ЁЯРТ Structural Organisation of Animals-1 ЁЯРТ

-

Section A-рооாрогро╡ро░்роХро│் роЪро░ிропாрой рокродிро▓ை родேро░்рои்родெроЯுроХ்роХро╡ுроо்

Structural Organisation of Animals


a ) Anterior sucker     b ) Parapodia     c ) Setae     d ) None of the above


a ) Metameres (somites)     b ) Proglottids     c ) Strobila     d ) All the above


a) Excretory system     b) Nervous system     c) Respiratory system     d) Reproductive system


a) Mouth     b) Buccal Cavity     c) Pharynx     d) Crop


a) 23 segments     b) 33 segments     c) 38 segments     d) 30 segments


a) Cold blooded     b) Warm blooded     c) Poikilothermic     d) All the above


a) Viviparous     b) Oviparous     c) Ovoviviparous     d) All the above


a. mascula     b. cortex     c. nephrons     d. epididymis


a. 10     b. 16     c. 14     d. 12


a. epididymis     b. wasdefrens     c. testis     d. ejaculatory duct


рокிро░ிро╡ு B-рооாрогро╡ро░்роХро│் роЪро░ிропாрой рокродிро▓ை родேро░்рои்родெроЯுроХ்роХро╡ுроо்

Important formulas to remember in maths


a ) `\frac{1}{2}` b x h     b ) `\frac{Hc}{G}`    c ) `\frac{1}{2}` a x a     d ) `\pi`(r)2


a ) `\frac{x}{y}`     b ) `\sqrt[3]{x+y}`    c ) `\(a + b + c)`    d ) `\sqrt(a + b + c)`


a )`\pi r^2`     b )`\2 pi r `    c )`\frac{1}{2}` b x h     d )`\2 pi` r x h


a ) r x r     b ) `\sqrt(a + b + c)`     c ) `\pi r `2     d ) `\2 pi r`


a ) `\pi`a x b     b ) `\2 pi r`    c ) `\pi` r1 x r2     d ) `\2 pi r h`


a ) `\frac{1}{3} pi r^2h` b ) `\pi` r1 x r2     c ) `\2pi sqrtfrac(a^2+b^2)2`    d ) None of the above


a ) `\a^2`    b ) area x area     c ) side x side     d ) all the above


a )`\3   frac(sqrt(3)) {2} a^2`     b ) `\4 frac sqrt(3) {2} x^2`     c ) `\2 frac sqrt(3) {2} x^2`     d ) `\5 frac sqrt(3) {2} x^2`


a )`\(a+b)(a^2−ab+b^2)`     b ) `\(a+b)(a^2+ab+b^2)`     c )`\(a+a)(a^2−ab+b^2)`     d ) Non of the above


a ) (a + b) (a - b)     b ) `\(a + b)^2`     c ) `\(a^2+ b^2)`     d ) non of the above


a ) `\a^2 + b^2 + 2ab`     b ) `\a^2+b^2-2ab`     c ) `\b^2+c^2-2ab`     d ) `\(a + b) (a - b)`


a ) `\a^2 + b^2 + 2ab`     b ) `\a^2 + b^2 - 2ab`     c ) `\(a + b) (a - b)`     d ) Non of the above

 

Structural Organisation of Animals

Some priciples related to biology

The brain of rabbit is situated in the cranial cavity and covered by three membaranes called an outer duramater , an inner piamater and middle arachnoid membranes. The brain is divided in to forebrain ( prosencephalon), midbrain (mesencephalon) and hindbrain (rhombencephalon)

Forebrain consists of a pair of olfactory lobes, cerebral hemispheres and diencephalon. The right and left cerebral hemispheres are connected by transverse band of nerve tissue called corpus callosum.

The midbrain includes the optic lobes. The hindbrain consists of the cerebellum, pons varolii and medulla oblongata.

The male reproductive system of rabbit consists of a pair of testes which are ovoid in shape

Testes are enclosed by scrotal sacs in the abdominal cavity

Each testis consists of numerous fine tubules called seminiferous tubules

This network of tubules lead into a coiled tubule called epididymis, which lead into the sperm duct called vas deferens

The vas deferens join in the the urethra just below the urinary bladder. The urethra runs backward and passess into the penis.

There are three accessory glands namely Prostate gland, cowper's gland and perineal gland. Their secretions are involved in reproduction.

Rabbit has two sets of teeth. The existence of two sets of teeth in the life of an animal is called diphyodont dentition. The types of teeth are milk teeth (young ones) and permanent teeth (in adults)

In rabbit the teeth are of different types. Hence the dentition is called heterodont. There are four kinds of teeth in mammals viz. The incisors (I), canines (C), Premolars (PM) and Molars (M)

Dental formula is `\(Ifrac{2}{I}`,     `\C frac{0} {0}`,     `\ PM frac {3}{2}`,    `\Mfrac {3} {3})`, In rabbit which is written as `\frac{2033}{1023}`. Cannines are absent. The gap between the incisors and permolar is called diastema. It helps in mastication and chewing of food in herbivorous animals.

The digestive sytem includes the alimentary canal and the associated digestive glands

The alimentary canal consists of mounth, buccal cavity , pharynx, oesophagus stomach, small intestine, caecum, large intestine and anus.

Mouth is transverse slit bounded by upper and lower lips. It leads into the buccal cavity. The floor of the buccal cavity is occupied by a muscular tongue. Jaws bear teeth.

The buccal cavity leads into the oesophagus through the pharynx

Oesophagus opens into the stomach followed by samll instestine

Caecum is thin walled sac present at the junction of small intestine and large intestine. It contains bacteria that helps in digestion of cellulose

The samll intestine opens into the large intestine which has colon and rectum

The rectum finally opens outside by the anus.

Digestive glands 1) the digestive glands are salivery glands , gastric glands, liver, pancreas and intestinal glands

2)The secretion of digestive glands help in digestion of food in the alimentary canal.

The central nervous system of leech consists of a nerve ring and a paired ventral nerver cord. The nerve ring sourrounds the pharynx and is formed of suprapharyngeal ganglion (brain) , Circumpharyngeal connective and subpharyngeal ganglion. The subpharyngeal ganglion lies below the pharynx and formed by fusion of four pairs of ganglia

рокுродிроп роЙропிро░ிропро▓் - рокுродிроп ро╡ிро│ைропாроЯ்роЯு
  1. Leeches do not have true blood vessels

  2. The coelomic fluid of leech lacks haemoglobin

  3. Mammals are less developed group of animals in the animal kingdom

  4. Overy of leech is coiled ribbon shaped structure

  5. Internal fertilization occurs in leech

  6. Parapodia and setae are locomotory organs of leech

  7. Heart of rabbit is three chambered

  8. Cowper's gland and perineal gland are seen in male and female rabbits

  9. The uterus of a rabbit is divided into two.

  10. Leech is a hermaphrodite