B. Using the illustrations above, arrange the following statements to explain the process of pollen formation in angiosperms. Use numbers 1 (first) to 7 (last). Microgametogenesis _4. The generative cell subsequently detaches from the pollen grain wall and is engulfed by the vegetative cell forming a unique 'cell within a cell' structure. _5. Each microspore will form large vacuole displacing the microspore nucleus to an eccentric position against the microspore wall. _6. The nucleus undergoes first pollen mitosis which results in the formation of two unequal cells, a large vegetative cell and a small generative cell each containing a haploid nucleus. _7. The generative cell divides by mitosis to form two sperm cells completely enclosed within the vegetative cell cytoplasm. _8. No cytokinesis takes place forming a pollen grain having 3 haploid nucleus, 1 tube nucleus and 2 sperm cells for double fertilization. Microsporogenesis _9. A diploid sporogenous cells differentiate as microsporocytes (pollen mother cells or meiocytes) which divide by meiosis to form four haploid nuclei. 10. Distinct single-celled haploid microspores form after cytokinesis.

VOLTE1¹67 3:41fb. : +91 97532 46070 21 जुलाई, शाम 5:38 → Class XII 1. Draw a 2. Explain 7. Seed (B) Fruit Jawahar Navodaya labelled Subject: Biology laya Vidyalaya Buranabad ujjain -2 diagram of Embryo Insects. sac 2and microsporagium. Megasporogeneris. Pollen grains Embryo Development. by Pollination. 3. Draw a labelled diagram of female reproductory system. 4. List hormones of pregnancy and their role. 5. Project Report (Topic given) 6. Make a Chart / Model from any, subject or topic. from Chapter 2 and 3. on Do survey diffcunt pollinating Agent within your Economic valuu. ⇓ C. 4. O ט

21) How does a seed differ from a spore? Group of answer choices A seed has a protective coating, while a spore does not A seed must start growing right away, while a spore can lie dormant through adverse environmental conditions A spore has a protective coating, while a seed does not A spore contains an embryo, while a seed contains just a single cell A seed contains a food reserve, while a spore does not

10: Name the structures that surround the Angiosperm ovule, as indicated by the pointers.