Biology Concepts and Articles
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CHARACTERISTICS OF WOOD Wood is a I–41 fibrous tissue found in many plants. It has been used for centuries ice noth fuel and as a construction material. It is composed of 2 natural composite of cellulose fibers (which are strong in tensio .) embedded
SUBJECTIVE QUESTIONS IN BIRDS Why are birds called as “glorified reptiles”? Or Discuss phylogenetic relationships of birds. Discuss evolution of flight. What is the evolutionary significance of Archaeopteryx? Write note on diversity of modern birds. What is the significance of feathers in the birds?
Appendix Apiaceae (Umbelliferae) Carrot Family Diagnostic characters Habits: Annual or perennial herbs rarely shrubs. Roots: Tap root, branched, sometimes, tuberous due to presence of stored food. Stem: Herbaceous stem, erect or prostate with swollen nodes. Leaves: Petiolate, Alternate, simple, exstipulate, reticulate venation. Usually sheathing
MULTIPLE CHOICE QUESTIONS OF GYMNOSPERMS 1. Which of the followings is correct for vascular bundle of gymnosperms? (a) Stele (b) Exarch (c) Collateral (d) Conjoint 2. Secondary growth occurs by the activity of: (a) Phloem (c) Xylem (c) Cambium (d) Bark 3. Which of
DEVELOPMENT OF EMBRYO SAC OR FEMALE GAMETOPHYTE Types of embryo Sac Development There we types of embryo sac development. The classification is based on: The number of 9 ses or spore nuclei entering into the formation of embryo sac Thus embryo sac may be
SHORT QUESTIONS OF GYMNOSPERMS 1. Give occurrence of Gymnosperms. Ans: Gymnosperms are naked seeded plants. Gymnosperms are a group of ancient plants. They become dominant in the Jurassic period. Most of the gymnosperms are evergreen trees. Some shrubby plants are also found in this
MODEL SUBJECTIVE QUESTIONS OF GYMNOSPERMS 1. Describe life cycle of Gymnosperms. 2. Describe kingdoms of life. 3. Give affinities of gymnosperms. 4. Discuss structures of root, stem and leaves of Cycas with labelled diagrams. 5. Describe structures and development of ma!, and female cones
EMBRYOLOG Early development of Capsella bursa–pastoris Following developmental changes take place in the embryo CopseIla bursa pastoris: I. First division of Oospore: Its oospore increases in size. It divides transversely in two cells. The cell toward the microphyll end is called suspensor cell. The
DEFINITIONS AND KEY POINTS FOR OBJECTIVES OF GYMNOSPERMS
DEFINITIONS AND KEY POINTS FOR OBJECTIVES IN BIRDS TERMS DEFINITIONS Plumage The covering of leathers on a bird is called the plumage. Preening Preening keeps the feathers smooth, clean and in place. Preening is done by rubbing the bill over the leathers. Anting In