Question
The thyroid gland is called as nature gland.
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Answer
The thyroid gland is also called as nature gland because it secretes thyroxin hormone which is mainly responsible for the normal behaviour of human beings. In adequate supply of hormones human behaviour remains normal. In case of excess supply of hormones in the blood there are increased metabolic activities, raised nervous excitability and increased physical activity accompanied by fatigue and loss of weight.
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Given below is an apparatus used to study a particular process in plants. Study the same and answer the questions that follow :
(i) Name the apparatus.
(ii) Mention one limitation of this apparatus.
(iii) Which phenomenon is studied with the help of this apparatus?
(iv) What is the function of the part marked ‘reservoir’?
(v) What is the role of the air bubble in the experiment?
(i) Name the apparatus.
(ii) Mention one limitation of this apparatus.
(iii) Which phenomenon is studied with the help of this apparatus?
(iv) What is the function of the part marked ‘reservoir’?
(v) What is the role of the air bubble in the experiment?
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Hormone and Enzyme
Hormone and Enzyme
In the figure below ‘A’ shows a cell in the normal state and ‘B’ shows the same cell after leaving it in a certain solution for a few minutes.
(i) Describe the change which has occurred in the cell as seen in B.
(ii) Give the technical term for the condition of the cell as reached in B and as it was in A.
(iii) Define the process which led to this condition.
(iv) What was the solution-isotonic, hypotonic or hypertonic, in which the cell was kept?
(v) How can the cell in B, be brought back to its original condition?
(vi) Name the parts numbered 1 to 3.
(i) Describe the change which has occurred in the cell as seen in B.
(ii) Give the technical term for the condition of the cell as reached in B and as it was in A.
(iii) Define the process which led to this condition.
(iv) What was the solution-isotonic, hypotonic or hypertonic, in which the cell was kept?
(v) How can the cell in B, be brought back to its original condition?
(vi) Name the parts numbered 1 to 3.
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(i) Label the parts indicated by the guidelines 1 to 8.
(ii) How does the uterus prepare for the reception of a zygote?
(iii) What happens to the uterus if fertilization takes place?
(iv) What happens to the uterus if fertilization has failed to take place?
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(ii) How does the uterus prepare for the reception of a zygote?
(iii) What happens to the uterus if fertilization takes place?
(iv) What happens to the uterus if fertilization has failed to take place?
Give Reasons
Gametes have a haploid (n) number of chromosomes.
Gametes have a haploid (n) number of chromosomes.
G1 phase and G2 phase
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(ii) How are the waste products of a fetus removed?
(iii) What is the gestation period?
(i) Write the functions of the placenta, amnion, and umbilical cord.
(ii) How are the waste products of a fetus removed?
(iii) What is the gestation period?
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(i) Name the region in the kidney where the shown structure is present?
(ii) Name the parts labeled 1, 2,3, and 4.
(iii) Name the stages involved in the formation of urine.
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(ii) Name the parts labeled 1, 2,3, and 4.
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(iv) What is the technical term given to the process occurring in 2 and 3?
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