Biology — Part 2 MCQs with Explanations

Wilting is a condition when the amount of water lost from the plant during transpiration is greater the amount of water absorbed from the soil. It is the loss of rigidity of non-woody parts of the plants. This occurs when the turgor pressure in non-lignified plant cells falls towards zero, as a result of diminished water in the cells.

Monotremes are different from other mammals because they lay eggs and have no teats. Monotremes are different from other mammals because they lay eggs and have no teats. The milk is provided for their young by being secreted by many pores on the female's belly.

Here Homologous Means having the same relation or relative position or structure. Here snakes poison is in glands and here salivary glands are in Vertebrates

Radical vascular bundles are those in which xylem and phloem occur on the different radii.

Phototropism is one of the many plant tropisms or movements which respond to external stimuli. Growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism (skototropism).

Plant have cellulose while animals lack it.

Osmosis is defined as the flow of solvent molecules from a region of their higher concentration to a region of their lower concentration across a semipermeable membrane. Osmosis does not explains movement of solute particles or solution.

Photosynthesis is a process which is reductive, endergonic and anabolic.

Gregor Mendal performed his classical experiment on pea.

A common cause of hyperpigmentation is an excess production of melanin. Melanin is a pigment that gives skin its color. It's produced by skin cells called melanocytes.

Together with adrenaline, norepinephrine increases heart rate and blood pumping from the heart. It also increases blood pressure and helps break down fat and increase blood sugar levels to provide more energy to the body.

Night blindness is caused by lack of vitamin A.

In dicot root, well developed pith is absent. In monocot root, well developed pith is present.

Radioactivity is a phenomenon of the spontaneous emission of protons, electrons and gamma rays.

Organic Substances which, in very small amounts, control growth and development called hormones.

Our major foods, fibres, spices, fruits and beverage crops are flowering plants.

Flowering plants show the movement due to light.

A capsid is the protein shell of a virus, enclosing its genetic material. The proteins making up the capsid are called capsid proteins or viral coat proteins (VCP).

Radish is a modified root.

Most common disease of poultry in India is ranikhet.

Among these Connective Tissue are most abundant in our body. Connective tissue is found in between other tissues everywhere in the body, including the nervous system.

Mumps is a contagious disease that is caused by a virus. It typically starts with a few days of fever, headache, muscle aches, tiredness, and loss of appetite. Then most people will have swelling of their salivary glands.

Rain water helps to increase the calcium contents to some extent.

Number of chromosomes in down's syndrome is 47.

Plants are killed in winter by frost as there is desiccation and mechanical damage to the tissues. Desiccation is the state of extreme dryness, or the process of extreme drying.

Haploids are more suitable for mutation studies than the diploids.

Pulses are a great source of protein. They can be particularly important for people who do not get protein by eating meat, fish or dairy products. Pulses include beans, lentils and peas.

Oxygen in our blood is transported by a protein named Haemoglobin.

Nymph is the name of young one of cockroach.

The most likely reason for the doctor's statement is that the person is infected by a virus.

Plants that grow under average temperature and moisture are called mesophytes.

Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of enzymes.

A mutation is a change in a DNA sequence. Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals called mutagens, or infection by viruses.

Anemophily is the process when pollen is transported by air currents from one individual plant to another. About 12% of the world's flowering plants are wind-pollinated, including grasses and cereal crops, many trees, and the infamous allergenic ragweeds.

Pollen grains in plants are produced in flower.

Nitrogen is not fixed in ecosystems by denitrification.

Ptyalin is produced by the salivary glands, whereas pancreatic amylase is secreted by the pancreas into the small intestine.

Vibrio cholerae (also Kommabacillus) is a gram negative comma-shaped bacterium with a polar flagellum that causes cholera in humans

Animal, Micro organism and Plants are biotic components of the environment while soil along with other landforms are non-biotic components of the environment.

A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain.