Biology - Set-A Online Practice Exams | 11th Class Exams

Biology - Set-A

Free Mock Test

Questions 24
Maximum mark 24

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Biology is a diverse and fascinating field of study that examines the living organisms and their interactions with the environment. The Biology Set A exam assesses your knowledge of specific topics such as cell structure, cell cycle, tissues, plant physiology, and human physiology. MyTAT provides you with the tools to explore the wonders of biology and prepare for the exam with confidence.

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Biology - Set-A Online Practice Exams FAQs

1. What is the main difference between prokaryotic and eukaryotic cells?

The main difference between prokaryotic and eukaryotic cells is the presence of a nucleus. In prokaryotic cells, such as bacteria, the genetic material is not enclosed within a membrane-bound nucleus and is found in the nucleoid region. Eukaryotic cells, found in plants, animals, and fungi, have a well-defined nucleus that contains the genetic material (DNA) enclosed within a nuclear membrane. Additionally, eukaryotic cells have various membrane-bound organelles, while prokaryotic cells lack such organelles.

2. What is the process of photosynthesis, and why is it essential for life?

Photosynthesis is the process by which green plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose (a form of sugar) and oxygen. This process takes place in the chloroplasts of plant cells. Photosynthesis is essential for life because it is the primary way in which energy from the sun is converted into usable chemical energy in the form of glucose. This energy-rich glucose serves as a source of fuel for all living organisms and is the foundation of food chains and ecosystems.

3. What are enzymes, and what role do they play in biological processes?

Enzymes are biological molecules (proteins) that act as catalysts in various biochemical reactions. They play a crucial role in biological processes by speeding up chemical reactions, thus allowing them to occur at a faster rate and under optimal conditions within living organisms. Enzymes are highly specific, meaning each enzyme is designed to catalyze a particular reaction. They facilitate processes such as digestion, energy production, DNA replication, and cell signaling. Without enzymes, many essential biological reactions would occur too slowly to sustain life.

4. What is the difference between mitosis and meiosis?

Mitosis and meiosis are two types of cell division processes:

Mitosis: It is the process of cell division that occurs in somatic (body) cells. The main purpose of mitosis is growth, repair, and asexual reproduction. The division results in two identical daughter cells, each having the same number of chromosomes as the parent cell.
Meiosis: It is a specialized cell division process that occurs in the reproductive cells (gametes - sperm and egg). The main purpose of meiosis is to produce haploid gametes with half the number of chromosomes as the parent cell. Meiosis consists of two divisions, resulting in four genetically diverse daughter cells.

While mitosis is responsible for cell growth and repair, meiosis is essential for sexual reproduction and genetic diversity in offspring.

5. What are dominant and recessive alleles in genetics?

In genetics, alleles are different versions of a gene that occupy the same position (locus) on homologous chromosomes. Dominant alleles are those that exert their effect on the phenotype (physical traits) even when present in only one copy (heterozygous state). They are denoted by uppercase letters. On the other hand, recessive alleles are only expressed in the phenotype when present in two copies (homozygous recessive state). They are denoted by lowercase letters. If an individual carries one dominant and one recessive allele for a gene, the dominant allele's trait will be expressed.

Biology - Set-A Online Practice Exams