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Study the following statements about the human excretory system. I. The waste materials dissolved in water are separated in the kidney as urine. II. Urine is stored in the bladder. It is passed out through the urethra, the other end of which is attached to the urinary aperture. III. Urine passes into the bladder through the urinary ducts. IV. Useful substances are reabsorbed into the blood. V. Blood containing both useful and harmful substances reaches the kidneys for filtration. The correct sequence of processes given in the above statements is:
Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: Somatic embryogenesis in plants is a twostep process comprising of embryo initiation followed by embryo production.
Reason: Embryo initiation is independent of the presence of 2, 4-dichlorophenoxyacetic acid, whereas embryo production requires a high concentration of 2, 4-dichlorophenoxyacetic acid.
Consider the following statements regarding recurrent type apomixis and choose the correct answer:
1. There is meiosis during the formation of megaspore
2. The embryo sac is diploid in nature
3. The embryo sac never develops from a cell of the archesporium
4. The development of embryo from a cell of an embryo sac other than egg is known as apospory
Consider the following statements and choose the correct answer:
1. In Oenothera type of monosporic embryo sac, the embryo develops from the micropylar megaspore of the tetrad
2. Antipodal cells are altogether absent in Oenothera type
3. The genus Trapa forms an 8-nucleate embryo sac of the Polygonurn type
4. Oenothera type of embryo sac development has been found to be a characteristic feature of the entire family Onagraceae
Consider the following statements regarding poloyembryony and choose the correct answer:
1. False polyembryony includes the development of two or more embryo sacs within the Same nucellus, and the embryos are derived from different embryo sacs
2. In cleavage polyembryony, the zygote instead of giving rise to one embryo produces embryos by cleavage
3. According to Jeffrey (1895), in Erythronium americanum the "embryogenic mass" forms two or three embryos
Which of the following foetal membranes functions as embryonic urinary bladder?
Which of the following are the parts of Human excretory system? a. Kidney b. Urinary Bladder c. Urethra d. Liver
Urine is stored in the urinary bladder until which of the following?
Select the duct which takes the urine out from the urinary bladder to the outside of the body.
The sperms formed in testes are delivered through the ______ which unites with a tube coming from the urinary bladder.