Reviewing solved Biology Class 10 Kerala Syllabus Question Paper Set 2 English Medium helps in understanding answer patterns.
Biology Class 10 Kerala Syllabus Model Question Paper Set 2
Time: 1 1/2 Hours
Total Score: 40
Instructions:
- The first 15 minutes is cool-off time.
- This time can be used for reading the questions and planning the answers
- Write answers only according to the instructions and questions
- While writing the answers, consider the score and time.
Questions from 1 to 4 carry 1 score each. (4 × 1 = 4 scores)
Question 1.
Which is the activity that takesplace in nucleus.
(a) tRNAs carry specific amino acids to the ribosome.
(b) mRNA is formed.
(c) Combine amino acids to make protein.
Answer:
(b) mRNA is formed.
Question 2.
Find the correctly matched pair from the given answers.
| Short sight | Eye lens become opaque |
| Cataract | Prolonged deficiency of vitamin A |
| Night blindness | Enlarged eyeball |
| Hyperthyroidism | deficiency of vitamin A |
(a) A: i, B: ii, C: iii, D: iv
(b) A: iii, B: i, C: iv, D: ii
(c) A: iii, B: iv, C: ii, D: i
(d) A: iv, B: i, C: iii, D: ii
Answer:
(b) A: iii, B: i, C: iv, D: ii
Question 3.
Examine the statement and reason and select the correct answer.
Statement: Insulin and Glucagon are the hormones that help in regulating the blood glucose level.
Reason: Insulin increases the blood glucose level, and Glucagon decreases the blood glucose level.
(A) Both statement and reason are correct. The reason is the correct explanation of the statement.
(B) Both statement and reason are correct. The reason is an incorrect explanation of the statement.
(C) Statement is correct. Reason is incorrect.
(D) Statement is incorrect. Reason is correct.
Answer:
(C) Statement is correct. Reason is incorrect.
Question 4.
What is CRISPR?
Answer:
CRISPR is a modem technology used to edit DNA with great precision
Questions from 5 to 11 carry 2 scores each. (7 × 2 = 14 scores)
Question 5.
A. Complete the table.
Non Mendelian Inheritance
Incomplete Dominance
_____ (b)
Cause
_____(a)
More than one gene controls the colour of the skin
Answer:
(a) A dominant allele cannot fully hide the allele of the recessive trait.
(b) Polygenic inheritance
OR
B. The hybridisation experiment conducted considering the trait of the height is depicted in the illustration. Ob-serve the illustration and answer the qustions given below.
(a) Write the dominant and recessive trait.
(b) What are the inferences made by Mendel from this hybridisation experiment?
Answer:
(a) dominant trait – Tall Recessive trait – Dwarf
(b) A trait is controlled by two factors.
When a pair of contrasting traits is subjected to hybridisation, only one of the contrasting traits is expressed in the offspring of the first generation and the other remains hidden. The trait that ap-pears in the first generation is called dominant trait and the hidden trait is called recessive trait. The trait hidden in the first generation reappears in the second generation.
Question 6.
Write reason.
Flowering in plants.
Answer:
Phytochrome, a light-sensitive pigment, plays a ma-jor role in photoperiodism. Phytochrome is synthe-sized in the fully developed leaves at the shoot apex. These leaves, perceive the length of day and night through phytochrome and transmit a signal to the shoot apical meristem to induce flowering. As a re-sult of this, genes that control flowering is stimu¬lated.
Question 7.
Didn’t you read the news report?
“Kollam: About 20 more bodies of those who died in the Paravoor Firing incident were identified through DNA testing and handed over to their relatives.”
a) What is the basis of a DNA test?
b) How is it possible to identify relations through the DNA test?
Answer:
(a) The arrangement of nucleotides in the DNA differs in different individuals
(b) The arrangement of nucleotides among close relatives have many similarities.
Question 8.
Observe the figure an answer the questions given below.
(a) Identify the white blood cell.
(b) What is the function of this white blood cell?
Answer:
(a) Neutrophil
(b) It engulfs and destroys bacteria, produces chemi-cals against pathogens.
Question 9.
Select the correct statements from the ones given below.
(A) Synthetic gibberellins are used to promote rooting in stem cuttings.
(B) Synthetic auxins are also used as weedicides.
(C) Synthetic ethylene is used for stem elongation in sugarcane.
(D) Synthetic auxins are used to promote rooting in stem cuttings.
(E) Synthetic gibberellins are used to increase fruit size in grapevines.
(F) Ethylene is used to ripen fruits like bananas and tomatoes simultaneously.
Answer:
(B) Synthetic auxins are also used as weedicides.
(D) Synthetic auxins are used to promote rooting in stem cuttings.
(E) Synthetic gibberellins are used to increase fmit size in grapevines.
(F) Ethylene is used to ripen fruits like bananas and tomatoes simultaneously
Question 10.
Some terms related to Recombinant DNA Technology is given below. Explain each with suitable example.
