161. Blood is-

1. Connective tissue
2. Epithelial tissue
3. Both of the above
4. None of the above

Option “1” is correct.
Blood is a liquid connecting tissue. It flows inside the blood vessels and is viscous thick fluid.
162. Which of the following types of light are strongly absorbed by plants?

1. Violet and orange
2. Blue and red
3. Indigo and yellow
4. Yellow and violet

Option “2” is correct.
Plants use only certain colours from light for the process of photosynthesis. The chlorophyll absorbs blue, red and violet light rays. Photosynthesis occurs more in blue and red light rays and less or not all in green light rays.
163. In which category of food is the most amount of calories per unit:-

1. Vitamins
2. Fats
3. Carbohydrates
4. Proteins

Option “2” is correct.
Fats have highest calorie value per unit because of its higher rate of oxidation due to less oxygen.
164. Clove is a-

1. Buds of stem
2. Bales of root
3. Closed buds
4. Seed

Option “3” is correct.
Cloves are the aromatic closed, dried floral bud, which is used in Ayurvedic medicine, making food and as an anodyne for dental emergences.
165. A hydrophyte is:

1. A marine animal
2. An aquatic plant
3. A plant disease
4. A rootless plant

Option “2” is correct.
Hydrophytes or an aquatic plants are plants, that have adapted to live in an aquatic environment (salt water of fresh water).
166. Mendel’s principle of inheritance is based on-

1. Vegetative reproduction
2. Asexual reproduction
3. Sexual reproduction
4. All of the above

Option “3” is correct.
Mendel’s principle of inheritance is based on sexual reproduction.
167. Leprosy is caused by-

1. Bacteria
2. Virus
3. Fungus
4. Protozoa

Option “1” is correct.
Leprosy is caused by a slow-growing type of bacteria called Mycobacterium leprae (M. leprae).
168. The age of the tree, in years can be ascertained by:

1. Its weight
2. its height
3. The number of its annular rings
4. Length of its root

Option “3” is correct.
The number of rings indicates the number of years the tree lived.
169. Who discovered bacteria?

1. Fleming
2. Lamble
3. Temin
4. Leeuwenhoek

Option “4” is correct.
Antony Van leeuwenhoek is regarded as the father of microbiology. He is known for the discovery of bacteria.
170. Desert plants have longer root system because:

1. High temperature of the soil stimulates the growth of roots
2. Roots grow in search of water
3. Soil does not contain water, hence becomes compact and presses the roots to grow longer
4. Roots moves opposite to the solar heat

Option “2” is correct.
Cactus, calotropis, aloe, etc. are desert plants which have the capability to complete their life-cycle even in a dry atmosphere. The root system of these plants become taller in search of water from the soil and their stems are small, adapted and underground sometimes.
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48 thoughts on “Biology”

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