1. Which animal tissue is commonly known as packaging tissue? [1] Ans: Areolar Tissue 2. What do you mean by photoperiod? Name two processes that are dependent on photoperiod.[2] Ans: Photoperiod is related to exposure of plants to the duration of sunlight. Germination, growth and flowering (any two) in case of plants are dependent on Photoperiod. 3. What will happen if: i) the skin epithelium is not stratified. ii) Stratified squamous epithelium lines blood vessels. [2] Ans: i) There will be no protection to the inner layers and wear and tear will be more. ii) The exchange of substances through selectively permeable surface cannot take place. 4. Name the target organ/organ system of AIDS virus. What is the cause of death in case of people suffering from AIDS? [2] Ans: Lymph nodes/Immune System. In absence of a strong Immune system ,minor infections can turn in to serious problems. 5.To increase productivity per unit area ,the farmers grow two differe
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