AP 10th Class Biology Model Paper Set 9 with Solutions

Teachers often recommend practicing with AP 10th Class Biology Model Papers Set 9 to enhance exam readiness.

AP SSC Biology Model Paper Set 9 with Solutions

Time : 2 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 should be written in the answer booklet only.
5. Answer should 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.
Which phenomenon acts as a driving force to pull water from the root xylem cells to leaf cells in the plant, during the day time?
Answer:
Transpiration.

Question 2.
Write a slogan to “Save our Earth”.
Answer:
1. “Eliminate plastic to preserve the Earth.”
2. “A thriving Earth ensures a healthy life.”
3. “Minimize waste to safeguard the Earth.”

Question 3.
Identify the instrument used in the given picture.

Answer:
Sphygmomanometer

Question 4.
Define the term ‘Heredity
Answer:
The transmission of traits from one generation to the next is known as heredity.

Question 5.
What happens, if variations do not occur in a species?
Answer:
“The organisms’ chances of survival diminish.”
(OR)
“Evolution fails to occur.”
(OR)
“All members of a species will be identical.”

Question 6.
Read the paragraph and answer the given question.
Ozone at the higher levels of the atmosphere, protects us from the ultraviolet radiation
from the Sun. This radiation is one of the cause of skin cancer in the human beings.
I) Which rays cause skin cancer to us?
Answer:
Ultraviolet rays.

Section – II (4 × 2 = 8)

Note :
1) Answer all the questions.
2) Each question carries 2 marks.

Question 7.
Write the differences between biodegradable and non-biodegradable wastes.
Answer:

1. Biodegradable Waste :
   • Waste materials that decompose naturally through biological processes are known as biodegradable waste.
   • Examples Cattle dung, paper, vegetable waste, etc.
2. Non biodegradable Waste:
   • Waste materials that do not decompose through biological processes are called non-biodegradable waste.
   • Examples Plastics, polythene bags, etc.

Question 8.
If haemoglobin level may decreases in our blood, what happens?
Answer:

1. A lack of hemoglobin causes anemia.
2. Difficulty in breathing.
3. Tiredness and weakness.
4. Lightheadedness. .
5. Reduced focus and concentration.

Question 9.
Read the given table and answer the following questions.
Answer:
i) Cytokinins
ii) Abscisic Acid.

Question 10.
What questions will you ask your teacher to know more about ecological systems?
Answer:
1. What are the key elements of an ecosystem?
2. How does energy transfer take place within an ecosystem?
3. Why is biodiversity important for an ecosystem?
4. How do living (biotic) and non-living (abiotic) factors influence an ecosystem ?

Section – III (5 × 4 = 20 M)

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

Question 11.
Write the differences between arteries and veins.
Answer:
Arteries:

1. Transport blood from the heart to different organs.
2. Possess thick and elastic walls.
3. Do not have valves.
4. Maintain high blood pressure.

Veins:

1. Carry blood from various organs back to the heart.
2. Have thin walls.
3. Contain valves.
4. Experience low blood pressure.

Question 12.
Answer any one of the following.
A) Draw a neat labelled diagram of neuron.
Answer:

B) Observe the given diagram and answer the following questions.

i) Identify the Parts ‘A’ and ‘B’.
ii) Fertilization of the egg cell occurs in which part?
iii) Implantation of the embryo occurs in which part?
Answer:
i) ‘A’ is Ovary ‘B’ is Uterus
ii) Fallopian’tube (or) Oviduct
iii) Uterus

Question 13.
Write the different types of contraceptive methods.
Answer:

1. Establishing a physical barrier to block sperm from reaching the egg. Example: Condoms and vaginal coverings.
2. Taking oral pills to alter hormonal balance, preventing the release of eggs.
3. Using contraceptive devices like Copper-T and loops.
4. Opting for surgical procedures such as vasectomy in males and tubectomy in females.

Question 14.
Suggest some environment – friendly practices to protect our nature.
Answer:

1. Minimizing plastic usage.
2. Limiting the use of chemical fertilizers, insecticides, and pesticides in farming.
3. Increasing tree plantation.
4. Promoting organic farming.
5. Utilizing public transportation.
6. Bringing cloth or jute bags when shopping.

