Cniderians

Advantages of Metagenesis in Cnidaria

huge number of Cnidarian colonies are polymorphic and exhibit alternation of generations. This changes of generation or metagenesis confers tremendous advantages for the specific species.

a) Proximate (immediate) Benefits

i) Metagenesis gives alternative method of reproduction, asexual and sexual, in case either one fails to work.

ii) Sessile (attached to the substratum) forms such as Obelia produce free moving medusae as part of metagenesis. This allows wider distribution of species, which in turn improves the chances of exploring and finding better shelter, food and environment.

 iii) Metagenetic animals escape adverse climatic conditions through changing from one body form to the other body form.

b) Ultimate Benefits

Continuous asexual reproduction causes genetic homogeneity. To avoid this, alternate sexual forms permit cross fertilization mixing of genetic material and variation which is good for species survival and evolution. In addition to Cnidarians, polymorphism is clearly seen between certain, orders of the Class Insecta of Phylum Arthropods.

Class 10th new students batch

Those who attend their first batch at TRANSITION.

At Sunday there is a recovery batch at 10 am. Repeat telecast at 11.30 am. Come only once.

All questions are of 2 marks.

Write three differences between different type of blood vessels
Why arteries have thick walls.
Which artery carries deoxygenated blood in our body
Which vein carry oxygenated blood in our body.
What is the location of kidney in our body.
Define the term excretion.
Which is the chief excretory product in our body.
Which is the unit of excretory system.
What are the different components of nephron.
What are the 3 steps of urine formation.
out of 3 blood vessels arteries veins and capillaries which have valves and why

Class 9th test

All questions are compulsory. Each question is of 2 marks.

1.What is the least possible temperature recorded in laboratory .
2.Which is the SI unit of temperature.
3.What is the formula to convert celsius into farenheit.
4.Convert 60 celsius into farenheit.
5.Convert 60 farenheit into celsius.
6.What is the temperature at which celsius and farenheit reads same reading.
7.What is the temperature at which celsius reads double to that of farenheit.
8.What is the temperature at which farenheit reads double to that of celsius.
9.Convert 27 celsius into Kelvin.
10.Convert 227 Kelvin into celsius.
11.What are the 5 states of matter.
12.Write any 2 differences between 3 states of matter.
13.Write any 3 characteristics of particles of matter.
14.Define diffusion. Which state of matter show fastest diffusion.
15. Define kinetic energy and which state of particle show fastest kinetic energy.

Note:
As we take test on Saturday, so there is a batch on Sunday at 4 PM Or 5.30 PM. Student can come at one of the possible timing according to their convenience.

Previous and today's answer sheet given combinly on Sunday.

Thanks

Class 10th

1. Respiration is an (a) anabolic process (b) catabolic process (c) none (d) both

2. Which of the following comes first while deglutition :
(A) larynx (b) Phayrnx (c) bronchi (d) Alveoli

3. Alveoli is the finger like structure found in
(A) larynx (b) pharynx (c) bronchi (d) lungs

4. Breathing is:
(A) inhalation (b) exhalation (c) both (d) None

5. Breathing centre located in which part of brain
( A) Medulla oblongata (b) cerebellum (c) vermis (d) None

6.  Nutrition includes the study of: 
(A) the organism's food   (B) process of digestion (C) the way an organism obtains food  (D)all of the above

7.       Amoeba feeds with the help of:
(A) tentacles (B) pseudopodia (C)food vacuole (D)none of the above

8.       Parotid gland is a /an:
(A) gastric gland (B) intestinal gland (C) salivary gland (D) none of the above

9.       An enzyme that acts only in an acidic medium is:
(A) pepsin (B) trypsin (C) rennin (D) amylase

10.       A non-enzyme protein present in the saliva is:
(A) heparin (B) mucin (C) ptyalin (D) none of the above

11.        Absorption is maximum in the small intestine because of: 
(A) the presence of villi (B) its length (C) its thin walls (D) all the above

12.       Pyloric valve is present in the: 
(A) heart (B) liver (C) stomach (D) intestine

13.       Mastication is :
(A) digestion (B) absorption (C) assimilation (D) chewing

14.   In the mouth the food is formed into :
(A) chyme (B) chyle (C) bolus (D) pellets

15.   Appendix is a part of:
(A) ileum (B) duodenum (C) caecum (D) colon

16.   Bile juice is secreted by :
(A) liver (B) pancreas (C) salivary gland (D) intestine

17.   Bile juice is: 
(A) alkaline (B) acidic (C) neutral (D) near acidic

18.   The three portions of the small intestine, in the correct order, are :
(A) caecum, colon, rectum (B) ileum, duodenum, jejunum (C) colon, caecum, rectum (D) duodenum, jejunum, ileum

19.   Which of the following are chiefly digested in the stomach? 
(A) carbohydrates (B) proteins (C) fats (D) lipids

20.   Large intestine in man mainly carries out :
(A) digestion of fats (B) absorption (C) assimilation (D) digestion of carbohydrates

21.   The part of the digestive system where no digestion takes place is: 
(A) mouth (B) oesophagus (C) ileum (D) stomach

