Biology
Given alongside is an apparatus which was set up to investigate a physiological process in plants. The setup was placed in bright sunlight. Answer the questions that follow :
(i) Name the process being studied. Define the process.
(ii) Why was the pot enclosed in a rubber sheet?
(iii) Mention two external factors which can accelerate the above process.
(iv) List two adaptations in plants to reduce the above process.
(v) Draw a neat, labelled diagram of a stomatal apparatus.
Answer
(i) The process being studied is Transpiration. Transpiration is the process during which water is lost in the form of water vapour through aerial parts of the plant.
(ii) The pot was enclosed in a rubber sheet to prevent evaporation of water from the soil.
(iii) Two external factors which can accelerate Transpiration are:
- Bright sunlight
- Low humidity
(iv) Two adaptations in plants to reduce the above process are:
- Sunken stomata
- Narrow leaves
(v) Stomatal apparatus is shown in the labelled diagram below:
Related Questions
In Mendel's experiments, tall pea plants (T) are dominant over dwarf pea plants (t).
(i) What is the phenotype and genotype of the F1 generation if a homozygous tall plant is crossed with a homozygous dwarf plant?
(ii) Draw a Punnett square board to show the gametes and offspring when both the parents are heterozygous for tallness.
(iii) What is the Phenotypic ratio and genotypic ratio of the above cross in (ii)?
(iv) State Mendel's Law of Dominance.
(v) What is a Dihybrid Cross?
Given below are two stages in the evolution of man. Study them and answer the questions that follow:
(i) Identify Australopithecus and Neanderthal man from the above pictures.
(ii) Mention two characteristic features each for the two stages.
(iii) Who proposed the theory of 'Natural Selection'?
(iv) Name the organism used as an example to explain 'Industrial Melanisum'.
(v) Give two examples of vestigial organs in humans.
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