AP 10th Class Biology Question Paper April 2022 with Solutions

Teachers often recommend practicing with AP 10th Class Biology Model Papers and AP 10th Class Biology Question Paper April 2022 to enhance exam readiness.

AP SSC Biology Question Paper April 2022 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.

Question 1.
Why Gilricidia plantation is done on the field bunds?
Answer:

1. To strengthen the field bunds
2. To make the soil nitrogen rich.
3. To prevent soil erosion.

Question 2.
Observe the sample graph.

What is the relationship between heart beat and the pulse?
Answer:
Heart beat is equal to pulse rate.

Question 3.
Prepare a questionnaire to ask an Environmentalist about the consumption of fossil fuels.
Answer:

1. How are fossil fuels formed?
2. Which is the highest consuming fossil fuel?
3. What are the consequences of using fossil fuels?
4. How does fossil fuels affect the environment?

Question 4.
Label the parts given in the diagram.

Answer:
A – Grana thylakoid / Granum / Grana
B – Stroma

Question 5.
Write examples for renewable and non-renewable resources.
Answer:

• Renewable Resources – Sunlight, Air, Water
• Non-Renewable Resources – Petrol, Coal

Question 6.
Write slogans to stop child marriages.
Answer:

1. Stop child marriages to save the precious childhood of a child.
2. A child needs education to lead a prosperous life, not marriage.

SECTION – II
(4 × 2 = 8 M)

Note :

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

Question 7.
Why did Mendel choose Garden-pea for his experiments?
Answer:
Mendel has chosen the pea plants for his experiments due to the following reasons.

1. Pea plants have well defined characters.
2. Bisexual flowers.
3. Pure breeds can be easily obtained through self fertilisation.
4. Hybridization can be done easily.
5. It is an annual plant.

Question 8.
If you have a chance to meet a Cardiologist, what questions do you ask to know about the heart diseases?
Answer:

1. What type of foods are to be taken to make our heart fit and healthy ?
2. Through which symptoms we can recognize the heart problems ?
3.  What are the precautions to be taken to avoid heart attack?

Question 9.
Observe the following table:

i) What is the phenotypic ratio of F₂ generation monohybrid cross?
Answer:
3 : 1

ii) What is the dominant character in the given monohybrid cross?
Answer:
Yellow

Question 10.
Natural resources have been decreasing more rapidly. Guess what will be the consequences.
Answer:
Natural resources have been decreasing more rapidly. The consequences will be

1. The things which we need for the survival will be disappeared.
   Eg : Food, water and air.
2. Fertile soil is exhausted and poor farming practices cause scarcity of food.
3. Fuel supplies will be depleted.
4. Water and air will be polluted.
5. Soil erosion, global warming, loss of biodiversity may occur.

SECTION – III
(5 × 4 = 20 M)

Note :

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

Question 11.
Write the differences between Photosynthesis and Respiration.
Answer:
Differences between photosynthesis and respiration.

Photosynthesis	Respiration
1. Photosynthesis takes place only in green plants and in photosynthetic bacteria,	1. Respiration takes place in all living organisms.
2. It occurs in the chloroplast.	2. Aerobic respiration takes place partly in cytoplasm and partly in mitochondria.
3. It is an anabolic process.	3. It is a catabolic process.
4. CO2 is utilized and O2 is released.	4. O2 is utilized and CO2 is released.
5. The weight of the organism increases due to the photosynthesis.	5. The weight of the organism decreases due to respiration.
6. Produces ATP by utilising light energy.	6. Produces ATP by oxidising glucose.

Question 12.
Draw a neat labelled diagram of longitudinal section of a flower.
Answer:

(OR)

Draw the diagram of arrangement of teeth. Write the dental formula.
Answer:
Dental formula = \(\frac{2}{2}, \frac{1}{1}, \frac{2}{2}, \frac{3}{3}\)

Question 13.
Explain the process of blood clotting in human beings.
Answer:

1. Blood platelets play an important role in blood clotting.
2. When blood vessels are injured, the platelets release an enzyme called thrombokinase.
3. Thrombokinase acts on another substance called prothrombin and converts it into thrombin.
4. Thrombin acts on another substance called fibrinogen and converts it into insoluble fibrin.
5. The blood cells entangle in the fibrin fibres forming the clot.
6. The fibrin fibres are attached to the edges of the wound and pull them together.

