SSC Sciences Paper 2 Model Questions and Answers

1. What is Apical dominance?
Ans: The phenomenon of the suppression of the growth of lateral buds by the terminal bud is known as “Apical dominance”

2. How trachea is prevented from collapsing?
Ans: The walls of trachea are supported by several ‘c’ shaped cartilaginous rings. They prevent the trachea from collapsing and closing.

3. What is a mixed gland? Give an example.
Ans: The gland which acts as an exocrine as well as endocrine gland is called a mixed gland. e.g.: Pancreas

4. Why there is more pressure in arteries than in veins.
Ans: The arteries receive the blood from heart. So, blood pressure is more in arteries than in veins.

5. What are ‘gyri’ and ‘sulci’? What is the advantage of these structures?
Ans: The outer portion of cerebral hemisphere is called cerebral cortex. It consists of several ridges called ‘gyri’ and the grooves called ‘sulci’. They increase the surface area of the cortex so that it can accommodate more number of neurons.

6. What is blood transfusion?
Ans: Administering of blood from one person to another person through vein is called blood transfusion.

7. What is “Heart Attack”?
Ans: There are a pair of coronary arteries. They carry oxygenated blood to the heart muscles. In some people, the coronary arteries get blocked with age. When this happens muscle cells in the heart do not recieve oxygenated blood and stop working. This is called heart attack.

8. What is an electron acceptor? Give some examples.
Ans: The substance which accepts the electrons is called an electron acceptor.
e.g.: (1) Nicotinamide Adenine Dinucleotide (NAD)
(2) Nicotinamide Adenine Dinucleotide Phosphate (NADP)
(3) Cytochromes
(4) Plasto quinones
(5) Fermredoxins etc

9. What are the differences between a dendrite and an axon?
Ans:
Dendrite – Axon
1. Dendrites are short and branched. 1. Axon is long and unbranched.
2. One to thousand of dendrites are 2. Only one axon is
present in each neuron. present in each neuron.
3. Dendrites arise from all the 3. Axon arise from one
corners of neuron. corner of the neuron.
4. They transmit information from 4. They receive information and
one cell to cell or effector organ transmit it to the cell body.

10. What are the functions of cytokinins?
Ans: 1. Cytokinins are a group of substances produced by plants and are capable of stimulating cell division and cell elongation.
2. These substances are produced in actively growing tissues of the plants like roots, embryos and developing fruits.
3. In mature plants cytokinins are made in the roots and transported to the shoots.
4. Cytokinins promote cell division.
5. Cytokinins have the ability to delay the process of aging in leaves.
6. Cytokinins prolong the life of fresh leaf crops like cabbage, spinach etc.
7. They are useful in keeping the flowers fresh.
8. Sometimes they are also used to break the dormancy of seeds.

SSC Public Exams General Science Paper 2 – Model Paper

SSC Public Examinations – General Sciences (NS) Model Paper
General Science (Biology) Paper-II
Time : 2 1/2 Hrs. PART – A and B Max. Marks: 50

Instructions:

1. Answer the questions under part – A on a separate answer book.
2. Write the answers to the questions under part – B on the question paper itself and attach it to the

answer book of part – A.

Time: 2 Hours PART-A Marks:35
SECTION – I (4 × 1 = 4)

Note: 1) Answer any FOUR questions from the following. 2) Each question carries ONE mark.

1. What is Apical dominance?
2. How trachea is prevented from collapsing?
3. What is a mixed gland? Give an example.
4. Why there is more pressure in arteries than in veins.
5. What are ‘gyri’ and ‘sulci’? What is the advantage of these structures?
6. What is blood transfusion?

SECTION – II (5 × 2 = 10)

Note: 1) Answer any FIVE questions, choosing at least TWO from each Grop A and B.
2) Each question carries TWO marks.

Group – A

7. What is ‘Heart Attack’?
8. What is an electron acceptor? Give some examples.
9. What are the differences between a dendrite and and axon?
10. What are the functions of cytokinins?

Group – B

11. Define Photosynthesis. Write an equation for Photosynthesis showing all the requirements and the

products formed.
12. Write an account on diabetes mellitus.
13. Write short notes on sinus venosus.
14. What are respiratory substrates? give examples.

SECTION – III 4 × 4 = 16

Note: 1) Answer any FOUR questions, choosing at least TWO from each group A and B.
2) Each question carries FOUR marks.

