AP 10th Class Biology Model Paper Set 10 with Solutions

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

AP SSC Biology Model Paper Set 10 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.
What is the respiratory pigment in human beings?
Answer:
Haemoglobin

Question 2.
What steps do you take to limit the damage to the ozone layer in your daily life?
Answer:
A. Avoid usage of CFC’s
B. Minimize the usage of Air Conditions and refrigerators

Question 3.
Observe the given picture and write the phenotype ratio of the characters appear in F2 generation.
Img- 1
Answer:
3 : 1

Question 4.
Expand CFC.
Answer:
Chloro Fluoro Carbons

Question 5.
What will happen if sperm containing V chromosome fertilise the ovum?
Answer:
The baby is male

Question 6.
Normal range of blood pressure is
A) 150/90
B) 120/80
C) 110/60
D) 80/120
Answer:
B) 120/80

Section – II (4 × 2 = 8 M)

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

Question 7.
Why are some patients with diabetes treated by giving injections of insulin?
Answer:
Some patients with diabetes are treated with insulin injections because they have a deficiency of the hormone insulin, which is naturally produced by the pancreas to regulate blood sugar.This condition is called diabetes.

Question 8.
What precautions will you take for your dental health?
Answer:

1. Take care of your teeth and mouth.
2. Brush your teeth twice a day with fluoride toothpaste.
3. Observe your teeth regularly.
4. Visit your dentist routinely for a checkup and cleaning.
5. Eat a well-balanced diet.
6. Quit smoking. Smoking increases your risk for gum disease.
7. Avoid sugar content food item like chocolates and cool drinks.

Question 9.
What is the main energy source of an ecosystem? What is the path of energy flow in an ecosystem?
Answer:
A. The sun is the main energy source of an ecosystem.
B. Energy flowing from producers ,then to herbivores, and carnivores.

Question 10.
If pesticides enter Into the food chain what Will happen?
Answer:

1. When pesticides enter the food chain, they accumulate and increase in concentration at higher trophic levels, a process called biomagnification.
2. This harms non-target organisms, causing illness.

Section – III (5 × 4 = 20)

Note:
1. Answer all the questions.
2. Each question carries 4 marks.
3. There is an internal choice in only the question number 12.

Question 11.
Explain the human excretory system.
Answer:
1. The excretory system of human beings includes a pair of kidneys, a pair of ureters, a urinary bladder and a urethra.
2. Kidneys are located in the abdomen, one on either side of the backbone.
3. Urine produced in the kidneys passes through the ureters into the urinary bladder.
4. Where it is stored until it is released through the urethra.

Question 12.
Draw a neat labelled diagram of the following.
A) Fertilization in plants
Answer:

(OR)
B) The human digestive system
Answer:

Question 13.
What are the tropic levels ?Give an example of a food chain and state the different trophic levels in it?
Answer:
Trophic levels:
The position, level, or position in a food web, a food chain, or an ecological pyramid is known as a trophic level.
The first trophic level is formed by the producers, as they produce food. The second trophic level is formed by the primary consumers. The third trophic level is formed by the secondary consumers. The fourth trophic level is formed by the tertiary consumers. Example of a food chain:

Here producer is the grass, which is consumed by the grasshopper, that is the primary consumer. The grasshopper is further consumed by the frog, that is, the secondary consumer. The frog is consumed by snake that is, the tertiary consumer. Lastly, the snake is eaten up by the eagle, that is, the top consumer.

Question 14.
What will help you to keep your digestive system healthy?
Answer:

1. Include fiber-rich food in your diet.
2. Limit intakes of fatty foods.
3. Chew your food properly.
4. Incorporate probiotics in your diet.
5. Water is essential for a smooth digestive system.
6. Regular exercise make your digestion good.

Question 15.
A plant which grows near a window bends towards light .Explain why plants possess this type of response?
Answer:

1. Auxins are the plant hormones responsible for the growing of the stem, towards light.
2. The potted plant which is kept near the window in the room, grows towards light.
3. Auxins are synthesized at the tip of the stem. They acts on bending of stem response to the sunlight.
4. More auxin collects on the light illuminated side of the stem. So cells on that side grow faster.
5. On the opposite side cells grow stow to make the stem to bend.
6. Bending of the plant towards light is called phototropism.