Question 14.
Observe the following table and answer the questions given below :

ALKALOID	PLANT	PART	USES
Quinine	Cinchona officinalis (Cinchona)	Bark	Antimalarial drug
Nicotine	Nicotiana tobacum (Tobacco)	Leaves	Insecticide
Morphine	Cocaine Papaver somniferum (Opium)	Fruit	Sedative, painkiller
Reserpine	Rauwolfia serpentina (Snake root)	Root, bark	Medicine for snake bite
Caffeine	Coffea arabica (Coffee Plant)	Seed      Central nervous system	stimulant
Nimbin	Azadirachta indica (neem)	Seeds, barks, leaves	Antiseptic
Scopolamine	Datura stramonium	Fruit, flower	Sedative
Pyrethroids	Tridax	Flower	Insecticides

(i) Name the alkaloids that are used as insecticides.
Answer:
Nicotine, pyrethroids

(ii) Which plant yields alkaloid used for the treatment of malaria ?
Answer:
Cinchona officinalis / Cinchona

(iii) What are the uses of Neem plant ?
Answer:
Used as an Antiseptic

(iv) What is the use of Reserpine ?
Answer:
Medicine for snake bite

Question 15.
Suggest some programmes helpful for the prevention of soil pollution by avoiding pesticides.
Answer:
By using the following methods the usage of pesticides can be avoided and soil pollution can be prevented.

1) Rotation of crops :
Growing different crops on a particular piece of land in successiveyears reduces the occurrence of pests.

2) Biological control :
Introducing natural predators or parasite of the pest.

3) Sterility :
Rendering the males of a pest species sterile.

4) Genetic strains :
The development of genetically modified plants which are resistant to certain pests.

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 questions below.

i) What is the aim of this experiment ?
Answer:
To prove that oxygen is produced during photosynthesis.

ii) What are the apparatus required for conducting this experiment ?
Answer:
Beaker with water, test tube, funnel, Hydrilla twigs, match box

iii) Which gas is collected at the end of the test tube after conducting the experiment?
Answer:
Oxygen

iv) What precautions are to be taken while conducting the experiment ?
Answer:
i) Ensure that the level of water in the beaker is above the level of stem of the inverted funnel.
ii) The test tube must be full of water without air bubbles.
iii) While removing the test tube from the beaker put the thumb on the mouth of the test tube carefully.

(OR)

B) Explain the procedure to prove that CO₂ is released in aerobic respiration.
Answer:

1. Take two wide mouthed glass bottles.
2. Keep germinating seeds in one bottle and dry seeds in another bottle.
3. Keep two small beakers with Lime water in each glass bottles.
4. Close the glass bottles tightly.
5. Keep both the sets undisturbed for one or two days.
6. It is observed that the lime water turns to milky white in germinating seeds due to the release of CO₂ in respiration.

Question 17.
A) Pollen grain reached the stigma of a flower. Explain the changes that occur up to the formation of seeds in a sequence.
Answer:

1. Fertilization occurs in the ovary of the flowering plants.
2. Ovary contains ovule. It comprises the integuments, gametophyte cells, embryo sac.
   a) Embryo sac has a large central cell containing two nuclei called polar nuclei.
   b) Female gametophyte or egg which is bigger in size is located at the end ofembryosac surrounded with two synergids.
   c) Anti-podals are located at the other side of embryo sac.
3. Cells on the surface of the stigma secrete a sticky nutrient fluid containing sugar and .other substances.
4. This will help the pollengrain to germinate to form pollen tube.
5. The pollen tube penetrates into opening of ovule and finally enters into the embryo sac and releases the two male nuclei into the embryo sac.
6. One of the two nuclei fuses with the egg to form a zygote. The second male nucleus fuses with fusion nucleus and forms the endosperm.
7. Thus, the union of one male nucleus with the egg, and the second male nucleus with fusion nucleus is called double fertilization.

(OR)

B) Explain various steps in the mechanism of urine formation.
Answer:
Urine Formation:

i) Glomerular filtration :
Blood flows inside the glomerulus under the influence of pressure due to the narrowness of efferent arteriole. As a result it undergoes pressure filtration or ultra filtration. Waste molecules, nutrient molecules and water are filtered out and enter the Bowman’s capsule.

ii) Tubular reabsorption : The peritubular capillaries around PCT reabsorb all the useful components of primary urine such as glucose, amino acids, vitamin C, Potassium, Calcium, Sodium, Chlorides and 75% of Water.

iii) Tubular secretion : It is the active secretion of waste products by blood capillaries into the urinary tubule. It ensures removal of all the waste products from blood, viz., urea, uric acid, creatinine, salt ions like K+, Na+ and H+ ions. This maintains proper concentration and pH of
urine.

Mechanism of urine formation

The urine formed in different stages is collected by the collecting tubes. Later they send the urine to pelvis. Pelvis carry the urine to ureters. Ureters carry urine to urinary bladder. Due to the affect of hormone vasopressin urine is passed out.