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Gastric juice contains pepsin, lipase, and rennin. Pepsin is secreted in an inactive form as pepsinogen, which is activated by HCl. Pepsin digests proteins into peptones. Lipase breaks down fats into fatty acids. Rennin is a proteolytic enzyme present in the gastric juice. It helps in the coagulation of milk.
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The coelom is the body cavity lined by the mesoderm.
*Coelom at embryonic stage, divides the mesoderm into two layers.
*Coelom helps in absorption of shocks.
*Coelom also helps the organisms to grow independently away from the body wall.
*Coelom in mammals is divided into peritoneal, pleural and pericardial cavities.
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- Heterospory is the phenomenon in which two different kinds spores are produced. These spores differ in size. The smaller spore is called microspore while the larger spore is called megaspore.
- Microspore gives rise to the male gametophyte while the megaspore gives rise to the female gametophyte.
- It was first evolved in pteridophytes.
- The heterospory is the first step of evolution of seed development in gymnosperms and angiosperms.
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Development of a dicot embryo (i) Embryo formation starts after a certain amount of endosperm is formed. (ii) Zygote divides by mitosis to form a proembryo. (iii) Formation of globular and heart-shaped embryo occurs, which finally becomes horse shoe-shaped forms a mature embryo. (iv) In dicot plants, embryo consists of two cotyledons and an embryonal axis between them.(v) The portion of embryonal axis above the level of attachment of cotyledons is epicotyl and it terminates in the plumule. (vi) The portion of embryonal axis below the level of attachment of cotyledon is the hypocotyl, it becomes radicle (root tip). The embryonic stages during the development of a mature embryo sac are:
(a) Fertilised embryo sac showing zygote and Primary Endosperm Nucleus (PEN).
(b) Stages in embryo development in a dicot
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Algae
- Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic plants.
- They occur in moist stones, soils, and wood or in association with fungi and animals.
Example-1. Lichen is the association of algae with fungi.
- Algae grow on the body of sloth bear.
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- Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic plants.
- They occur in moist stones, soils, and wood or in association with fungi and animals.
Example-1. Lichen is the association of algae with fungi.
- Algae grow on the body of sloth bear.
- Some algae are unicellular, some exist in colonial or filamentous forms, and a few marine plants form massive plant bodies.
- The algae reproduce by vegetative, asexual, and sexual methods.
- Vegetative reproduction is by fragmentation, where each fragment develops into a thallus.
- Asexual reproduction is by the production of flagellated zoospores which on germination give rise to new plants.
- Sexual reproduction takes place through fusion of two gametes, if the gametes with or without flagella are similar in size they are isogamous, if dissimilar in size they are anisogamous , and if female gamete is large, non-motile and male gamete is smaller, motile, the gametes are termed as
- Isogamous gametes with flagella are seen in Chlamydomonas and without flagella are seen in Spirogyra , anisogamous gametes are seen in in some species of Chlamydomonas, and oogamous gametes are seen in Volvox, Fucus.
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