AP 10th Class Biology Model Paper Set 7 with Solutions

Teachers often recommend practicing with AP 10th Class Biology Model Papers Set 7 to enhance exam readiness.

AP SSC Biology Model Paper Set 7 with Solutions

Time : 2.00 hours
Max.Marks : 50

Instructions :

1. Question paper consists of 4 sections and 17 questions.
2. Internal choice is available only for Q.no. 12 in section III and for all the questions in section IV.
3. In the duration of 2 hours, 15 minutes of time is allotted to read the question paper.
4. All answers shall be written in the answer booklet only.
5. Answers shall be written neatly and legibly.

SECTION – I
(6 × 1 = 6 M)

Note :

1. Answer all the questions.
2. Each question carries 1 mark.

Question 1.
Read the sentence, find the error in the underlined words. Rewrite it correctly.

Government of India fixed the legal marriage age of boys 18 years and girls 21 years.
Answer:
Boys 21 years, girls 18 years

Question 2.
Fill the boxes in the table.

Gas	% in Inhaled air T	% in exhaled air
2 – ?	2.1	16
3 – ?	0.03	4.4

Answer:
2. Oxygen
3. CO₂

Question 4.
Expand ESRD:
Answer:
End Stage of Renal Disease

Question 5.
I am a Hormone. I help to promote cell division and opening of stomata. Who am I?
Answer:
Gibberellin.

Question 6.
Observe the picture and identify the part ‘X’.

Answer:
Acrosome.

SECTION – II
(4 × 2 = 8 M)

Note :

1. Answer all the questions.
2. Each question carries 2 marks.

Question 7.
What are enzymes and how do they help in the process of digestion?
Answer:

1. Enzymes are biochemical catalysts.
2. They help in breaking up of complex molecules in food into simpler and then absorb molecules.

Question 8.
The biomass in each ‘X’ is always less than the trophic level below. This is because biomass is a measure of the amount of ‘Y’ available.

What are ‘X’ and ‘Y’ in the above paragraph?
Answer:
X – trophic level
Y – food

Question 9.
What tools and plant parts are used for observing pollen grains?
Answer:
Pollen grains of Datura flower, water, slide, microscope, laboratory needles, foreceps etc.

Question 10.
What happens if CO is not expelled during exhalation?
Answer:
If CO₂ is not removed from the body it becomes toxic and normal functioning of tissues will be affected. Due to that, the organism may eventually die.

SECTION – III
(5 × 4 = 20 M)

Note:

1. Answer all the questions.
2. Each question carries 4 marks.

Question 11.
What would be the consequences if our diet completely lacks leafy vegetables?
Answer:

1. Absence of leafy vegetables in our diet causes vitamin deficiency.
2. Lack of leafy vegetables causes deficiency of vitamins A, B (Folic acid), some amount of ‘C’ and iron.
3. The diseases caused due to the deficiency of these vitamins are Anaemia, Skin diseases, and Eye diseases.

Question 12.
A) Draw the labelled diagram of human digestive system. List out the parts where peristalsis takes place.
Answer:

Peristalsis takes place in:

1. Oesophagus
2. Stomach
3. Small Intestine
4. Large Intestine

(OR)

B) Draw a neat labelled diagram of Embryo sac.
Answer:

Question 13.
You have done the experiment on taste by chewing the cumin, sounf, potato and apple by closing nose.

Answer the following.
i. Did you recognise the taste immediately after chewing ?
Answer:
No. The taste was not recognised. We recognised the taste only after mixing it up with the saliva.

ii. Did you know the taste of cumin, without popping it in mouth ?
Answer:
We can recognise the taste upto some extent by smelling it.

Question 14.
Organisms like sponges are sedentary. How does water transportation occur in them?
Answer:
The protozoans like sponges, use sea water for transportation. Since the natural water currents are not reliable, the sponges create their own currents by beating their flagella.

Question 15.
Give reasons, though we have plenty of ponds, rivers we don’t have drinking water.
Answer:

1. Though we have plenty of ponds, rivers, there is scarcity of water.
2. Man depends upon the ground water for drinking purpose.
3. Though ponds, rivers, brooks have plenty of water they are not used for drinking purpose. They are polluted by human activities.

SECTION – IV
(2 × 8 = 16 M)

Notes :

1. Answer all the questions.
2. Each question carries 8 marks.
3. Each question has internal choice.

Question 16.
A) Prepare a flow chart showing evolution of man through ages.
Answer:

(OR)

B) Explain the theory of “inheritance of acquired characters” with an example.
Answer:

1. Jean Baptist Lamarck proposed the theory of inheritance of acquired characters.
2. According to this theory the new characters that are developed during the life time of an organism are passed to next generation.
3. For example initially giraffe was equal to deer. Due to shortage of food materials and to reach the lower branches of tree giraffe started stretching its neck.
4. Because of continuous stretching of neck after several generations giraffe developed long neck.
5. Such characters that are developed during the life time of an organism are called acquired characters. These acquired characters are passed to next generation.

Question 17.
A) You have conducted this experiment in your class room. Now answer the following questions.

i) What do you prove by conducting this experiment?
Answer:
To test the production of heat and carbon dioxide during anaerobic respiration.

ii) Why do you heat glucose solution?
Answer:
To remove the dissolved oxygen in the glucose solution.

iii) How do you confirm that glucose solution is free from oxygen after heating it?
Answer:
By adding diazene green (Janus green B) solution to glucose solution, it turns to pink.

iv) What are the changes you noticed in the lime water?
Answer:
Lime water turns milky white.

(OR)

B) You have conducted the CO₂ experiment in your laboratory. Give the answers for the following questions.

a) Why is the plant kept in dark place before conducting the experiment?
Answer:
Before the experiment, we have to make the plant free from starch. Otherwise we will not get exact results for proving role of the factors in photosynthesis.

b) If there is no iodine for starch test, what would be the alternative chemical to be used ?
Answer:

1. if there is no iodine for starch test we can use tincture iodine available in the first aid box.
2. We can also use betadine which is available in medical shops.

c) Why did you choose the long leafed plant only ?
Answer:
The long leaf helps to arrange properly in the bottle and it gets more light on the surface.