The given figure shows the pathway of a nerve impulse in a reflex action. Which part serves as a link between neurons?
Important Questions on Life Processes
Study the given experimental set-up.
By measuring the movement of the oil drop in the apparatus, what can be investigated?
Match column I with column II and select the correct option from the codes given below.
| Column - I | Column II | ||
| (a) | Calcitonin | (i) | Pancreas |
| (b) | Glucagon | (ii) | Ovaries |
| (c) | Progesterone | (iii) | Adrenal glands |
| (d) | Corticosteroid | (iv) | Thyroid gland |
| (e) | Prolactin | (v) | Pituitary |
| (vi) | Parathyroid gland |
Absorption of light energy by chlorophyll.
Conversion of light energy to chemical energy and splitting of carbon dioxide into carbohydrates and oxygen.
Reduction of carbon dioxide to carbohydrates.
Conversion of chemical energy to radiant energy and splitting of water molecules into hydrogen and oxygen.
Which of the following statements are correct regarding the given figure?
(i) The parts labelled as Q and R carry blood having low oxygen concentration.
(ii) The parts labelled as P, Q and R carry blood having low oxygen concentration.
(iii) The blood flows out of the heart through blood vessel Q when ventricle contracts.
(iv) The blood is flowing out of the heart through blood vessel Q when atria contract.
The given graph shows changes in the air pressure of lungs during breathing. What causes the change in air pressure during period X?
The given graph shows the changes in the volume of the lungs of a person at rest over a period of 20 seconds.
How many breaths per minute is the person taking when at rest?
Which two points in the graph (C, D, E or F), shows inspiration and expiration?
The thyrotropin releasing hormone (TRH) from the stimulates the to secrete the thyroid stimulating hormone (TSH), which in turn stimulates the thyroid gland to secrete thyroxine. A amount of thyroxine in the blood exerts effect on so that TRH and TSH are produced. This eventually the amount of thyroxine. It is called feed back control.
Select the option that correctly fills up the blanks in the above passage.Refer to the following figure of phloem tissue.
Which of the following statements correctly describes the relationship between cells Y and Z?