Question 15.
Observe the given chart and answer the following questions.

i) What is the first step occurs in the respiration of the cell?
ii) In which cells, lactic acid formation occurs?
iii) Aerobic respiration occurs in which organelle of the cell?
iv) What are the end products released in the anaerobic respiration of yeast cells?
Answer:
i) Formation of pyruvate from the glucose molecule / Glycolysis.
ii) Muscle cells
iii) Mitochondria
iv) Ethanol, carbon dioxide and energy

Section – IV (2 × 8 = 16 m)

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

Question 16.
A) Describe the experiment to prove that carbon dioxide is essential for photosynthesis in plants.
Answer:
A) Aim: To prove that carbondioxide is essential for photosynthesis.
Apparatus:

1. Two Bell Jars
2. Two healthy potted plants with same size.
3. Glass plates
4. KOH (Potassium Hydroxide)
5. Watch glass
6. Iodine

Procedure:

1. Take two healthy potted plants of the same size and keep them in a dark room for three days to remove stored starch.
2. Place each plant on a separate glass plate.
3. Place a watch glass containing KOH beside one of the plants to absorb carbon dioxide.
4. Cover both plants with separate bell jars.
5. Seal the bottom of each bell jar with vaseline to prevent air from entering.
6. Expose the plants to sunlight for about two hours.
7. Pluck a leaf from each plant and test for starch using iodine solution.

Observation:

1. The leaf from the plant inside the bell jar containing KOH did not change color.
2. The leaf from the plant inside the bell jar without KOH turned blue-black.

Result: The experiment confirms that carbon dioxide is essential for photosynthesis.

(OR)
B) Describe the experiment you conduct to show the response of plant to the direction of light.
Answer:
B) Aim To demonstrate the response of plants to the direction of light (or) to prove phototropism in plants.
Apparatus:

1. Cardboard box
2. Wire mesh
3. Conical flask
4. Germinating seeds

Procedure:

1. Fill a conical flask with water.
2. Cover the neck of the flask with wire mesh.
3. Place two or three freshly germinated bean seeds on the wire mesh.
4. Take a cardboard box that is open on one side.
5. Position the flask inside the box so that the open side faces the light coming from a window.

Observation:

1. After two or three days, it is observed that the shoots bend toward the light, while the roots grow away from it.
2. When the flask is turned so that the shoots are away from the light and the roots face the light, the same response is observed after a few days.

Result:

1. The shoot of the plant bends toward the light.
2. The root of the plant bends away from the light.
3. These results prove the presence of phototropism in plants.

Question 17.
A) Explain the process of sexual reproduction in flowering plants briefly.
Answer:

1. The flower is the main reproductive organ of a plant.
2. It contains the male reproductive organs (stamen) and the female reproductive organs (pistil).
3. Pollen grains (male gametes) produced in the anther of the stamen are transferred to the stigma of the pistil by pollinators such as wind, insects, etc.
4. The pollen grain germinates on the stigma and forms a pollen tube that grows down the style toward the ovary.
5. The pollen grain’s nucleus produces two male nuclei, which travel to the tip of the pollen tube.
6. Meanwhile, in the ovary, the ovules mature and contain the female gamete and secondary nucleus.
7. When the pollen tube enters the ovule, it bursts, releasing the two male nuclei.
8. One male nucleus fuses with the female gamete, and the other fuses with the secondary nucleus.

The fertilized female gamete develops into a zygote, and the secondary nucleus forms the endosperm. This process is called double fertilization, a unique phenomenon in flowering plants.

(OR)
B) How is the sex of a child determined in human beings?
Answer:

1. Human beings contain 23 pairs (or) 46 chromosomes.
2. In these 44 (22 pairs) are known as autosomes and these are same in both male and female.
3. Remaining 2 (1 pair) are known as allosomes and these are ‘XX’ in female and ‘XY’ in male.
4. Hence, male produce two types of sperm cells. They are ‘22 + X’ and ‘22 + Y’.
5. But female produce all ova with ‘22 + X’ only.
6. If 22 + X sperm cell fertilizes with ovum, it develops as female child.
7. If 22 + Y sperm cell fertilizes with ovum, it develops as male child.