In this article, I am giving solutions to all questions of ICSE Board's latest March 2019 Biology question paper. These solutions will give the students to know the pattern of answering as well as to prepare themselves for their upcoming Board's exams. Students can get benefited by revising these questions which will help them to improve their skills in answering questions.
Correct and rewrite the statements by changing the biological term that is underlined for each statement:-
The theory of Inheritance of Acquired Characters was proposed by Jean Baptiste Lamarck.
The protective sac which develops around the developing embryo is called the Amnion.
Maintaining balance of the body and coordinating muscular activities is carried out by Cerebellum
The kidney is composed of number of Nephrons
The part of the eye which can be donated from a clinically dead person is the Cornea.
Give suitable biological reasons for the following statements:-
The birth rate in India is very high. Ans. The birth rate in India is very high because of illiteracy among the people, religious beliefs, desire for a male child in the family, etc.
Carbon monoxide is dangerous when inhaled. Ans. Carbon monoxide is dangerous when inhaled because of Carbon monoxide forms a stable compound with hemoglobin which deprives the oxygen carrying capacity of hemoglobin.
Root hairs become flaccid and droop when excess fertilizers are added to the moist soil around them. Ans. Root hairs become flaccid and droop because of root hairs lose water to outside concentrated fertilizer solution by exosmosis.
Acid rain is harmful to the environment. Ans. Acid rain is harmful to the environment because of acid rains damage to aquatic life, damage monuments, destroy crops, etc
All life on Earth is supported by Photosynthesis. Ans. All life on Earth is supported by Photosynthesis because green plants prepare food by photosynthesis and provide food to all living beings either directly or indirectly.
Match the terms from Column A with Column B:-
Cranial nerves ------------>12 pairs
Leydig cells --------------->Testosterone
Spinal nerves--------------->31 pairs
Choose the correct answer from the four options given below;-
D. Either X or Y chromosome
C.14 th day
D.Age of the plant
Choose the Odd one out of the following terms given and name the Category to which other belong:-
Odd one:-Leukemia; Category:-Defects of hormonaql imbalance
It is Pituitary gland. It hangs from the base of mid-brain below hypothalamus.
Pituitary gland is known as Master gland because the secretions of the pituitary gland will control the secretions of other endocrine glands.
Hyposecretion of Vasopressin or ADH hormone from the posterior lobe of pituitary will cause Diabetes insipidus. In Diabetes insipidus, frequent urination occurs with excess loss of water. But in Diabetes insipidus, frequent urination occurs with the loss of glucose. This disorder occurs due to hyposecretion of insulin from pancreas.
A hormone is a chemical messenger which is secreted at one part of our body and it will have its influence at some other parts of the body. Tropic hormones are the hormones which stimulate the secretions of some other endocrine glands. For example, Thyroid Stimulating Hormone (TSH) secreted by the Pituitary gland will stimulate the secretion of Thyroid gland.
Oxytocin:-This hormone secreted from the posterior lobe of the pituitary. ACTH:-This hormone secreted from the anterior lobe of the pituitary. Growth hormone:-This hormone is secreted from the anterior lobe of pituitary.
Diagram based question:-
Transpiration. Transpiration:-The evaporative loss of water through the aerial parts of the plant is known as transpiration.
The pot enclosed in a rubber sheet to prevent the escape of water vapor from the moist soil into bell jar.
The two external factors which accelerate the transpiration is wind velocity/high temperature/dry atmosphere.
Presence of thick cuticle over the surface of leaves/loss of leaves/narrow leaves/sunken stomata
Stomatal Apparatus (Open and Closed) diagram:-
(Image by author)
A. Neanderthal man; B. Australopithecus.
Australopithecus men:-Chin was absent/eyebrow ridges projected over the eyes. Neanderthal man:-large forehead/prominent brow ridges/less hair on the body.
The theory of Natural Selection was proposed by Charles Darwin.
The organism mentioned in relation to industrial melanism is moth Biston betularia
Two examples of vestigial organs:-Vermiform appendix, a finger-like projection present between the small intestine and large intestine/ wisdom teeth in humans/Pinna in humans
Question on Mendel's experiment:-
In F1 generation all the plants obtained are phenotypically are Tall and genotypically are mixed tall (Tt).
Law of dominance:-Every character is influenced by a pair of factors. Of the two factors, the factor that get expressed is said to be dominant and the factor that get suppressed is said to be recessive. This is known as the law of dominance.
A cross made between two parent plants taking into account two pairs of contrasting features at a time.
Diagram based question:-
The stage shown in the diagram is Anaphase. The reason for this is, the chromatids of each chromosome is moving towards the opposite poles of the cell.
It is an animal cell. The reason is asters are found in the cell/cell wall is absent
Telophase Stage in Mitosis:-
(Image by author)
Each cell will have 4 chromosomes after cell division.
The four nitrogenous bases are Adenine, Thymine, Guanine, Cytosine.
In brain, the cytons of the neurons which form the grey matter is situated in the outer region but in the spinal cord the cytons are arranged in the inner region. The axons of the neurons which form the white matter are situated in the inner region but in the spinal cord in the outer region.
Dynamic balance of human ear is balanced by ampullae of semicircular canals. Static balance is maintained by sacculus and utriculus of semicircular canals.
Light adaptation:-Adjustment of our eyes to see objects in bright light is known as light adaptation. When we move from dark area bright light, rods present in the retina get bleached and cones start functioning. Next, the size of the pupil becomes constricted as you are seeing the object in the bright light. These two changes are required to see objects in bright light. Dark adaptation:-When we enter from bright light to dark area, the cones stop functioning and the rods generate rhodopsin pigment. Similarly, the size of the people gets dilated as we are seeing the object in the darkroom.
Development of fruits without the act of fertilization is known as Parthenocarpy. Ex:-Banana fruits are formed without the act of fertilization. Seedless grapes and watermelons are produced through induced parthenocarpy.
Objectives of Swachh Bharat Abhiyan:-Elimination of open defecation/Eradication of manual scavenging/promoting modern solid waste management
Human Female reproductive system
Part 5 is Oviducal funnel/Funnel of the oviduct and part 6 is cervix
Oestrogen and Progesterone
Part involved in fertilization is oviduct and the part involved implantaion is endometrium region of uterine wall.
Surgical method followed in human male is Vasectomy and in female is Tubectomy.
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