QUESTIONS FROM STATE BOARD EXAMINATIONS:
In many grasses, seeds are formed only after fertilization. There are reports that, in some grasses seeds are formed without fertilization. Explain the phenomenon.

QUESTIONS FROM STATE BOARD EXAMINATIONS : Many ovules are present in ovary of:

QUESTIONS FROM CBSE BOARD EXAMINATIONS : Which are the nuclei that fuse to form endosperm?

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : Fertilization is essential for production of seed, but in some angiosperms seeds develop without fertilization. (i) Give an example of an angiosperm that produces seeds without fertilization. Name the process. (ii) Explain the two ways by which seeds develop without fertilization.

QUESTIONS FROM CBSE BOARD EXAMINATIONS : Identify the type of flower shown in A and B. Which out of the two will produce an assured seed set.

QUESTIONS FROM CBSE BOARD EXAMINATIONS : What is the fate of haploid megaspores formed by megaspore mother cell in an angiospermic plant?

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 : 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.

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) Draw a labelled diagram of the sectional view of a typical anatropous ovule. (b) Mention the fate of all the components of the embryo sac after fertilization.

Short Answer Questions Three mark Each QUESTION FROM STATE BOARD EXAMINATIONS (a)Write the characteristic features of anther, pollen and stigma of wind pollinated flowers. (b) How do flowers reward their insect pollinators? Explain.