Group – A

15. Write about Tracheal system of respiration in cockroach.
16. Describe the different blood groups in man.
17. What is the importance of pituitary gland in the body? Mention the hormones and their functions of this

gland.
18. What are auxins? How do they affect plant growth.

Group – B

19. How can you prove that carbon dioxide is essential for Photosynthesis.
20. Describe the structure of cerebrum.
21. What are the differences betwen RBC and WBC?
22. Bring out the differences between right ventricle and left venrticle.

SECTION – IV 1 × 5 = 5
Note: 1) Answer any ONE question. 2) This question carries FIVE marks.

23. Draw a neat labelled diagram of transverse section of a leaf.
24. Draw the diagram showing reflex arc and label the parts.

Time: 30 Minutes PART – B Marks: 15
Note: 1. Answer ALL the questions. 2. Each question carries 1/2 mark.
3. Marks will not be awarded in case of any over- writing, re-writing or erased answers.

I. Answer the following by choosing correct answer from the four answers given (A, B, C, D) write the

Capital letter of the correct answer in brackets 10 × 1 / 2 = 5

1. In plants, exchange of gases take place through
A) Stomata B) Palisade tissue C) Spongy tissue D) Mid rib

2. Karl Landsteiner discovered
A) Red Blood Corpuscles B) Blood vessels C) Blood groups D) Proteins in blood

3. The rate of respiration per minute in a new born baby
A) 18 times B) 32 times C) 26 times D) 16 times

4. In diseases like Polio, the cells that get destroyed by virus, are
A) Monocytes B) Erythrocytes C) Motor neurons D) sensory neurons

5. Conversion of Glycogen to Glucose is stimulated by
A) Insulin B) cortisol C) Glucagon D) Progesterone

6. Dicotyledonous weeds are destroyed by a chemical called
A) IAA B) 2, 4 -D C) ABA D) NAA

7. The box like structure made up of bones which give protection to brain
A) Thoracic cavity B) Abdominal cavity C) Pericardial cavity D) Cranium

8. Plants are green because they
A) reflect green light B) refract green light C) absorb green light D) do not absorb UV light

9. The substance that prevents clotting of blood in blood vessels is
A) Haemoglobin B) heparin C) thyroxin D) pepsin

10. Operculum Occurs in
A) bony fishes B) frog C) cockroach D) Cartilagenous fishes

II. Fill in the blanks with suitable answers. 10 × 1/ 2 = 5

11. Our standing in attention when we hear our National Anthem is a ………..
12. The first stage of respiration is called ……….
13. In women ………. play a major role in respiratory movements.
14. Normal blood pressure of human is ……..
15. People with AB blood group are called ……..
16. Fall of leaves is promoted by a hormone called ………..
17. The granules present in the cyton are called ……… granules
18. The cranial nerve that controlls the heart beat is called ……… nerve.
19. The structural and functional unit of a reflex action is called ……….
20. The hormone that helps in the formation of placenta is called ………..

III. Match the following by writing the letter of the correct answer in the brackets,
Choosing from the group B. 5 × 1 / 2 = 2 1/ 2

i) Group – A Group – B

21. Crab ( ) A. Light reactions
22. Sphygmomanometer ( ) B. Starch Test
23. Mitochondria ( ) C. Fluid tissue
24. Melvin Calvin ( ) D. Blue colour blood
25. Iodine ( ) E. Blood pressure
F. Dark reactions
G. Power houses

ii. Group – A Group – B

26. A three chambered heart ( ) A) Mammals
27. Sinuses ( ) B) 12 Pairs of nerves
28. Spinal nerves ( ) C) ‘O’ group
29. Blood group without ( ) D) Frog AB antigens
30. A four chambered heart ( ) E) 31 pairs of nerves
F) Cockroach
G) ‘AB’ group

PART-B ANSWERS:

1-A; 2-C; 3-B; 4-C; 5-C; 6-B; 7-D; 8-A; 9-B;
10-A; 11. Conditioned reflex 12. Glycolysis
13. Ribs 14. 120/80 15. Universal recipients
16. Abscisic acid (ABA) 17. Nissle 18. Vagus
19. Reflex arc 20. Progesterone 21-D;
22-E; 23-G; 24-F; 25-B; 26-D; 27-F; 28-E; 29-C; 30-A.

error: Content is protected !!