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Boojho wanted to test the presence of starch in leaves. He performed the following steps. (1) He took a leaf and boiled it in water. (2) He placed the leaf in a petri dish and poured some iodine over it. He did not get the expected result. Which step did he miss? Explain.

Boojho didn’t get the result as he boiled the leaf in water instead of alcohol. Alcohol removes green colour (chlorophyll) from the leaf.... View Article

Solve the riddles given below. (a) “I have a green tender stem and I am much shorter than you. Who am I?” (b) I come out first from the seed when it is soaked in water. I provide anchorage to plants. Who am I? Write another function that I perform.

(a) Herb or name of any small plant. (b) Root; absorption of water and minerals. The herb is a short-sized plant with soft, green, delicate... View Article

Fill in the blanks. (a) The small green leaves at the base of flowers are known as ___. (b) The swollen basal part of the pistil is the which bears the . (c) Stamen has two parts called_ and . (d) The young unopened flower is termed as____.

(a) The small green leaves at the base of the flower are known as sepals. The sepals protect the flower when it is in the form of a bud in the... View Article

Which of the following terms constitute the female part of the flower? (a) Sepals, petal and stamen (b) Stigma, style and ovary (c) Ovary, stamen and stigma (d) Ovary, style and stamen

b) Stigma, style and ovary The stigma receives the pollen grain, the pollen tube passes through the style and the ovary is where seeds are... View Article

Read the following sentences about photosynthesis. (i) Sunlight, carbon dioxide, chlorophyll and water are necessary. (ii) Oxygen is absorbed. (iii) Leaves carry out photosynthesis. (iv) Proteins are made during photosynthesis. Choose the correct pair of sentences that are true to photosynthesis. (a) (iii) and (iv) (b) (i) and (iii) (c) (ii) and (iv) (d) (i) and (iv)

Statement (i) and (iii) are correct. The leaves make food for the plant by the process of photosynthesis. In photosynthesis, the green leaves... View Article

Which of the following is not a correct match? (a) Petiole: attaches the leaf to stem (b) Lamina: green flat part of the leaf (c) Margin: gives shape to the leaf (d) Veins: transpiration

d) Veins: transpiration In transpiration the evaporation of water takes place, the process is done by stomata of the leaves. The veins are like... View Article

Which of the following is not the primary function of the stem? (a) Conduction of water (b) Photosynthesis (c) Formation of branches (d) Bears flowers and fruits

b) Photosynthesis. Photosynthesis is the primary function of leaves. The important functions of a stem include: A stem carries out a number... View Article

Which of the following is the correct match between the characteristics of the stem and the category of a plant? (a) The weak stem which cannot stand upright: Creeper (b) Green tender stem: Shrub (c) Thick, hard stem with branching near the base: Tree (d) Thick, hard stem with branches high on the plant: Herb

a) Weak stem which cannot stand upright: Creeper A plant that has thin, long and weak stem is called creeper. It cannot stand upright and... View Article

Which of the following combination of features would you observe in the grass? (a) Parallel venation and fibrous root (b) Parallel venation and taproot (c) Reticulate venation and fibrous root (d) Reticulate venation and taproot

a) Parallel venation and fibrous root Parallel venation and fibrous roots are usually found in grass, maize, wheat etc. In parallel venation,... View Article

Explain the process of rooftop rainwater harvesting with the help of a suitable diagram.

Rooftop rain water harvesting is a method where ran water that falls on the rooftop of a building or house, is collected into storage tanks... View Article

Dissolve two spoons of common salt in half a cup of water. Now if you want to get the salt back, what will you do?

To get salt back from a half cup of water with two spoons of common salt already dissolved in it, we can either heat the water in a pan on a... View Article

Draw a diagram to show how sea water reaches a lake or pond.

The sun is the ultimate source of energy, and it powers most of the evaporation that occurs on earth. Evaporation generally happens when water... View Article

Most of the water that falls on the land as rain and snow, sooner or later goes back to a sea or an ocean. Explain how it happens?

Most of the water that falls on the land as rain and snow, sooner or later goes back to a sea or an ocean. This happens in the following manner-... View Article

Fill in the blanks selecting words from, the following list. Snow, rain, clouds, vapour, evaporation, transpiration. Water, as ____ goes into atmosphere by the processes of _ and _ and forms , which on condensation fall in the form of and ___.

(i) vapour. (ii) evaporation. (iii) transpiration. (iv) clouds. (v) snow. (vi) rain. The water cycle has a tremendous impact on the... View Article

Why is there a need for conserving water? Give two reasons.

Conservation of water mainly refers to protect, preserve, and control the usage of water and its resources. It is the system introduced to manage... View Article

How do the areas covered with concrete affect the availability of groundwater?

The areas that are covered with concrete lower the availability of ground water because such areas reduce the seepage (entry) of rainwater into... View Article

Water kept in sunlight gets heat from sun and is evaporated. But how does water kept under the shade of a tree also get evaporated? Explain.

Water gets evaporated despite being under the tree during the daytime because the air surrounding the tree also gets heated up from the presence... View Article

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