Section – IV (2 × 8 = 16)

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

Question 16.
A) How do you prove that CO₂ is necessary for photosynthesis?
Answer:
Aim : To show that carbon dioxide is necessary for photosynthesis.
Material Required : Two healthy potted plant of same size, two glass plates, two bell jars, vaseline, watch glass, potassium hydroxide, alcohol, spirit lamp and beaker.

Procedure:

1. Keep the two potted plants of same size in dark for three days so that the leaves become free from starch.
2. Place the potted plant (a) on a glass plate and put a watch glass containing potassium hydroxide (KOH) by the side of the pot and cover it with a bell jar.
3. Place the other potted plant (b) on a second glass plate and cover it with a bell jar.
4. Vaseline is used to seal the bottom of jars to the glass plates, so that the setup is airtight.
5. Both the plants are kept in sunlight for two hours.
6. Pluck a leaf from each plant and test the same for the presence of starch.

Obervation:

1. It is observed that the leaf of plant kept in the bell-jar having KOH dldn’t change its colour.
2. It is observed that the leaf of plant kept in the bell-Jar without KOH, has changed its colour into blue black.

Resuit: Based on the above observations, it is proved that CO_{2, is essential for photosynthesis}

(OR)
B) Describe the process to observe the spores on bread slice.
Answer:
Aim To observe the spores in Rhizopus (a type of fungus).
Materials Required . A piece of bread, A transparent plastic box, A dropper, A magnifying glass or microscope.

Procedure:

1. Take a piece of bread and slightly moisten it with water.
2. Place it inside a transparent plastic box and close it to create a humid environment.
3. Keep the box in a warm, dark place for 2-3 days.
4. After a few days, you will notice a cotton – like blackish- grey layer of fungus growing on the surface.
5. Using a magnifying glass or a microscope, carefully observe the tiny, round structures on the fungal threads.
6. These round black structures are sporangia, which contain spores of Rhizopus.

Observation : A blackish or greyish cotton – like fungus grows on the bread. Small round black sporangia can be seen under a magnifying glass. When the sporangia burst, they release tiny spores, which spread and help in reproduction.

Conclusion: This activity shows that Rhizopus reproduces through spores, which are stored in sporangia and dispersed when the conditions are favorable.

Question 17.
A) How does phototropism occur in plants?
Answer:
Phototropism is the growth movement of plants in response to light. It helps plants maximize their exposure to sunlight for photosynthesis.

Process of Phototropism :

1. Detection of Light The tip of the plant shoot detects light and responds by producing a plant hormone called Auxin.
2. Auxin Distribution : In the presence of light, auxin moves to the shaded side of the stem.
3. The higher concentration Of auxin on the shaded side stimulates faster cell growth compared to the illuminated side.
4. Uneven Growth : Since the shaded side grows faster, the plant bends towards the light source.
5. Result: The shoot grows in the direction of the light, helping the plant absorb maximum sunlight for photosynthesis.

Types of Phototroplsm:
Positive Phototroplsm – Shoots grow towards the light Negative Phototroplsm – Roots grow away from the light

(OR)
B) Explain how the sex of the child is determined In human beings.
Answer:

1. In the human being, the chromosomal mechanism of sex determination Is of XX-XY type
2. In humans the nucleus of each cell contains 46 chromosomes or 23 pairs of chromosomes of body characters known as autosomes, and 1 pair is of sex chromosomes known as allosomes.
3. In the female, two homomorphic sex chromosomes are XX.
4. In the male, two heteromorphic sex chromosomes are XY.
5. The genotypes of female and male is
   • Female : 46 Chromosomes = 44 Autosomes + XX sex chromosomes
   • Male : 46 Chromosomes = 44 Autosomes + XY sex chromosomes
6. If the sperm that has X chromosome fuse with ovum, the zygote have XX chromosomes. It means the baby is female.
7. If the sperm that has Y chromosome fuse with ovum, the zygote have XY chromosomes. It means the baby is male.
8. So the sex of baby is determined by the sperm that fuse with ovum.