Question 1

If a heterozygous tall plant (Tt) is crossed with a homozygous short plant (tt), what percentage of the offspring will be tall?

Accepted Answer

In a testcross (Tt × tt), the offspring genotypes are Tt (tall) and tt (short) in a 1:1 ratio, giving 50% tall offspring.

Question 2

What percentage of energy is transferred from one trophic level to the next in an ecosystem?

Accepted Answer

The 10% law states that only approximately 10% of energy is transferred from one trophic level to the next, with the rest lost as heat.

Question 3

Which of the following is an example of asexual reproduction in plants?

Accepted Answer

Asexual reproduction in plants occurs through vegetative propagation methods such as runners, tubers, and fragmentation without involving gametes or fertilization.

Question 4

Which of the following best describes a recessive trait?

Accepted Answer

A recessive trait is expressed only when an organism is homozygous for the recessive allele (aa), as the recessive allele is masked by the dominant allele in heterozygous conditions.

Question 5

Which of the following is an example of a biotic component in an ecosystem?

Accepted Answer

Biotic components are all living organisms in an ecosystem, including plants, animals, and microorganisms.

Question 6

In a food chain, which organism is typically at the top as the tertiary consumer?

Accepted Answer

A tertiary consumer is a carnivore that feeds on secondary consumers, occupying the top trophic level in the food chain.

Question 7

Which of the following is a characteristic of sexual reproduction?

Accepted Answer

Sexual reproduction requires two parents (male and female gametes) and produces genetically diverse offspring due to the combination of different genetic material.

Question 8

The process by which the male gamete (sperm) fuses with the female gamete (ovum) is called:

Accepted Answer

Fertilization is the fusion of sperm and ovum that results in the formation of a zygote, which is the first step in sexual reproduction.

Question 9

In human females, the matured ovum is released from the ovary during a process called:

Accepted Answer

Ovulation is the release of a mature ovum from the ovary, which typically occurs once every 28 days in the human menstrual cycle.

Question 10

In a cross between a homozygous dominant (AA) and a homozygous recessive (aa) organism, what will be the genotype of all F1 offspring?

Accepted Answer

In a monohybrid cross between homozygous dominant (AA) and homozygous recessive (aa), all F1 offspring receive one dominant and one recessive allele, resulting in Aa genotype.

Question 11

Which organelle is responsible for synthesizing proteins in a cell?

Accepted Answer

Ribosomes are the cellular structures that translate messenger RNA into proteins through the process of translation.

Question 12

What is the term used for different forms of a gene at the same locus on a chromosome?

Accepted Answer

Alleles are alternative forms of a gene that occupy the same position (locus) on homologous chromosomes and code for different versions of the same trait.

Question 13

What is the main function of mitochondria in a cell?

Accepted Answer

Mitochondria are known as the powerhouse of the cell because they produce ATP through cellular respiration, providing energy for cell functions.

Question 14

Which of the following is the basic unit of life?

Accepted Answer

The cell is the smallest structural and functional unit of all living organisms, making it the basic unit of life.

Question 15

What is the primary function of the cell membrane?

Accepted Answer

The cell membrane acts as a selectively permeable barrier that controls which substances enter and exit the cell while providing protection to the cell contents.

Question 16

Which of the following organs is responsible for pumping oxygenated blood to all parts of the body?

Accepted Answer

The heart is the central organ of the circulatory system that pumps oxygenated blood received from the lungs to the entire body.

Question 17

How many chambers does a human heart have?

Accepted Answer

The human heart has 4 chambers: two atria (upper) and two ventricles (lower), which work together to pump blood efficiently.

Question 18

Which part of the nervous system controls involuntary actions such as heartbeat and digestion?

Accepted Answer

The autonomic nervous system controls involuntary body functions like heartbeat, breathing, and digestion without conscious effort.

Question 19

Which gland in the human body secretes insulin to regulate blood glucose levels?

Accepted Answer

The pancreas is an endocrine gland that secretes insulin, a hormone essential for regulating and lowering blood glucose levels.

Question 20

Which of the following best describes the role of decomposers in an ecosystem?

Accepted Answer

Decomposers like bacteria and fungi break down dead organisms and organic waste, recycling nutrients back into the ecosystem.

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