AP 10th Class Biology Model Paper Set 2 with Solutions

Teachers often recommend practicing with AP 10th Class Biology Model Papers Set 2 to enhance exam readiness.

AP SSC Biology Model Paper Set 2 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 -1
(6 × 1 = 6 M)

Note :

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

SECTION – 1
(6 x 1 = 6 M)

Note :

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

Question 1.
Ravi’s blood pressure is noted as 120/80 mm of Hg. What does 120 and 80 indicate?
Answer:
120 – Systolic pressure
80 – Diastolic pressure

Question 2.
Prothromhin Thrombin; Fibrinogen Fibrin
Which enzyme converts the prothrombin into thrombin?
Answer:
Thrombokinase

Question 3.
What precautions are to be followed to prevent AIDS?
Answer:

1. One has to follow ethical and healthy life practices.
2. Using disposable syringes.
3. Practising safe sex etc.

Question 4.
Imagine the consequences of indiscriminate use of forests.
Answer:

1. Loss of biodiversity
2. Ecological imbalance.
3. Soil erosion.

Question 5.
Write the differences between affarent and efferent nerves.
Answer:

Afferent Nerves	Efferent Nerves
1) They transmit impulses from sensory organs to brain (or) spinal cord.	1) They transmit impulses from brain or or spinal cord to body parts.
2) These are generated from dorsal horn in the spinal cord.	2) These are generated from ventral horn in the spinal cord.

Question 6.
Make any two food chains of your own.
Answer:
Grass → (Grasshopper) → Frog → Snake → Hawk
Grains → Insects → Hen → Human

SECTION – II
(4 × 2 = 8 M)

Note :

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

Question 7.
Write any two suggestions to prevent obesity.
Answer:

1. Avoid junk food and over eating.
2. Practise regular exercises.

Question 8.
There are nearly 180 vestigial organs in human beings. Pinna, hair or skin, mammary glands in males, appendix etc.

From the above passage answer the following questions.

A) How many vestigial organs are there in human beings?
Answer:
180

B) Give any two examples for vestigial organs in human beings.
Answer:
Pinria, hair on skin, mammary glands in males, appendix.

Question 9.
If you have a chance to meet a pulmonologist, what questions do you ask to keep your lungs healthy during the COVID – 19 pandemic period?
Answer:

1. How do we protect ourselves from the Covid -19?
2. What should we do for the healthy lungs?
3. What are the causes for respiratory diseases?
4. How does smoking damage the lungs?

Question 10.
Prepare any two slogans to prevent global warming.
Answer:

1. Save nature – Save the future
2. Plant the trees and save the earth from global warming.

SECTION – III
(5 × 4 = 20 M)

Note :

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

Question 11.
Observe the table and answer the following questions.

Name of the phylum / class organism	Excretory system
Protozoa	Simple diffusion from the body surface into the surrounding water.
Porifera and coelenterate	Water bathes almost all their cells
Platyhelminthes	Flame cells
Nematoda	Renette cells
Annelids	Nephridia
Arthropoda	Green glands, Malpighian tubules
Mollusca	Meta nephridia
Echinodermata	Water vascular system
Reptiles, Aves (Birds) and Mammals	Kidneys

A) In which phylum organisms have no specific excretory organs?
Answer:
A) Protozoa, Porifera and Coelenterata.

B) Which organisms have kidneys as excretory organs ?
Answer:
Reptiles, birds and mammals have kidneys as excretory organs.

C) Name the excretory organs in Arthropods.
Answer:
Excretory organs in Arthropoda are green glands and malpighian tubules.

D) Name the phylum where the excretory organs first evolved.
Answer:
Exeretory organs are first evolved in platyhelminthes.

Question 12.
Draw a neat labelled diagram of excretory system of human beings.
Answer:

(OR)

Draw neat labelled diagrams of male and female reproductive systems of plant.
Answer:

Question 13.
Explain any two diseases caused due to the malnutrition.
Answer:
Two diseases caused due to malnutrition are

1. Kwashiorkor disease
2. Marasmus

1. Kwashiorkor disease:

1. This is caused due to the deficiency of proteins in the diet.
2. Body parts become swollen due to accumulation of water in the intercellular spaces.
3. Very poor muscle development.
4. Swollen legs and fluffy face.
5. Often suffer from diarrhoea and dry skin.

