This type of reproduction produces variety in species.Sexual reproduction
Asexual reproduction
Mitosis
Cloning

Answer:

C.differences in food preferences between two populations of birds.

Explanation:

Reproductive isolation is a type of isolating mechanism which may further lead to speciation.

In this type of isolating mechanisms, the two types of organisms are isolated as they are unable to either mate or even if they mate, they fail to produce a viable progeny.

Reproductive isolation can occur due to :

1. Different mating strategies, time or place.

2. Inability to fertilize.

3.Production of a sterile or viable progeny.

Therefore, from the given option differences in food preferences is not a type of reproductive isolation as it does not follow any of the three listed mechanisms.

Final answer:

Reproductive isolation includes mechanisms that prevent different species from producing viable offspring. These can include behavioral, temporal, or biological factors. Differences in food preferences do not contribute to reproductive isolation.

Explanation:

In the context of evolution, reproductive isolation is a set of mechanisms, behaviours and physiological processes that prevent members of two different species that cross or mate from producing viable, fertile offspring. Examples include differences in behaviours like courtship songs, differences in breeding season timing, or incompatibility of gametes (like sperm and eggs) of two species.

Therefore, the choice C - differences in food preferences between two populations of birds is NOT an example of reproductive isolation. It's a ecological difference, not a barrier to mating or producing viable offspring.

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Correct answer: A). The enzyme influences the speed of change from substrate to product

The enzymes are the biological catalyst that speed up the rate of chemical reactions by decreasing the activation energy of the reaction pathway.

They increase the speed of change of substrate to the product and it remains unchanged in the reaction. Hence, it can be used again and again.

Enzymes are highly specific in nature, only a specific substrate binds to the enzyme's active site. Hence, a particular enzyme is required to catalyze a reaction.

The statement "The enzyme influences the speed of change from substrate to product" is correct. Option 1 is correct.

Enzymes are biological catalysts that speed up chemical reactions by lowering the activationenergy required for the reaction to occur. Enzymes do not undergo any permanent changes during the reaction and are not consumed in the process.

Enzymes are proteins that play a crucial role in biological reactions by facilitating the conversion of substrates into products. Substrates are the specific molecules that bind to the active site of an enzyme, forming an enzyme-substrate complex. The active site is a region on the enzyme's surface that has a complementary shape to the substrate.

When the substrate binds to the enzyme's active site, it undergoes a temporary change in shape, known as the induced fit model. This induced fit brings the reactive groups of the substrate close together, making it easier for the chemicalreaction to occur. As a result, the activation energy required for the reaction to proceed is significantly reduced.

The enzyme does not alter the nature of the reaction or the final products. Instead, it provides an environment where the reaction can occur more rapidly and efficiently. Once the reaction is complete, the enzyme releases the products, and it can then bind to new substrate molecules to catalyze additional reactions.

Enzymes are highly specific, meaning that each enzyme catalyzes a particular reaction with specific substrates. This specificity ensures that only the appropriate substrates bind to the enzyme, preventing unwanted side reactions in the cell.

In summary, enzymes and substrates are related through the process of enzyme-substrate interactions, where enzymes accelerate the conversion of substrates into products by lowering the activation energy required for the reaction. This crucial role of enzymes in biological processes makes them vital for maintaining the proper functioning of living organisms.

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Answer:

The correct answer is: Mucus membrane.

Explanation:

• The lining of the epithelial tissue forming the mucus membrane contains some specialised cells which are called the Goblet cells.
• These cells secrete a slippery substance called the Mucus.
• The Mucus is a dense, aqueous and slippery substance that is composed of anti-microbial enzymes like lysosyme, immunoglobulins (antibodies) and glycoproteins like mucins.
• The mucus secreting cells line the internal tracts of the body that come into contact with outside environment, like the respiratory tract, alimentary canal, urino-genital tract.
• If any microbial pathogen gain access into any of these tracts the lysosyme in the mucus causes the microbial cells to undergo lysis, hence killed.
• The immunoglobulins, on recognising a pathogen, activate the immune cells of the body to fight against the intruding pathogen.

Answer: C. magma

Explanation: This molten rock is called magma. Molten rock that reaches Earth's surface is called lava. An igneous rock is classified on the basis of its mineral composition and the size of its mineral crystals. A rock formed from magma can have the same composition as a rock formed from lava.