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Answers - Bio.

posted Sep 16, 2015, 12:30 AM by Upali Salpadoru   [ updated Sep 7, 2017, 12:32 PM ]
 Biology
  Assessing achievement
                       Below 30% . U need to study the lesson again preferably with                        a helper.
                       30 - 49    Achieved.         50 - 69    Credit.
                       70 - 89    Distinction.       90 - 100  Brilliant.
A
B
  • Bacteria
     1.0
       2.0    2.0 Answers-          1.  c,   2.  d,   3. d.   4. a,

         3.0    Complete this chart.


Part

Function

1.  Capsule

Protection

2.  Cell wall

Protection

3.  Plasma membrane.

Controls intake and exit of materials.

4.  Nucleoid

Carries genetic material

5.  Flagella

Helps locomotion.

        
          4.0
      1. Bacteria are used in making cheese and yogurt.       U.

2 Some bacteria spoils food.                                           B

3 Some Bacteria can live in hot springs.                        T

4 Bacteria produce eggs.                                                 F

5 Some bacteria cause disease.                                       H

6 Bacteria cause cold and flu.                                         F

7 Bacteria decays dead plants and animals.                   U

8 Bacteria undergo binary fission.                                 T

9 Actions of bacteria are controlled by a nucleus.         F

10. Some bacteria can convert gaseous Nitrogen to Nitrates.  U.




 

C

D

       Digestive System


Answers

Marks

1.0              1.1  d.  1.2 a. 1.3 b. 1.4 b.  1.5 c.

2.0

2.1  Increases surface area helping the absorption of nutrients.

2.2  Bile.

2.3  Relaxing of Pyloric sphincter muscles.

2.4  They can assist chemical changes without getting consumed.

2.5  When different muscles contract and relax the stomach gets constricted in different ways.            This helps the churning of food.

25




2


3.0


Answers

Marks

3.1.A  1.Food in. 2.Pancreatic juice in. 3. Gall bladder. 4.Bile duct / bile in. 5. Duodenum.

3.1.B.  1. Esophagus. 2. Cardiac sphincter muscles. 3. Pyloric sphincter muscles. 4. Pancreas.  5. Small intestine / Duodenum.

3.2 A.  Trypsin, Amylase,Lipase.

3.2 B.  Pepsin, Renin in children.

3.3 A. Storing bile.

3.3 B. To allow food to enter the stomach and close while it is contracting.

2x5



2x5

3

2

2

3 =30


4.0

Answers

Marks

4.1 A. Saliva,  4.1 B. Ptyalin/Amylase.  4.1 C  Converts starch to sugar.

3x3

4.2 A  Gastric juice.  4.2 B. Pepsin and Renin in children.

                             4.2 C. Pepsin converts proteins to peptones.

                                       Renin curdles milk.   (One answer sufficient)  

3x3

4.3 A  not reqd.    4.3 B  Enterokinase.  4.3 C .Activates trypsinogen to trypsin.

2 =20




E

F

G

Genetics - l.

Answers

1.0 .  1. 23,  2. 23,  3. 2.  4. 46,  5. 23.

2.0    1.Pollen,  2. Ovule,  3. Fertilization. 4. Zygote. 5. Sperm, 6. Egg.  7.Genetic code.  8. Gene.9. Mutations. 10. Genetics.

3.0  1.Polymer.  2.Nucleotide, 3. Nucleus 4.Invisible.5.Chromosomes. 6.phosphate sugar. 7.base pairs, 8.Four.

4.0.   1, Ribose sugar,  2. Phosphate, 3. Base pair, 4. A, 5. T,  6. A, 7. C.   8. G.


Genetics - ll.


Q.1.0

1.Genotype : 2.Phenotype 3.Alleles 4. Homozygous 5.Heterozygous:6.Continuous traits. 7. Discrete traits. 8.Protein synthesis. 9.Transcription. 10. Translation.

Q.2.0

  1. D,  2. C 3. B, 4.-A, 5. A.

Q. 3.0

  1. A, B,  2. C,D.E  3. ,  4. C, D,  5.A   6.F,  7. A ,B, 8. B,

Q.4.0


No.

1 example

2

3

4

5

6

7

8

Genotype

B w

B w

B w

Bw

B B

B w

B w

W w

Phenotype.

black

black

black

black

black

black

black

white

Ratio

Black: white

F1 Hybrid.

1:0

 F2 Hybrid.

3:1

Q.5.0

1. mRNA. 2. 20.  3. Helicase. 4. - Four  5.- Repressor molecule.


H

I

J

K

L

M

N

O

P

Plant Kingdom.

Q.1.0

 FloweringNon flowering Others 
Grass
Tea.
Kiwi
Ficus,
Centella asiatica. 
Cactus

 Silver fern.
 X'mas tree.
 Bracken,
 Fur tree
 Spruce.
 Moss
Yeast
Mush room
Bacteria.

 Q.2.0.

DicotsMonocots  Others 
 Sun flower
 Bean
 Cashew nut
 Lemon
 Onion
 Bamboo.
 Lily.
 Orchid
Pineapple
 Cyca
Q.3.0

Q.4.0




Q

R

  •  Respiration.
 1.0   1.air, increasing.  2. contraction, reduces, 3.trachea, alveoli. 4. capillaries, combine. 5. CO2. 2x10 =20
 2.o   1.Trachea.  2. Bronchus, 3. lungs. 4. diaphragm, 5. sternum. 4 x5 = 20
 3.0   1. CO2.,2.Hemoglobin, 3.Glucose + Oxygen. 4.Water 5.Plasma or water or haemoglobin.  6. Surfactant.  5 x6 - 30
 4.0    1. Exhaling.  2.     Diffusion. 3.Oxidation.  4 .4.     Respiration. 5.5.     Transport
                
6.     Photosynthesis 
  5x6 = 30


S
T
U
V
  •  Vision 
 AnswerMarks 
 1.0. 1.      Cornea,   2.  Sclera.  3. Iris,  4. Choroid, 5. Lens, 6. Retina, 7. Fovea, 8.Aqeous humour, 9. Blind spot, 10. Optic nerve 3 X 10 = 30
 2.0   1. Lens.  2.Supplies blood to retina and prevent scattering of light.  3. Cilary muscles. 4. Optic nerve. 5. Fovea.  6. Maintains the shape of the eye. Offers protection. 7. Retina, 8. Blind spot.  9.  It keeps the retina pressed against the choroid. 10/ Cones. 3 x 10 = 30
 3.0.  
 1.   D,  2. A.  3. B.   4. B.   5. A   6.- D.   7.- C.  8.- D  9.- C.  10.- A


 4 X 10 = 40



              
           
           
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