ICSE 2019 - SOLVED Class 10 Biology Question Paper

SOLVED Class-10 Biology Question Paper - ICSE 2019

The Science Paper-3 (BIOLOGY) carried total of 80 marks and was divided into two sections, each carrying 40 marks. 

From Section-I, all questions had to be answered whereas from Section-II, any 4 questions could be attempted.

Total time given to solve the paper was 2 hours. 

General Instructions:

• Answers to this paper must be written on the paper provided separately. 
• You will not be allowed to write during the first 15 minutes. 
• This time is to be spent in reading the question paper. 
• The time given at the head of the paper is the time allowed for writing the answers.

ICSE 2019: Given below is an experimental set-up to demonstrate a particular tropic movement in germinating seeds.

ICSE 2019:

Q. Given below is an experimental set-up to demonstrate a particular tropic movement in germinating seeds. Study the diagram and answer the questions that follow: [5 marks]

 (i)  Label the parts 1 and 2.

(ii) Name the tropic movement shown by part 1.

(iii) Part 1 is affected by two stimuli. Name them. Which one of the two is stronger?

(iv) What is thigmotropism? Give one example.

(v) What is meant by ‘positive’ and ‘negative’ tropic movements in plants?

Solution:

ICSE 2019: Given below is a diagram representing a stage during mitotic cell division (Animal Cell).

ICSE 2019:

Q. Given below is a diagram representing a stage during mitotic cell division. Study the diagram and answer the following questions. [5 marks]

(i) Identify the stage by giving a suitable reason.

(ii) Is it a plant or an animal cell? Give a reason to support your answer.

(iii) Draw a neat, labelled diagram of the stage which follows the one shown in the

diagram.

(iv) How many chromosomes will each daughter cell have after the completion of the

above division?

(v) Name the four nitrogenous bases.

Solution: 

ICSE 2019: Study the picture given below and answer the following questions: Identify the type of pollution

ICSE 2019:

Q. Study the picture given below and answer the following questions: [5 marks]

(i) Identify the type of pollution.

(ii) Name one pollutant that causes the above pollution.

(iii) Mention the impact of this pollution on human health.

(iv) State one measure to control this pollution.

(v) What is a ‘pollutant’? Explain the term.

Solution: 

ICSE 2019: Given below is an apparatus which was set up to investigate a physiological process in plants.

ICSE 2019:

Q. Given below is an apparatus which was set up to investigate a physiological process in plants. The set-up was placed in bright sunlight. Answer the questions that follow: [5 marks]

(i) Name the process being studied. Define the process.

(ii) Why was the pot enclosed in a rubber sheet?

(iii) Mention two external factors which can accelerate the above process.

(iv) List two adaptations in plants to reduce the above process.

(v) Draw a neat, labelled diagram of a stomatal apparatus.

Solution: 

ICSE 2019: The diagram given below represents a system in the human body.

ICSE 2019:

Q. The diagram given below represents a system in the human body. Study the diagram and answer the following questions: [5 marks]

(i) Identify the system.

(ii) Label the parts marked 5 and 6.

(iii) Name the two hormones secreted by 1.

(iv) Mention the number and the name of the part involved in fertilisation and implantation from the above diagram.

(v) Mention the surgical methods of contraception in

1. Human males    2. Human females

Solution: 

ICSE 2019: In Mendel's experiments, tall pea plants (T) are dominant over dwarf pea plants (t)

ICSE 2019:

Q. In Mendel's experiments, tall pea plants (T) are dominant over dwarf pea plants (t). [5 marks]

(i) What is the phenotype and genotype of the F1 generation if a homozygous tall plant is

crossed with a homozygous dwarf plant?

(ii) Draw a Punnett square board to show the gametes and offspring when both parents

are heterozygous for tallness.

(iii) What is the phenotypic ratio and genotypic ratio of the above cross in (ii)?

(iv) State Mendel’s Law of Dominance.

(v) What is a dihybrid cross?

Solution: 

ICSE 2019: The diagram given below represents an endocrine gland in the human body.

ICSE 2019:

The diagram given below represents an endocrine gland in the human body. Study the diagram and answer the following questions: [5 marks]

(i) Identify the endocrine gland. Where is it located?

(ii) Why is the above gland referred to as the ‘master gland’?

(iii) Name the hormone which in deficiency causes diabetes insipidus. How does this

disorder differ from diabetes mellitus?

(iv) Explain the term ‘hormone’. What is the role of tropic hormones in the human body?

(v) Which lobe of the above gland secretes

1. Oxytocin    2. ACTH    3. Growth hormone

Solution: 

ICSE 2019: The diagram given below represents an organ system in the human body.

ICSE 2019:

(a) The diagram given below represents an organ system in the human body. Study the same and answer the questions that follow: [5 marks]

(i) Identify the system.

(ii) Label the parts marked 2 and 4. Mention the function of part 5.

(iii) Name the structural and functional units of the part marked 1.

(iv) What is the fluid that accumulates in part 3? Which is the main nitrogenous waste present in it?

(v) Draw a neat, labelled diagram showing the longitudinal section of part 1.

Solution: 

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis.

ICSE 2019:

(a) The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow. [5 marks]

(i) Name the factor studied in this experiment.

(ii) What will you observe in the experimental leaf after the starch test?

(iii) Explain the process of photosynthesis.

(iv) Give a balanced chemical equation to represent the process of photosynthesis.

(v) Draw a neat, labelled diagram of an experimental set-up to show that oxygen is released during photosynthesis.

Solution: