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ScienceClass 6CBSE

Which one of the following is not associated with reproduction? (a) A new leaf coming out of a tree branch. (b) A dog giving birth to puppy. (c) A seed growing into a plant. Chick hatching from an egg.

: A new leaf coming out of a tree Reproduction is a biological process by which an organism produces young ones of its own kind. A new leaf coming out of a tree branch is vegetative growth in plants; it is not related to reproduction. A dog, a seed and an egg produce puppy, grow into plant and chick respectively are associated with reproduction.

ScienceClass 6CBSE

Choose the set that represents only the biotic components of a habitat. (a) Tiger, Deer, Grass, Soil (b) Rocks, Soil, Plants, Air (c) Sand, Turtle, Crab, Rocks Aquatic plant, Fish, Frog, Insect

Aquatic plant, Fish, Frog, Insect Aquatic plant, fish, frog, insect are biotic components or living components of environment whereas soil, rocks, air and sand are the non-living components or abiotic components.

ScienceClass 6CBSE

Which of the following is an incorrect statement about excretion? (a) Excretion takes place in plants. (b) Excretion takes place both in plants and animals. (c) Excretion is the process of getting rid of excess water only. Secretion is one method of excretion.

(c): Excretion is the process of getting rid of excess water only. Excretion is the elimination of waste products which include water, carbon dioxide and nitrogenous compounds in the form of urine, sweat and exhaled air.

ScienceClass 6CBSE

Which of the following is correct for respiration in plants? (a) Respiration takes place only during day time. (b) Respiration takes place only during night. (c) Respiration takes place both during day and night. Respiration takes place only when plants are not making food.

Solution: (c): Respiration takes place both during day and night. The process in which organic substances are broken down to simpler products with the release of energy is termed as respiration. It takes place both during day and night.

ScienceClass 6CBSE

Which of the following is not an example of response to stimulus? (a) Watering in mouth when we see delicious food items. (b) Closing of leaves of Mimosa plant when touched. (c) Shutting our eyes when an object is suddenly thrown in our direction. A chick hatching out of an egg.

Solution: (d) A chick hatching out of an egg.

ScienceClass 6CBSE

Earthworms breathe through their (a) skin (b) gills (c) lungs stomata

Solution: : skin Breathing occurs in earthworms through moist body surface. Earthworms lack specialized breathing organs. Gills are generally present in aquatic animals for respiration (e.g. fish). Lungs are present in land animals (e.g. mammals) for respiration. Exchange of gases in plants takes place through stomata.

ScienceClass 6CBSE

Which of the following are characteristics of living beings? (i) Respiration (ii) Reproduction (iii) Adaptation (iv) Excretion Choose the correct answer from the options below. (a) (i), (ii) and (iv) only (b) (i) and (ii) only (c) (ii) and (iv) only (i), (ii), (iii) and (iv)

Solution: (d): (i), (ii), (iii) and (iv) Respiration, reproduction, adaptation, excretion are all characteristics of living beings which is necessary for all living organisms.

ScienceClass 6CBSE

Boojho comes across an animal having a stream-lined and slippery body. What is the habitat of the animal? (a) Water (b) Desert (c) Grassland (d) Mountain

: Water Water animals have streamlined body shape which reduces resistance while swimming in water and slippery body helps easily flow in the water which prevents damaging of body.

ScienceClass 6CBSE

Following are some features of plants. (i) They lose a lot of water through transpiration. (ii) Their leaves are always broad and flat. (iii) They lose very little water through transpiration. (iv) Their roots grow very deep into the soil. Which of the combination of above features are typical of desert plants? (a) (i) and (ii) (b) (ii) and (iv) (c) (ii) and (iii) (iii) and (iv)

Solution: (d): (iii) and (iv) Leaves of the desert plants are very small or reduced to spines to reduce water loss through transpiration and roots of these plants grow deep into soil for absorbing water. Hence, desert plants are adapted to live in hot and dry conditions of desert.

ScienceClass 6CBSE

Which of the following cannot be called a habitat? (a) A desert with camels (b) A pond with fishes (c) A jungle with wild animals Cultivated land with grazing cattle

(d): Cultivated land with grazing cattle Habitat is the natural environment where an organism lives. Habitat provides an organism everything it needs to survive i.e., food, shelter and proper climatic conditions. Cultivated land is not the actual place where grazing cattle live.

ScienceClass 6CBSE

1. Identify the wrong statements and correct them. (a) Anther is a part of the pistil. (b) The visible parts of a bud are the petals. (c) Lateral roots are present in a tap root. Leaves perform the function of transpiration only.

Solution: The statement is wrong – Anther is a part of the The statement is wrong – The visible parts of a bud are the The statement is The statement is wrong – Leaves perform various functions other than transpiration, such as gaseous exchange through tiny pores called stomata, photosynthesis etc.

ScienceClass 6CBSE

1. Fill in the blanks with the terms that are listed below. Anther, male, ovary, ovule, petals, pistil, stamen, filament. Sepals, (a) , stamens and (b) are the parts of a flower. Stamen is made up of (c) and (d) and it represents the (e) part of the flower. The female part of the flower is called the (f) . The basal, swollen part of the pistil is called the (g) which contains the (h) .

Solution: petals pistil anther filament male pistil ovary ovules

ScienceClass 6CBSE

1. Can the stem of a plant be compared with a street with two-way traffic? Give reason.

Yes, the stem of a plant can be compared with a street with two-way traffic. It is because in stem, water and mineral move in upward direction and food moves in downward direction. The stem transports water and minerals from the root to leaves and other parts of the plant (upward). The food prepared by the leaves travels through the stem to different parts of plant and roots (downward).

ScienceClass 6CBSE

1. Will a leaf taken from a potted plant kept in a dark room for a few days turn blue black when tested for starch? Give reasons for your answer.

No, it will not turn blue black because all the starch present in the leaf would have been used up by the plant. And due to the non-availability of sunlight no starch would be synthesized in the leaves.

ScienceClass 6CBSE

1. 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. 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.

To remove the green colour of the leaf, firstly the leaf has to be boiled in water next it has to be boiled in alcohol so that chlorophyll comes out. Boojho missed the step of not boiling the leaf in the alcohol which removes the chlorophyll and therefore, he did not get the expected result (i.e. change in colour of the leaf).

ScienceClass 6CBSE

1. Match the parts of plant given in column I with their function in column II. Column I Column II (a) Flower (i) Excretion (b) Leaf (ii) Photosynthesis (c) Stem (iii) Reproduction (d) Root (iv) Bears branches (v) Anchorage

Solution: Column I Column II (a) Flower (iii) Reproduction (b) Leaf (ii) Photosynthesis (c) Stem (iv) Bears branches (d) Root (v) Anchorage

ScienceClass 6CBSE

1. 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.

I am an ‘Herb’. Herbs are the small plants with green and tender I am ‘Root’. Root comes out first from the seed when it is soaked in Another function of root is to absorb water and mineral from the soil.

ScienceClass 6CBSE

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 .

sepals ovary, ovules filament, anther

ScienceClass 6CBSE

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 Ovary, style and stamen

Solution: (b): Stigma, style and ovary The female reproductive part of a flower is the Carpel (pistil). It consists of stigma, style and ovary. Sepals and petals are accessory parts. Stamens are male reproductive parts of a flower.

ScienceClass 6CBSE

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) (i) and (iv)

b): (i) and (iii) Leaves carry out photosynthesis. For photosynthesis to happen, Sunlight, carbon dioxide, chlorophyll and water are necessary. Oxygen is released during photosynthesis. Carbohydrates (glucose) are made during photosynthesis.

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