22.   The largest gland of the body is: 
(A) parotid gland (B) liver (C) pancreas (D) submandibular gland

23.   The most common substrate of respiration is :
(A) fats (B) amino acids (C) glucose (D) sucrose

24.   Lowering of diaphragm results in :
(A) inspiration (B) expiration (C) it is not related to either (D) digestion

25.   The surface area of the gills increase due to the presence of :
(A) lamellae (B) alveoli (C) arches (D) slits

26.   Production of sound in man is due to the presence of : 
(A) cartilage rings (B) cilia (C) goblet cells (D) vocal cords

29.   Respiratory surface should be :
(A) permeable (B) thin (C) richly supplied with blood vessels (D) all the above

30.   The part of the respiratory tract that is responsible for keeping it healthy is :
(A) trachea (B) bronchi (C) nasal cavity (D) all the above

31.   Which of the following are the stages of respiration in the correct order? 
(A) gaseous transport, breathing, tissue respiration and cellular respiration 
(B) breathing, gaseous transport, tissue respiration and cellular respiration 
(C) breathing, gaseous transport, cellular respiration and tissue respiration 
(D) breathing, tissue respiration, cellular respiration and gaseous transport

32.   Epiglottis guards the entrance of :
(A) pharynx (B) wind pipe (C) bronchus (D) lungs

33.   The expired air differs from the inspired air in the following respects: 
(A) it contains more carbon dioxide (B) it contains less oxygen 
(C) it contains more water vapour (D) all the above

34.  Which structure separates thorax from abdomen? 
(A) lungs (B) heart (C) diaphragm (D) rib cage

35.   Which area of the brain controls the respiratory movements? 
(A) cerebrum (B) cerebellum (C) medulla oblongata (d) None

36.   Blood is composed of: 
(A) plasma and red blood cells (B) plasma and formed elements (C) red and white blood cells (D) red blood cells, white blood cells and platelets

37.   : __________ carries oxygenated blood. 
(A) pulmonary artery (B) hepatic portal vein (C) pulmonary vein (D) all of the above

38.   The threads formed during clotting are made up of :
(A) thrombin (B) prothrombin (C) fibrinogen (D) fibrin

39.   The double membraned structure surrounding the heart is called :
(A) plasmalemma (B) pleural membrane (C) tonoplast (D) pericardium

40.   An example of lymph gland is: 
(A) spleen (B) liver (C) tonsil (D) thyroid

41.   Human circulatory system is called double circulation because of :
(A) systemic and hepatic portal system (B) hepatic portal and pulmonary system 
(C) systemic and pulmonary circulation (D) none

42.   Thick muscular walls are present in :
(A) arteries (B) arterioles (C) veins (D) venules

43.   Diapedesis is shown by :
(A) RBC (B) WBC (C) platelets (D) a,b and c

44.   The normal blood pressure in man is :
(A) 80/120 mm Hg (B) 120/80 mm Hg (C) 120/100 mm Hg (D) 100/80 mm Hg

45.   The opening between the right auricle and the right ventricle is guarded by the :
(A) tricuspid valve (B) bicuspid valve (C) semi-lunar valve (D) none

46.   The blood vessel carrying blood from heart to the lungs is called :
(A) carotid artery (B) carotid vein (C) pulmonary artery (D) pulmonary vein

47.   Valves are present in :
(A) arteries (B) arterioles (C) veins (D) capillaries

48.   Deoxygenated blood is received by the :
(A) left auricle (B) right auricle (C) left ventricle (D) right ventricle

49.   Mitral valve is the other name for : 
(A) semilunar valve (B) bicuspid valve (C) tricuspid valve (D) venous valves

50.   Lacteals in the intestine take up :
(A) digested starch (B) digested fats (C) digested proteins (D) glucose

Test class 10th

Objective test

1.

Test class 9th

Suprise Test

Sorry students, due to extreme emergency , I have to go outside the home.

So all of you are requested to attempt the test paper.

All questions are of 2 marks.
1. Write the name of 5 states of matter.
2.  Write differences between solid liquid and gases.
3.  What what do you mean by kinetic energy of a molecule.
4.  Define density and write it's SI unit.
5.  Intermolecular force of attraction is maximum in :
(A) solid (B) Liquid (c) Gas (D) None
6. Intermolecular distance is maximum in:
(A) Solid (B) Liquid (c) Gas (D) None .
7. Density is maximum for:
(A) Solid (B) Liquid (c) Gas (D) None
8. Compressibility is maximum for:
(A) Solid (B) Liquid (c) Gas (D) Plasma
9. Rigidity is minimum for :
A) Solid (B) Liquid (c) Gas (D) None.
10. What is the meaning of sublimation ?

All questions are of 4 marks.
11. What do you mean by sublime substances ? Write name any 2 sublime substances.
12. Define the following term
(A) Melting point
(B) freezing point
(C) condensation
(D) Boiling point.

13. What do you mean by diffusion. Out of solid , liquid and gases , which substance diffuses faster, and why ?

14. Pick out 5 matter from the following:
Chair, table, sense of smell, hate ,love , sun, air , mud.

15. What are the characteristics of particles of matter ( any 2)
Why naphtelene tablets disappear after few days.

1. What do you mean by digestion. explain it.