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Answer the following question.
Express the process of pollination in Vallisneria.
Concept: Pollination
Differentiate between geitonogamy and xenogamy (allogamy).
Concept: Pollination
Answer the following question.
Write the difference in the characteristics of the progeny produced as a result of the two processes.
Concept: Pollination
Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.
Concept: Pollination
Answer the following question.
When a seed of orange is squeezed, many embryos, instead of one are observed. Explain how it is possible.
Concept: Polyembryony
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
Concept: Pollination
Emasculation and bagging are the two important steps carried during artificial hybridization to obtain superior varieties of desired plants. Explain giving reasons, in which types of flowers and at what stages are the two processes carried out.
Concept: Artificial Hybridization or Artificial Fertilization
State what is apomixis. Write its significance. How can it be commercially used?
Concept: Polyembryony
- Nucellus
- Antipodals
- Synergids
- Micropyle
Concept: Pollination
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by ______.
Concept: Pollination
Assertion: Apomictic embryos are genetically identical to the parent plant.
Reason: Apomixis is the production of seeds without fertilization.
Concept: Apomixis
Trace the development of a megaspore mother cell to the formation of a mature embryo sac in a flowering plant.
Concept: Development of Female Gametophyte or Embryo Sac
The wall layer of microsporangium, which nourishes the pollen grain, is ______.
Concept: Microsporogenesis
Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.
Concept: Menstrual Cycle (Ovarian Cycle)
Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.
Concept: Menstrual Cycle (Ovarian Cycle)
How is 'oogenesis' markedly different from 'spermatogenesis' with respect to the growth till puberty in the humans?
Concept: Gametogenesis
Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.
Concept: Gametogenesis
When and where do chorionic villi appear in humans?
Concept: Pregnancy and Embryonic Development
Draw a diagrammatic sectional view of the female reproductive system of human and label the parts
(i) where the secondary oocytes develop
(ii) which helps in collection of ovum after ovulation
(iii) where fertilization occurs
(iv) where implantation of embryo occurs.
Concept: The Female Reproductive System
Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females
Concept: Menstrual Cycle (Ovarian Cycle)
