Biology
State the main functions of the following :
(i) Medulla Oblongata
(ii) Cytokinins
(iii) Tears
(iv) Coronary Artery
(v) Seminal Vesicles
Answer
(i) The function of Medulla Oblongata is to control the activities of the internal organs, for example, peristaltic movement of the alimentary canal, movement of breathing, beating of the heart and many other involuntary actions.
(ii) Cytokinins inhibits apical dominance, stimulate cell division and cell elongation and prevent ageing of plant parts.
(iii) The functions of Tears include lubricating the surface of eyes, wash away dust particles, help in killing germs.
(iv) The Coronary Artery delivers blood to the heart muscles.
(v) Seminal vesicles produce a secretion which serves as a medium for transportation of the sperms.
Related Questions
Mention the exact location of the following :
(i) Testis
(ii) Incus
(iii) Thylakoids
(iv) Amniotic fluid
(v) Corpus callosum
The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow :
(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 setup to show that oxygen is released during photosynthesis.
The diagram given below represents an organ system in the human body. Study the same and answer the questions that follow:
(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.
The diagram given below represents an endocrine gland in the human body. Study the diagram and answer the following questions :
(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:
- Oxytocin
- ACTH
- Growth hormone