2. Marasmus:

1. This is caused due to the deficiency of proteins in the diet.
2. Generally this disease occurs when there is an immediate second pregnancy or repeated child births.
3. Lean and weak body parts.
4. Swelling in joints of limbs and less developed muscles.
5. Often suffers from diarrhoea and dry skin.

Question 14.
What procedure did you follow in your laboratory to observe the growth of sporangia in Rhizopus (or) common mold ?
Answer:

1. Place a drop of water on the centre of the slide.
2. Using a toothpick, scrape very little of the mold and place it on the drop of water.
3. Then cover it with cover slip without trapping any air bubbles.
4. Remove excess water at the edges of the coverslip with a tissue paper.
5. Observe the slide under a compound microscope.

Question 15.
If the valves in the veins of the legs stop the flow of blood, guess what could be the consequences of this condition ?
Answer:

1. If the valves in the veins of the legs fail reverse flow of the blood will be stopped,so that the blood accumulates in the veins and causes swelling of legs and leads to edema.
2. On the other hand, blood will not circulate properly to the heart and blood circulation will be affected.

SECTION – IV
(2 × 8 = 16 M)

Note :

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

Question 16.
A) Observe the following experimental set-up and answer the following questions:

a) What is the aim of this experiment?
Answer:
To prove the release of CO₂ by anaerobic respiration.

b) Which organism is taken for this experiment?
Answer:
Yeast

c) Which chemical is used to test the presence of oxygen ?
Answer:
Diazine green (or) Janus green – B

d) How do you prevent the entry of oxygen into the glucose solution of this experiment ?
Answer:
By pouring liquid paraffin on the surface of glucose solution.

(OR)

B) Draw the diagram showing the apparatus of hydrilla experiment i.e. the experiment which shows O₂ is released during photosynthesis conducted by you.

a) Write the reasons to keep the test tube invertly on the stem of the funnel.
Answer:

Hydrilla Experiment

In this experiment the test tube was inverted on the funnel to collect gas released during photosynthesis.

b) Give a balanced equation to represent the process.
Answer:
6CO₂ + 12H₂O C₆H₁₂O₆ + 6H₂O + 6O₂

c) How do you test the gas released in the experiment ?
Answer:
If we put glowing splinter it bums brightly.

d) What happens if a same set is kept in dark for sometime ?
Answer:
No gas bubbles are produced.

Question 17.
A) Observe the pyramid and answer the following questions.

a) Which trophic level has less number of organisms ?
Answer:
4th trophic level / Tertiary consumers.

b) Who are the producers in the given pyramid ?
Answer:
Green plants / Autotrophs.

c) Give two examples of primary consumers.
Answer:
Cow, goat.

d) What happens if the primary consumers are removed from the pyramid ?
Answer:
No food will be available to the carnivores and they will die. The number of producers will be increased.

(OR)

B) Give reasons.

a) Why is photosynthesis considered the basic energy source for most of living world ?
Answer:

1. During photosynthesis, plants trap solar energy and by utilising simple inorganic substances like CO₂ and H₂O, they prepare complex organic substances like carbohydrates.
2. These carbohydrates are utilised for providing energy for most living organisms including human beings.
3. It is the only process which adds O₂ to the atmosphere and makes our living possible.
4. Hence, photosynthesis is considered the basic energy source for most of living world.

b) Why is it better to call the dark phase of photosynthesis a light independent phase ?
Answer:

1. Dark reaction of photosynthesis does not require light energy. It occurs in the presence or absence of light
2. Hence it is better to call the dark phase of photosynthesis as a light independent phase.

c) Why is it necessary to destarch a plant before performing any experiment on photosynthesis ?
Answer:

1. To get better results from related experiment, it is necessary to destarch a plant before performing any experiment on photosynthesis.
2. The plant which is kept in the dark place for few days for the removal of starch from the leaves, is called a destarched plant.

d) Why is it not possible to demonstrate respiration in green plants kept in sunlight?
Answer:

1. During day time plants carryout photosynthesis actively.
2. During this time O₂, given out as a by-product, is taken up by plants for respiration.
3. Not only this, CO₂ produced during respiration will be used up in photosynthesis.
4. As both photosynthesis and respiration are inter related, it is not possible to demonstrate respiration during day time.