Biology

1.Ordinary table salt is sodium chloride. What is baking soda?

1. Potassium chloride
2. Potassium carbonate
3. Potassium hydroxide
4. Sodium bicarbonate

Answer:Option 1

Explanation:

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2.Ozone hole refers to

1. hole in ozone layer
2. decrease in the ozone layer in troposphere
3. decrease in thickness of ozone layer in stratosphere
4. increase in the thickness of ozone layer in troposphere

Answer:Option 1

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3.Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to

1. angiosperms
2. gymnosperms
3. monocotyledons
4. dicotyledons

Answer:Option 1

Explanation:

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4.Plants receive their nutrients mainly from

1. chlorophyll
2. atmosphere
3. light
4. soil

Answer:Option 1

Explanation:

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5.Movement of cell against concentration gradient is called

1. osmosis
2. active transport
3. diffusion
4. passive transport

Answer:Option 1

Explanation:

Solution:

Active transport, this is the only transport method that can move species against their concentration gradient (from low to high concentration). Facilitated diffusion only moves species down their concentration gradient from high to low concentration.

6.Photosynthesis generally takes place in which parts of the plant?

1. Leaf and other chloroplast bearing parts
2. steam and leaf
3. Roots and chloroplast bearing parts
4. Bark and leaf

Answer:Option 1

Explanation:

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7.Most fish do not sink in water because of the presence of

swim bladder
air bladder
air sacs
air in spongy bones

1. I and II are correct
2. II and III are correct
3. III and IV are correct
4. I, II, III and IV are correct

Answer:Option 1

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8.Plants absorb dissolved nitrates from soil and convert them into

1. free nitrogen
2. urea
3. ammonia
4. proteins

Answer:Option 1

Explanation:

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9.Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with

1. all gymnosperms, except conifers
2. only angiosperms
3. only conifers
4. angiosperms and all gymnosperms except conifers

Answer:Option 1

Explanation:

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10.One of the following is not a function of bones.

1. Place for muscle attachment
2. Protection of vital organs
3. Secretion of hormones for calcium regulation in blood and bones
4. Production of blood corpuscles

Answer:Option 1

Explanation:

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