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Question 1: (a) What remains constant in uniform circular motion?
(b) What changes continuously in uniform circular motion?

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Answer: (a) Speed remains constant in uniform circular motion.
(b) Direction of motion changes continuously in uniform circular motion.
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Uploaded on: 9/11/2022

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Within each pollensac there is a fine, powdery or Microsporogenesis granular mass of cells, called the pollen grains or When anther is young the group of compactly microspores. Pollen grains are produced in large arranged homogenous cells called the sporogenous quantities in the pollen sacs. tissue occupies the centre of each micro7.2.1 Structure of Microsporangium _ sporangium. The formation of microspores or (Pollen Sac) sporogenesis. The cells of sporogenous tissue In a transverse section, a typical microsporangium undergo meiotic divisions to form microspore appears near circular in outline. It is generally tetrads. As the anthers mature and dehydrate, the surrounded by four types of wall laycrs. The microspores dissociate from each other and develop epidermis, endothecium, middle layers and the into pollen grains. As the anthers mature and tapetum. The outer three wall layers perform the dehydrate, the microspores dissociate from each function of protection and help in a dehiscence of other and develop into pollen grains. Inside each anther to release the pollen. * or pollen grains are formed that are released with * Epidermis is single layered and is useful for the dehiscence of anther. protection. It has thin walled stomium present . What is the ploidy of the cells of pollen tetrad? in between the pollensaes of an anther lobe and Ans. Haploid is the site of dehiscence. * Endothecium is the single layered hypodermis of anther wall with hygroscopic thickenings of cellulose and is helpful for dehiscence of anther * Middle layers - 1 to 5 layers. These are consumed by developing microspores. * Tapetum is the innermost nutritive layer with cells having dense cytoplasm and have more Fig. 7.2.4 T.S. of Dithecous anther, than one nucleus. It may be amoeboid (or) Structure of microsporangium secretory type. The cells turn polyploid due to Pollen Grain endomitosis. Q. Can you think of how tapetal cells could Pollen grain represents the male gametophyte. Each become bi or multinucleate? pollen grain or microspore is a unicellular, haploid, Ans.Due to free nuclear divisions. oval or rounded structure. Pollen grains are Tapetum provides nourishment to developing micrometers in diameter. It has two layered wall microspores. It also secretes callase enzyme which exine and intine. The outer layer, called dissolves callose substance and helps in seperation exine is thick, tough, and is composed of of pollen from tetrads. Tapetum secretes Proubisch sporopollenin. Sporopollenin is one of the bodies which get covered with sporopollenin and most resistant organic material known. It can increase the thickness of exine.These are called withstand high temperatures and strong acids ubisch granules. and alkali. No enzyme that degrades sporopollenin is so far is known. Pollen grain exine has prominent Pollen kit is the outermost oily, thick, sticky apertures called germpores where sporopollenin is coating of pollen grains and is mainly composed absent. Pollengrains are well preserved as fossils of lipids and carotenoids, present particularly because of the presence of sporopollenin. The in pollen of entomophilous flowers. exine exhibits a fascinating array of patterns and designs.
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Question Text
Question 1: (a) What remains constant in uniform circular motion?
(b) What changes continuously in uniform circular motion?
Updated OnSep 11, 2022
TopicMotion
SubjectScience
ClassClass 9
Answer TypeText solution:1 Video solution: 1
Upvotes192
Avg. Video Duration15 min