Biology: CUET Mock Test - 5 - Class 12 MCQ

Thomas Malthus is the author of the book Principles of population. According to him, the population grows geometrically whereas food grows only arithmetically. Charles Darwin was inspired by this theory.

Allele frequencies does not vary from species to species. In a population, the frequency always remains fixed or constant according to Hardy Weinberg principle. The alleles and total genes in any population remain constant and hence stable.

Homo habilis was also known as tool maker or handy man. It was the first man who made tools of stones for hunting animals. They lived in caves.

During the paralytic stage, motor nerves are affected resulting in atrophy of muscles, generally of arms and legs but may affect those of diaphragm, larynx and pharynx. So, Motor Pathway is affected during the paralysis of muscles.

Fc region of an antibody is also called as a Fragment of Crystallization. It is responsible for the effector function. It is also called a constant region. It determines the isotype of an immunoglobulin.

The two key concepts of Darwin’s theory of evolution was branching descent and natural selection. Nature selects the fittest species. Adaptive ability is inherited and has a genetic basis. So, they were the two major concepts.

According to Hardy Weinberg principle, the total sum of all the frequencies of the allele is one. It shows that the gene pool remains the same or constant, i.e. one. Hence, it can be also termed as genetic equilibrium.

They had a cranial capacity of 650-800 c.c. They were the first human being like and had complete erect posture similar to them. They had the knowledge to create tools of stones to hunt.

Poliovirus generally affects the Motor Pathway of the neurons. It causes atrophy of muscles which affect the voluntary muscles of limbs and resulting in deformities. But, if the muscles of Diaphragm, Larynx and Pharynx are affected, it is always fatal.

Each antibody molecule has four peptide chains, two long chains called heavy or H chain each of molecular weight 50,000 Da and two short chains called light or L chains each of approximate molecular weight 25,000 Da.

Lamarck was a French naturalist born in 1744. He was famous for his book Philosophie Zoologique in 1809. He came up with the theory of inheritance of acquired characters.

The Hardy Weinberg equation is p² + 2pq + q² = 1. Here, p² denotes the allele of AA and q² denotes the allele aa. This shows that p, q, and A, a are related in multiplication. So, 2pq represent Aa.

On 27 March 2014, the World Health Organisation declared India a polio-free country. Polio eradication programme began internationally in 1988. It was initiated in India in 1995.

Fab region of an antibody is also called a variable region. The Fab portion is so called because it is the fragment of the molecule which is antigen binding or a paratope.

According to Lamarck, the evolution of life forms had occurred but driven by use and disuse of organs. It was among Lamarck’s basic concepts. Using an organ continuously increases its development whereas disuse of it results in its degeneration.

Individual frequencies can be represented as p and q. But for a diploid organism, p and q explain the frequency of allele A and allele a. p² represents AA whereas q² represent aa.

Homo erectus were known as the direct ancestors of humans. It had many similarities to modern man. Their face, skull structure, and posture were the same.

Flavivirus group causes Dengue and Yellow fever. This virus spreads through ticks and mosquitoes. Aedes aegypti mosquito spreads dengue fever, while Aedes and Haemagogus mosquitoes act as vectors for yellow fever.

An ovule is an integumented megasporangium found in spermatophytes which develops into a seed on fertilization. The cells within the megasporangium are diploid which will divide via meiosis to form 4 megaspores.

Giraffes were the main examples of Lamarck’s use and disuse theory. Giraffes continuously used their short necks to reach tall trees for leaves. So, this resulted in the elongation of their necks.

The ovules grow and mature on the parenchymatous cushion in the ovary, also known as the placenta. Placenta is the medium through which young ovules get nutrition. The ovules may appear singly or in a cluster.

Homo erectus was classified into Java man, Peking man and Heidelberg man. Cromagnon man belongs to Homo sapiens and not Homo erectus. Homo erectus were found 1.5 million years ago during the Mid-Pleistocene.

Fragile blood vessels are not the symptom of Classic Dengue Fever, instead it is a symptom of Dengue Haemorrhagic Fever(DHF). It is a fatal form of dengue fever which starts with fever, nausea, headache, abdominal pain, cold extremities with haemorrhagic spots, internal bleeding leading to blood in stools, urine and vomiting.

IgG antibodies constitute 75% of the total antibodies present in the blood. It is present in the monomer form and has two paratopes. It also evokes the complementary system and Opsonisation.

Struggle for existence was a concept of Darwin and not Lamarck’s. It states that every species competes with the same and other species for food, shelter, etc. to survive. Whereas, the remaining options support Lamarck’s concept of inheritance of acquired characters.

Hardy Weinberg stated that there are six factors affecting this principle. They are Gene migration or gene flow, genetic drift, mutation, genetic recombination, and natural selection. Each factor plays a major role in evolution.

Homo erectus erectus, also known as Java man used fire for hunting, protection, and cooking. It had complete erect posture and lived in caves. It used tools of bones and stones.

The mass of parenchymatous cells are also known as the Nucellus. It maybe massive (crassinucellate ovule) or thin (tenuinucellate ovule). Its surrounded by one or more teguments.

IgG is the smallest of all the antibodies. Also, it is the only antibody that can cross the placenta and confer immunity to the foetus. It only has two paratopes.

Passage or pore present at the end of the ovary is called a micropyle. It is a small opening through which water, air, nutrients, etc. go. This pore or passage is left by integuments.