ICSE Biology Sem-2 Answer Key 2022 Solved Board Question Paper Guess Your Marks

ICSE Biology Sem-2 Answer Key 2022, Solved Board Question Paper, Step by step solutions of ICSE Class-10 Biology Question Paper of Sem-2  for 2022 as council prescribe guideline.. Visit official website CISCE for detail information about ICSE Class-10

ICSE Biology Sem-2 Answer Key 2022, Solved Board Question Paper,

Board ICSE
Class 10th (X)
Subject Biology
Topic Semester-2 Answer Key
Syllabus  on bifurcated syllabus (after reduction)
session 2021-22
Question Type  MCQ (Sec- A) and Descriptive (Sec-B)
Total questions 6 With S
Max mark 40

Section A

(Attempt all questions from this section)

Question 1: Choose the correct answer to the questions from the given option. (Do not copy the question. Write the correct answer only.)

(i) The mineral elements in hemoglobin:

(a) Manganese

(b) Iron

(c) Sodium

(d) Calcium

Answer : (b) Iron

(ii) The number of cranial nerves in humas are :

(a) 12

(b) 31 Pairs

(c) 31

(d) 12 pairs

Answer : (d) 12 pairs

(iii) Gigantism and Acromegaly are due to :

(a) Hypersecretion of Growth hormone

(b) Hypersecretion of Thyroxine

(c) Hyposecretion of Growth hormone

(d) Hyposecretion of Thyroxine

Answer : (a) Hypersecretion of Growth hormone

(iv) Pericardium covers the :

(a) Heart

(b) Brain

(c) Spinal cord

(d) Eyeball

Answer : (a) Heart 

(v) The circular opening in the center of iris :

(a) Lense

(b) Cornea

(c) Sclera

(d) Pupil

Answer : (d) Pupil

(vi) The blood vessel that carries oxygenated blood is :

(a) Pulmonary

(b) Pulmonary vein

(c) Renal vein

(d) Hepatic vein

Answer : (b) Pulmonary vein

(vii) Organ of corti is present inside the :

(a) Cochlea

(b) Semicircular canals

(c) Sacculus

(d) Utriculus

Answer : (a) Cochlea

(viii) The structure that stores urine temporarily is :

(a) Uretra

(b) Urethra

(c) Urinary bladder

(d) Kidneys

Answer : (c) Urinary bladder

(ix) Isleta of language are located in :

(a) Liver

(b) Pituitary gland

(c) Spleen

(d) Pancreases

Answer : (d) Pancreases

(x) The main nitrogenous waste formed in the human body :

(a) Uric acid

(b) Urea

(c) Ammonia

(d) Creatinine

Answer : (b) Urea


Section B

(Attempt any three questions from this section)

Question 2 :

(i) Simple goitre is usually seen in people living in the hilly regions. Give two reasons for the statement

(ii) What are the two types of blood circulation in humans?

(iii) Mention the three major steps involved in the production of urine.

(iv) Draw neat diagram of a Neuron and label any two parts.

Answer : 

(i) The people living in hilly regions receive insufficient iodine in their diet due to the fact that they drink iodine deficient water from rivers and streams fed by melting snow. Even their diet has little or no iodine

(ii) Two pathways come from the heart: The pulmonary circulation is a short loop from the heart to the lungs and back again. The systemic circulation carries blood from the heart to all the other parts of the body and back again.

(iii) There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion. These processes ensure that only waste and excess water are removed from the body.

(iv)

myelinated neuron

Question 3 :

(i) What is Adrenal Virilism? What causes this condition?

(ii) Which is the light sensitive layer of the eyeball? Where exactly is the image formed on this layer?

(iii) Study the diagram given below and answer the questions that follow:

 Study the diagram given below and answer the questions that follow:

(a) identify the defect of the eye by mentioning the technical term.

(b) Mention one reason for this defect.

(c) Name the type of lens used to correct this defect.

(iv) Give the biological terms for the three tiny bones present in the middle ear.

Answer : 

(i) Adrenal virilism is a syndrome in which the excessive production of adrenal androgens causes virilization.