(a) Genetic glue
(b) Vector
Answer:
(a) Genetic glue – The enzyme that joins two DNA segments. Eg. Ligase
(b) Vector – It carries the genes to a host cell. Eg – Plasmids, which are the circular DNA in bacteria, and some viruses are used as gene vectors.
Question 11.
A. Observe the logo and answer the questions given below.
(a) Identify the logo
(b) What is the goal of this scientific initiative?
Answer:
(a) Human Genome Project (HGP)
(b) Completely understanding the information in the human genome.
OR
B. What are the findings of HGP?
Questions from 12 to 17 carry 3 scores each.
Answer:
The exact sequence of 300 crore base pairs in the human genome. Humans have 20,000 to 25,000 genes. Functional genes make up approximately 1-2% of human genome. The remaining bulk part is known as ‘junk DNA’.
Questions from 12 to 17 carry 3 scores each. (6 × 3 = 18 scores)
Question 12.
Observe the figure and answer the questions given below.
(a) Identify the disease.
(b) What is the cause of this disease.
(c) How the deformed red blood cells affects our body?
Answer:
(a) Sickle cell anaemia
(b) Defect of the gene that controls the production of haemoglobin
(c) Red blood cells become sickle-shaped. Their oxygen-carrying capacity decreases.
The deformed red blood cells get stuck in capil-laries and block blood flow.
Question 13.
Observe the illustration and answer the questions given below.
a) Identify the parts indicated as A, B, C, D.
b) How the part indicated as B is formed?
Answer:
(a) A- Histone protein B – Histone Octamer C-Nucleosome D – Centromere
(b) DNA and histone proteins are the primary components of a chromosome. Eight histone proteins join together to form a histone octamer. DNA strands wind around this octamer to form a structure called nucleosome.
Question 14.
A. Observe the figure given below and answer the question.
a) Identify A, B
b) Which is the pigment in A?
c) Which is the eye disorder related to B?
Answer:
(a)
A – Rod cells
B – Cone cells
(b) Rhodopsin
(c) Colour blindness
OR
B. “Allow anyone to take my eyes after my death”. These are the words of Raju, who was admitted to the hospital after a serious accident.
a) How will you react to this statement?
b) Is it difficult to donate eyes after death?
c) Is it possible to donate an organ while alive?
Answer:
(a) Raju is a noble and kind hearted person because Eye donation is a noble deed, as it brings happiness into the dark life of a blind person.
(b) No, Eyes can be removed within 6 hours and transplanted to the patient by surgery.
(c) Certain organs like, kidney, liver can be donated by a live donor.
Question 15.
Complete the flowchart filling the blanks:
Sound waves → A → Tympanum → B → C → D↓
Hearing ← F ← Auditory nerve ← Impulse ← E ↵
Answer:
A. Pinna
B. Ear ossicles
B. Oval window
D. Cochlea
E. Hair cells
F. Cerebrum
Question 16.
School science club is preapring a poster against the spreading of Amoebic encephalitis. What are the ideas that can be included in this poster ( Hint: pathogen, entry of pathogen in human body, prevention)
Answer:
Amoebic encephalitis is caused by an amoeba called Naegleria fowleri. It is mainly found in stagnant and warm fresh water. Infection occurs when contami-nated water enters the nose and the pathogens reach the brain through the nose. Therefore, the health department has informed that this disease can be prevented by avoiding bathing in or washing the face with stagnant and dirty waterbodies.
Question 17.
A. a) Complete the flowchart showing the blood clotting
b) Blood clotting is a defence mechanism to prevent the loss of blood through wounds. Mention the different stages of this process.
Answer:
a) A-Thrombin,
B – Fibrin
b) Stages of blood clotting:
a) When an injury occurs, the platelets and damaged tissues at the site produce an enzyme called thromboplastin. This converts a protein in the blood plasma called prothrombin into thrombin.
b) Thrombin then converts an inactive protein called fibrinogen into fibrin.
c) The fibrin forms a network of fibres that traps red blood cells, forming a blood clot.
d) This clot prevents further blood loss until the wound is healed.
OR
B. Identify the plant hormone that perform the following functions.
a) flowering and growth of leaves
b) ripening of fruits
c) dropping of leaves and fruits
d) growth of terminal bud.
Answer:
(a) Gibberelline
(b) Ethylene
(c) Abscisic acid/ ethylene in excess amount.
(d) Auxin
The 18th question carries 4 scores (1 × 4 = 4 scores)
Question 18.
A. Tabulate the following activities based on the tupe of nervous system that controls and given proper headings.
(a) Recognizes small of flower
(b) Taking decisions at the emeigency situations.
(c) Rate of heartbeat increases at times of crisis
(d) Production of hormone decreases after overcoming the crisis
Answer:
A. (a) Central nervious system
(b) Autonomous nervious system
(c) Sympathetic nervous system
(d) Parasympathetic nervious system B.
OR
B. Draw the diagram and label the following parts:
(a) The part that helps in the maintenance of homeostasis.
(b) That which acts as relay station of impulses to and from the cerebrum.
(c) The second largest part of the brain.
Answer:
(a) Hypothalamus
(b) Thalamus
(c) Cerebellum