Support and Movement” in the body involve the skeletal and muscular systems, working together to provide structure, stability, and enable physical movement.
Class 12 biology chapter 2
In skletal muscle, calcium facilitates contraction by binding to: Actin
The sites where nerve impulse is transmitted from the nerve endings to the skeleton muscle cell membranes are the: Neucromuscular junctions
Why is there no glucose present in the filterate in the distal tubule of a nephron: He is actively absorb by hte proximal tubule cells
Each type of the principal type of sensation that we can experience e.g pain touch sight sound and so for this called a modality of: Sensation
In amoeba movement takes place by means of: Pseudopodium
Cortisol brings about an increase in blood glucose level mainly by its production from protein and by: Insulin
The funnction of the tubules in muscle contraction is to: Make the action potential deep into the muscle cells
Osteoblast and osteoclasts continue to migrate inward multiply rapidly and gradually convert the soft calius into: Jolly callus
Arthritis covers over 100 different types of inflammatory or degenerative diseases that damage the: Joints
The most toxic substance routinely found in the blood are metabolities of what type of molecule: Proteins
The organic portion of bones matrix is important in providing all but: Tensile strength
Cytokinins delay the aging of fresh leaf crops such as cabbage and lettuce as well as keeping flowers: Fresh
An animal that worms itself mainly by absorping from its surroundings is known as: Ectotherm
Which of the following NOT dispose off a type of waste directly to the environment: Circulatory system
The process during which potassium and hydrogen ions and some toxic substances are put into urine is called: Tubular secretion
The process that normally exerts the greatest control over the water balance of an individual is: Kidney function
Buoyancy in the water is maintained by a specialized structure in bony fish called: Swim bladder
Fibroblasts and osteoblasts migrate into the fracture site and begin to construct: Bone
Which of the following is the last structure that urine passes through duration its excretion from the body: Urethra
Kidney health is described in terms of: Rate of filteration
Mammals including human maintain their high body temperature within a narrow range of about: 36-38oC
Which is the most important mechanism for water loss from the body: Excretiong in urine
Myoglobin has a special function in muscle tissue: It holds a reserve supply of oxygen in the muscle
Each muscle fibre contains a large number of myofibrils having a diameter of: 1 – 2 mm
At the distal end the femur forms knee joint with the proximal end of two parallel bones called: Tibia and fibula
Innate behaviour is a collection of responses that are predetermined by the: Inheritance
A hurdened outer surface to which internal muscles can be attached is: Exoskeleton
Amphibians wriggle along the belly on the gound with the help of segmentally arranged: Muscles
Which of the following statements conserning the role of Ca+2 inthe contraction of skeletal muscle is correct: A rise in inter cellular Ca+2 allows actin to interact with myosin
Who was the first to propose an objective definition of instincts in terms of animal behaviour: Darwin
The disorder in which bones are porous and thin but bone composition normal is: Osteoporosis
Antidiuretic hormone is also called: Vasopressin
The remodeling of bone is a function of which cells: Osteoblasts and osteoclasts
The simplest form of learning is: Habituation
Cardiac muscles are muscles of the: Heart
Abscisic acid can be sprayed on tee crops to regulate: Fruit drop
Frogs and toads also walk and hop on land due to strong: Hindlimbs
Biorhythms are called circadian which means about one day so they are also called: Diurnal rhythms
A cluster of neuron’s cell bodies form: Ganglia
In case of overheating the body temperature is regulated by: More sweating and more urination
Shifts in water-solute balance are managed primarily by: The urinary system
Excess MSH is secreted in: Addison’s disease
Digitigrade mammals tend to walk on their: Digits
The main transmitter for synapses that lie outside the central nervous system is: Acetylcholine
In myelinated neurons the impulse jumps from node to node (node of Ranvier) This is called: Saltatory impulse
The concentrations of cell bodies of neuron are: Ganglia
Nitrogen waste which is highly toxic and dissolves quickly in body fluids is: Ammonia
Mutualism is a type of: Symbiosis
Secondary growth leads to an increase in the diameter if the: Stem and root
The biome, which has very fertile soil, rich in organic matter with maximum water holding capacity is: Temperate deciduous forest
Full cell cycle in yeast cells has length of: 90 minutes
At cytokinesis in plants a membrane structure phragmoplast is formed from vesicles which originate from: Golgi complex
In 1999,transgenic crops were planted world wide on more than: 70 millions areas
The animals that lay shelled eggs to protect the developing embryo are called: Oviparous
A collection of bacterial and phage viruses clones containing a particular segment of DNA from the source cell is called: Genomic library
Important : Review all previous years’ 12 class past papers for comprehensive practice and better exam preparation.