Biology
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions:
(i) Name the process intended for study.
(ii) Define the above mentioned process.
(iii) When the weight of the test tube (A & B) is taken before and after the experiment, what is observed? Give reasons to justify your observation in A & B.
(iv) What is the purpose of keeping the test tube B in the experimental setup?
Answer
(i) Transpiration.
(ii) Transpiration is the process in which water is lost in the form of vapour from the aerial parts of the plant.
(iii) Weight of test tube A before the experiment was more than its weight after the experiment. This is because water from test tube A has evaporated due to transpiration.
Weight of test tube B remains the same before and after the experiment, because no loss of water occurs in test tube B as there is no plant and the oil on the surface prevents direct evaporation of water.
(iv) It is a control experiment where the purpose of using test tube B is to compare the level of water in both test tubes.
Related Questions
Given below are six sets with four terms each. In each set one term is odd and cannot be grouped in the same category to which the other three belong. Identify the odd one in each set and name the category to which the remaining three belong. The first one has been done as an example. Example: Calyx, Corolla, Stamens, Midrib
Odd term: midrib
Category: Parts of a flower(i) Haemoglobin, Glucagon, Iodopsin, Rhodopsin
(ii) Urethra, Uterus, Urinary bladder, Ureter
(iii) Transpiration, Photosynthesis, Phagocytosis, Guttation
(iv) Cyton, Photon, Axon, Dendron
(v) Oxytocin, Insulin, Prolactin, Progesterone
Choose the correct answer from the options given below:
Cretinism and Myxoedema are due to
- Hypersecretion of thyroxin
- Hypersecretion of growth hormone
- Hyposecretion of thyroxin
- Hyposecretion of growth hormone
Copy and complete the following by filling in the blanks 1 to 5 with appropriate words:
The human female gonads are ovaries. A maturing egg in the ovary is present in a sac of cells called …………… (1). As the egg grows larger, the follicle enlarges and gets filled with a fluid and is now called the …………… (2) follicle. The process of releasing the egg from the ovary is called …………… (3). The ovum is picked up by the oviducal funnel and fertilisation takes place in the …………… (4). In about a week, the blastocyst gets fixed in the endometrium of the uterus and this process is called …………… (5).
Match the items given in Column A with the most appropriate ones in Column B and rewrite the correct matching pairs from Column A and Column B:
Sl. No. Column A Column B 1 Pituitary gland Testosterone 2 Sulphur dioxide Calcium 3 Seminiferous tubules Growth hormone 4 Clotting of blood Acid rain 5 Guttation Sperms Global warming Magnesium Hydathodes