In pea plants, purple flowers (PP) are dominant over white (pp). Crossing PP × pp gives F₁ as Pp, all showing purple flowers. F₁ self-crossed (Pp × Pp) produces F₂ in 3:1 ratio: 3 purple, 1 white. F₁ visible characters: All purple ...
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(i) Alveoli are tiny air sacs in lungs where exchange of gases occurs. Oxygen diffuses into blood, and carbon dioxide diffuses out.(ii) Stomata are small pores on leaves that allow exchange of gases and water vapour. CBSE Sample Paper Class ...
Plants excrete wastes in several ways. Excess water is lost through transpiration. Oxygen from photosynthesis diffuses out through stomata. Some wastes like gums, resins, and latex are stored in old xylem or special cells. Leaves and bark shedding also remove ...
The correct answer is [C] A is true but R is false.The maximum concentration of chemicals and pesticides occurs at the highest trophic level, not the first. These chemicals are non-biodegradable, so they accumulate through the food chain, causing ...
The correct answer is [A] Both A and R are true, and R is the correct explanation of A.The father contributes either an X or Y chromosome. If the child inherits X from father, it becomes XX (girl), and ...