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प्रश्न
Two green plants are kept separately in oxygen-free containers, one in the dark and the other in continuous light. Which one will live longer? Give reasons.
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उत्तर
As plants emit CO2 during breathing, plants kept under constant light survive longer. In the case of plants maintained in the dark, CO2 causes a shortage of oxygen, causing the plant to die sooner.
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संबंधित प्रश्न
How is the amount of urine produced regulated?
State the exact location of the Loop of Henle.
The given diagram represents a nephron and its blood supply. Study the diagram and answer the following questions:
(i) Label parts 1, 2, 3 and 4.
(ii) State the reason for the high hydrostatic pressure in the glomerulus.
(iii) Name the blood vessel which contains the least amount of urea in this diagram.
(iv) Name the two main stages of urine formation.
(v) Name the part of the nephron which lies in the renal medulla.
Write the functions of Ureter.
Name an animal which absorbs oxygen through its moist skin.
In which of the following are the largest amounts of nitrogen excreted from a mammalian body?
(a) breath
(b) sweat
(c) urine
(d) faeces
Write True (T) or False (F) for the following statement. Rewrite the false statement in the correct form.
Excess sugar in the blood is a symptom of diabetes.
Tick the most appropriate answer.
Quinine is used in the treatment of
Differentiate between
excretion and transpiration
Answer the following in detail.
Explain the process of transpiration. Describe some factors that affect it.
Name the following:
The tuft of capillaries inside the Bowman's capsule.
Name the following:
The vein in which urea concentration is maximum
Given below is a simplified diagram of the human kidney cut open longitudinally. Answer the questions that follow.
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- Define excretion.
- Why does the cortex of the kidney show a dotted appearance?
- Why does the medulla of the kidney show a striped appearance?
- Write two differences in the composition of the blood flowing through the blood vessels 'A' and 'B'.
Choose the correct answer:
What happens if one kidney is removed from the body of human being?
The following diagram represents a mammalian kidney tubule (nephron) and its blood supply.
Parts indicated by the guidelines 1to 8 are as follows:
1. Afferent arteriole from renal artery
2. Efferent arteriole
3. Bowman's capsule
4. Glomerulus
5. Proximal convoluted tubule with blood capillaries
6. Distal convoluted tubule with blood capillaries
7. Collecting tubule
8. U-shaped loop of Henle
Study the diagram and answer the question that follow:
Where is most water reabsorbed ?
Answer the following question.
Why do we get bad breath after eating garlic or raw onion?
Identify the INCORRECT match.
Plants use completely different process for excretion as compared to animals. Which one of the following processes is NOT followed by plants for excretion?
“All plants give out oxygen during the day and carbon dioxide during the night”. Do you agree with this statement? Give a reason.
Name the organs that store and release the urine.
