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In our country, large patches of forests are being cleared for cultivation of crops. The environmental impact of such a practice will lead to (a) soil erosion (b) soil conservation (c) soil pollution (d) soil fertility

a) Soil erosion In this process, the soil particles are loosened or washed away in the valleys, oceans, rivers, streams... View Article

Ozone-layer is getting depleted because of (a) excessive use of automobiles (b) excessive formation of industrial units (c) excessive use of man-made compounds containing both fluorine and chlorine (d) excessive deforestation.

c) excessive use of man-made compounds containing both fluorine and chlorine Explanation Ozone-layer is getting depleted because of excessive use... View Article

Paheli watched her grandmother making mango pickle. After she bottled the pickle, her grandmother poured oil on top of the pickle before closing the lid. Paheli wanted to know why oil was poured? Can you help her understand why?

The oil poured on the pickles forms a layer of protection between air and pickle from the bacteria present in... View Article

Classify the following organisms based on the absence/presence of true coelom (i.e., acoelomate, pseudocoelomate and coelomate) Spongilla, Sea anemone, Planaria, Liver fluke Wuchereria, Ascaris, Nereis, Earthworm, Scorpion, Birds, Fishes, Horse

Spongilla —Acoelomate Sea anemone—Acoelomate Planaria—Acoelomate Liver fluke—Acoelomate Wuchereria—Pseudocoelomate Ascaris—Psudocoelomate Nereis—Coelomate Scorpion—Coelomate Earthworm—Coelomate Birds, Fishes and Horse—Coelomate The coelom is one... View Article

Which of the following statements are true? (i) Sudden action in response to something in the environment is called reflex action (ii) Sensory neurons carry signals from the spinal cord to muscles (iii) Motor neurons carry signals from receptors to the spinal cord (iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called the reflex arc (a) (i) and (ii) (b) (i) and (iii) (c) (i) and (iv) (d) (i) , (ii) and (iii)

(c) (i) and (iv) Explanation Reflex action is a sudden and involuntary response to stimuli. It helps organisms to quickly... View Article

A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. After 3 years the nail will (a) move downwards (b) move upwards (c) remain at the same position (d) move sideways

C) Remain at the same position The plant grows in length by apical meristems. Apical meristem is present on the... View Article

In which of the following groups of organisms, food material is broken down outside the body and absorbed? (a) Mushroom, green plants, Amoeba (b) Yeast, mushroom, bread mould (c) Paramecium, Amoeba, Cuscuta (d) Cuscuta, lice, tapeworm

b) Yeast, Mushroom, Bread mould Explanation Organism like – Mushroom, Yeast, and Bread mould are saprophytic. They break down food... View Article

Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called (a) forest Conservation Day (b) plantation month (c) Van Mahotsav (d) wildlife week

(c) Van Mahotsav Van Mahotsav week is celebrated in the first week of July and plantation drives are carried out... View Article

Find out the false sentences (a) Golgi apparatus is involved with the formation of lysosomes (b) Nucleus, mitochondria and plastid have DNA; hence they are able to make their own structural proteins (c) Mitochondria is said to be the powerhouse of the cell as ATP is generated in them. (d) Cytoplasm is called as protoplasm

d) Cytoplasm is called as protoplasm. It is a false statement. Along with the function of secretion of various enzyme... View Article

Unscramble the underlined words in the following sentences. (a) Reproductive life of a woman lasts from hacreemn to spauoemen. (b) The development of a caterpillar to an adult butterfly is termed as poommertaissh. (c) The overgrowth of sumselc in xalnyr leads to the hoarse voice in adolescent boys. (d) Dannalier helps the body to adjust and fight the stress.

(a) Reproductive life of a woman lasts from menarche to menopause. In males and females, the reproductive stage commences at... View Article

The place meant for the conservation of biodiversity in their natural habitat are (i) Zoological garden (ii) Botanical garden (iii) Wildlife sanctuary (iv) National park (a) i & ii; (b) ii & iii; (c) iii & iv; (d) i & iv

c) ii and iv Wildlife sanctuary, national parks are in situ conservation methods of biodiversity. These places are meant for... View Article

You are provided with three watch glasses containing milk, petrol and mustard oil, respectively. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why?

Petrol will catch fire instantly because it is highly inflammable. Mustard oil and milk has very high ignition temperature. So,... View Article

PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?

Thermoplastic Thermosetting Plastic Thermoplastic can be synthesized by the process called addition polymerization. Thermosetting plastics are synthesized by condensation polymerization.... View Article

Arrange these statements in correct sequence of preparation of green manure. (a) Green plants are decomposed in soil. (b) Green plants are cultivated for preparing manure or crop plant parts are used. (c) Plants are ploughed and mixed into the soil. (d) After decomposition it becomes green manure.

The correct sequence for preparation of green manure is, b) Green plants are cultivated for preparing manure or crop plant... View Article

Which of the following feature is correct for a wildlife sanctuary? (a) It is an artificially created protected area for animals. (b) It is a protected area for threatened and endangered wild animals. (c) It is meant for the conservation of only plant species. (d) Capturing and poaching of animals is strictly prohibited here.

(a) It is an artificially created area for animals protection Explanation A wildlife sanctuary is an area where animal habitats... View Article

Observe the chart and graph given in Fig. carefully and answer the following questions. (a) Which of the line represents the height of boys? (b) Which line represents the height of girls? (c) What is the difference between the pattern of increase in the height of boys and girls? (d) Is this pattern true for each individual?

(a) The red line represents the height of boys. (b) The blue line represents the height of girls. (c) At... View Article

Fill in the blanks (a) Pigeon pea is a good source of . (b) Berseem is an importantcrop. (c) The crops which are grown in rainy season are calledcrops. (d) are rich in vitamins. (e) __ crop grows in winter season.

(a) Protein The pigeon pea plant is extensively cultivated in different parts of India. Pigeon Peas are high in nutritional... View Article

If the tip of sugarcane plant is removed from the field, even then it keeps on growing in length. It is due to the presence of (a) cambium (b) apical meristem (c) lateral meristem (d) intercalary meristem

(d) intercalary meristem Stem located at the base of leaves or nodes and leads to the increase in the length... View Article

Intestine absorbs the digested food materials. What type of epithelial cells are responsible for that? (a) Stratified squamous epithelium (b) Columnar epithelium (c) Spindle fibres (d) Cuboidal epithelium

b) Columnar epithelium Explanation It consists of pillar-like cells with their nuclei towards the base. They form the lining of... View Article

Which of the following is not a criterion for the classification of living organisms? (a) Body design of the organism (b) Ability to produce one’s own food (c) Membrane-bound nucleus and cell organelles (d) Height of the plant

d) Height of the plant Explanation The criteria for classification of organisms are as follows- Nature of cell (prokaryotic or... View Article

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