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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Science Test1.
Luteal phase of the menstrual cycle is also called the secretory phase. Give reason.
2.
How does developing embryo gets its nourishment inside the mother's body?
3.
What is colostrum? How is milk production hormonally regulated?
4.
Write the characteristics of insect pollinated flowers.
5.
How does binary fission differ from multiple fission?
1.
(i) Corpus leuteum produces progestrone and its level increases followed by a decline if menstrual bleeding occurs.
(ii) Uterine wall ruptures bleeding starts and infertilized egg is expelled.
2.
(i) The placenta is a disc shaped structure attached to the uterine wall and is a temporary association between the developing embryo and maternal tissues.
(ii) It allows the exchange of food materials, diffusion of oxygen, excretion of nitrogenous wastes and elimination of carbon dioxide.
(iii) A cord containing blood vessels that connects the placenta with the foetus is called the umbilical cord.
3.
(i) The first fluid which is released from the mammary gland after child birth is called as colostrum.
(ii) Milk production from alveoli of mammary glands is stimulated by prolactin secreted from the anterior pituitary.
(iii) The ejection of milk is stimulated by posterior pituitary hormone oxytocin.
4.
(i) Insect pollinated plants characters are brightly coloured, have smell and nectar.
(ii) The pollen grains are larger in size the exine is pitted and spiny.
(iii) So they can be adhered firmly on the sticky stigma.
5.
| S.No | Binary fission | Multiple fission |
| i) | Two daughter cells are produced from a single parent cell. |
Two or multiple daughter cells are produced from a single parent cell. |
| ii) | Cytoplasm divides after each nuclear division. |
Cytoplasm does not divide after each nuclear division. |
| iii) | It occurs in favourable conditions. | It occurs in unfavourable conditions. |
10th Standard Syllabus & Materials
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
