Long Answer Questions Five mark
QUESTIONS FROM CBSE BOARD EXAMINATIONS :
(a) Asa senior biology student, you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.

Long Answer Questions Five mark Each QUESTIONS FROM STATE BOARD EXAMINATIONS : Describe different types of cross pollination in plants.

Long Answer Questions Five mark Each QUESTIONS FROM STATE BOARD EXAMINATIONS : Differentiate between self and cross pollination. Mention two contrivances of each.

Long Answer Questions Five mark Each QUESTIONS FROM STATE BOARD EXAMINATIONS : Raja a science student observed the structure of mature embryo sac comprising antipodals, central cells and egg apparatus. Explain each one of them.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : (a) Trace the development of megaspore mother cell upto formation of a mature embryo sac in a flowering plant. (b) Draw a labelled diagram of the structure of mature dicot embryo.

Short Answer Questions Three mark Each QUESTION FROM STATE BOARD EXAMINATIONS Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : (a) Explain the different ways apomictic seeds can develop. Give an example of each. (b) Mention one advantage of apomictic seeds to farmers. (c) Draw a labelled mature stage of a dicotyledonous embryo.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : (a) Draw a diagrammatic sectional view of a mature anatropous ovule and label the following parts in it: (i) that develops into seed coat. (ii) that develops into an embryo after fertilization. (iii) that develops into an endosperm in an albuminous seed. (iv) through which the pollen tube gains entry into the embryo sac. (v) that attaches the ovule to the placenta (b) Describe the characteristic features of wind pollinated flowers.

Long Answer Questions Five mark Each QUESTIONS FROM STATE BOARD EXAMINATIONS : Three different flowers are given to you in the practical class: (i) Maize (ii) Vallisneria (iii) Rose You are asked to group them on pollinating agents. Describe the adaptations of each flower related with agents of pollination.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer the following questions giving reasons: (a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil? (b) What would have been the minimum number of ovules present in the ovary? (c) How many megaspore mother cells were involved? (d) What is the minimum number of microspore mother cells involved in the above case? (e) How many male gametes were involved in this case?

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : Give reasons why : (i) most zygotes in angiosperms divide only after certain amount of endosperm is formed. (ii) groundnut seeds are exalbuminous and castor seeds are albuminous. (iii) micropyle remains as a small pore in the seed coat of a seed. (iv) integuments of an ovule harden and the water content is highly reduced as the seed matures. (v) apple and cashew are not called true fruits.