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1.	Which growth hormone is used to enhance dairy productivity ?
Answer» Recombinant boving growth hormone (rBGH) or recombinant bovine somatotropin (rBST) refers to bovine growth hormone, is used in dairy industry to enhance productivity.

2.	Give the floral adaptations for anemophily.
Answer» (i) Floral adaptations for anemophily : 1. Anemophilous flowers are small, inconspicuous without bright colours, nectar and fragrance. 2. Petals are green or highly reduced. 3. When flowers are unisexual, the male flowers are more numerous than female and are situated at a higher level. 4. Stamens are with long filaments, versatile and exposed anthers. 5. Pollen grains are produced in extremely large numbers to compensate their wastage. There are small, smooth walled, pale yellow in colour and light weighted. 6. Long style bears large feathery or hairy stigma to trap pollen grains. E.g. Grasses, Maize, Jowar, Sugarcane, etc.

3.	Name of two classes to which Archaeopteryx acts as connecting link.
Answer» Archaeopteryx is the connecting link between birds and reptiles and thus shares characters of both the classes i.e., birds and reptiles.

4.	Describe five types of leucocytesm,with the help of diagrames,Add a note on their functions.
Answer» Leucocytes or white blood corpuscles (WBCs) ( leukos-white kytos-cell ) 1. Leucocytes are colourless,nucleated,amoeboid and phagocytic cells. Due to their amoebid movement they can squeeze out of blood capillaries.This is called diapedesis 3. The size is about 8 to 15 ` mu m` There are about 5000 to 9000 WBCs per cubic mm of blood, This is called total WBC count. 5.The average life span is about 3 to 4 days Leucocytes are of two types-granulocytes and agranulocytes Granulocytes show granular cytoplasm and lobed nucles, They are of three types : neutrophills eosinophis and basophills Neutrophills : 1. The cytoplasmic granules are stainned with neutral dyes 2.The nucleus is three to five lobed hence are called polymorphonuclear leucocytes or poly-morphs 3. They constitute microorganisms Eodinophills (Acidophills ): 1.They show the cytoplasmic granules which are stained with acidic dyes such as eosin 2.The nucleus is bilobed They constitute about 3% (1-6% range )of called WBCs 4. Incrase in number of eosinophills is called eosinophilla Function: 1. Their number increases during allergic conditions 2.They show anti-histamine property 3. They are non-phagocytic Bosophills 1. They have the cytoplasmic granules that are stained with basic dyes such as methylene blues 3. The nucleus is twisted 3. They constitute about 0.5%of total WBCs Function 1. they relase haparin (anticoagulant ) and histamine (involved in inflammatory and allergic reaction ) 2. They are non phagocytic Agranulocytes show absence of granules in the cytopasm and nucleus is not lobed, They are of two types-Iymphocytes and monocytes Lymphocytes: 1. They show large round nucleus 2. They constitute about 25-33% of total WBCs 3.They are two types-T and B-Lymmphocytes Function 1. They are the largest of all WBCs and show large kidney-shaped nucleus. 2. They constitute about 3-9% of total WBCs 3 . They are also called scavengers Function : They are phagocytic in function At the site of infection, monocytes anlarge and differentiate into macrophages which engulf micro orfanisms and remove cell debris.Hence they are also called scavengers.

5.	A person suffering from diabetes insipidus shows ………………………A. hyperglycemiaB. hypoglycemiaC. polyuriaD. hypertension
Answer» Correct Answer - C

6.	What is emasculation?
Answer» Emasculation : If a selected plant which has to be used as a female parent, bears bisexual flowers, anthers from its young flower buds are removed. This step is called emasculation. It is not repuired when selected plant to be used as a female parent, bears unisexual flowers.

7.	What is VAM ?
Answer» VAM means Vesicular Arbuscular Mycorrhizae. Mycorrhiza is a fungus. It forms symbiotic association with the roots of higher plants. It grows in between and within the cortical cells of roots. Fungal hyphae penetrate the cells and form vesicles or finely branched arbuscles. Hence they are called versicular Arbuscular Mycorrhizae or VAM. The plants with VAM grow luxuriantly in less irrigated lands.

8.	What is the role of decomposers in the ecosystem?
Answer» In any ecosystem the producers, consumers and decomposers play important roles. For stability of an ecosystem as the production of organic matter is important, its consumption and finally decomposition is also equally important for recycling of the nutrients. The decomposers are mostly bacteria, actinomycetes and fungi. They decompose the dead organic matter into simpler compounds and make it available in the environment for organisms.