The symptoms include excess facial and body hair, deepening of the voice, baldness, acne, and increased muscularity and sex drive

Adrenal virilism is due to an androgen-secreting adrenal tumor or to adrenal hyperplasia. Virilization is more noticeable in women; men may be infertile due to suppressed gonadal function

(ii) the retina , at yellow spot

(iii)

(a) defect of the eye shown is hypermetropia

(b) one reason for this defect.—length of the eye being too short

(c) the type of lens used to correct  defect.—- convex lens

Question 4:

(i) Name the endocrine gland that secretes Thyroxine. Give any one function of Thyroxine

(ii) Give the full form of the abbreviation ACTH Which gland secretes this hormone?

(iii) Define the term Synapse. How are Cytons and Axons of neurons placed in the Cerebrum?

(iv) Name the three membranous coverings of the human brain.

Answer : 

(i) Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland.

main function —- heart and digestive function, metabolism, brain development, bone health, and muscle control.

(ii) adrenocorticotropic hormone

ACTH is a hormone made by the pituitary gland, a small gland at the base of the brain. ACTH controls the production of another hormone called cortisol

(iii) he site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector). A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction. synapse; neuron

Axons are placed in inner portion whereas cytons are placed in outer portion of brain

(iv) Three layers of membranes known as meninges protect the brain and spinal cord. The delicate inner layer is the pia mater. The middle layer is the arachnoid, a web-like structure filled with fluid that cushions the brain. The tough outer layer is called the dura mater

Question 5:

(i) Name the nerve that transmits impulses to the brain from:

(a) Ear

(b) Eye

(ii) A mature mammalian erythrocyte lacks nucleus and mitochondria but is efficient in its functioning. Explain by giving suitable reasons

(iii) The diagram given below is that of a human brain. Answer the questions that follow:

 The diagram given below is that of a human brain. Answer the questions that follow:

(a) Label the parts numbered 2 and 3.

(b) State any one function of the part numbered

(iv) What is a reflex action? Name the two types of reflexes.

 

Answer : 

(i) (a) Ear–auditory nerve.  (b) Eye- Optic Nerve

(ii) A mature erythrocyte lacks nucleus and mitochondria so as to make a place for the accommodation of more hemoglobin and hence more oxygen molecules. Lack of such organelles also provides the peculiar biconcave appearance of RBCs that aids in efficient diffusion

(iii)

(a) Label the parts  2 – cerebellum and 3 medulla

(b)  one function of the part numbered 1 is memory

(iv) A reflex action is an automatic (involuntary) and rapid response to a stimulus, which minimises any damage to the body from potentially harmful conditions, such as touching something hot. Reflex actions are therefore essential to the survival of many organisms.

Name the two types of reflexes – Autonomic and Somatic are two types of reflex arcs. The sensory neuron, motor neuron, receptor, interneuron, and effector organ are the components of the reflex arc.

Question 6:

(i) Give the exact location of Pulmonary semilunar valve. When does it close?

(ii) Name the hormones whose deficiency causes:

(a) Diabetes mellitus

(b) Diabetes insipidus

(iii) Draw a neat diagram of a longitudinal section of a human kidney and label Renal Cortex and Renal Medulla on the diagram.

(iv) Mention one function for each of the following :

(a) Lymphocytes

(b) Thrombocytes

(c) Neutrophils

Answer : 

(i) Pulmonary semilunar valve is located between the right ventricle and the pulmonary artery and has three cusps. It prevents back flow of blood into the right ventricle

they close at the beginning of ventricular diastole (when the risk of backflow first arises). Closing of the semilunar valves produces the second heart sound.

(ii)  (a) Diabetes mellitus-  Insulin  (b) Diabetes insipidus– Vasopressin (ADH)

(iii)

kidney

(iv)

(a) Lymphocytes– antibody production

(b) Thrombocytes– They help form blood clots to slow or stop bleeding and to help wounds heal.

(c) Neutrophils– main action against bacterial and fungal infections

— End of  ICSE Biology Sem-2 Answer Key 2022, Solved Board Question Paper  :-

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