Question
Explain the difference between self-pollination and cross - pollination.
✓
Answer
| Self-pollination | Cross-pollination |
| It involves the transfer of pollen from the stamen to the pistil of the same flower. | It involves the transfer of pollen from the stamen of one flower to the pistil of another flower of the same plant or that of a different plant of the same kind. |
| It occurs only in bisexual flowers. | It occurs in both unisexual and bisexual flowers. |
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Read the passage and answer the questions :
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→Rashmika noticed that the shadows of trees on her way to school were long in the morning and much shorter in the afternoon. She began to wonder why the size of the shadows changed throughout the day.
Q.1. What causes the length of a shadow to change during the day?
(a) The shape of the object
(b) The movement of the Earth around the Sun
(c) The change in the Sun's position in the sky due to Earth's rotation
(d) The distance between the Earth and the Sun
Q.2. When would Rashmika observe the shortest shadow of a tree?
(a) Early morning$\quad$(b) Late evening
(c) Noon$\quad$$\quad$(d) Midnight
Q.3. Which direction does a shadow point at noon in India?
(a) East$\quad$$\quad$(b) West
(c) South$\quad$$\quad$(d) North
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A student is conducting an experiment to observe the reaction of magnesium ribbon when it is burned in air. The student first cleans a small piece of magnesium ribbon using sandpaper and then ignites it using a flame. The ribbon burns with a dazzling white flame, and a white powdery substance is formed after the reaction. The student records these observations and continues to investigate the nature of the product formed by adding a small amount of water to the white powder.
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(b) Magnesium oxide
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(b) The product will turn red litmus paper blue
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