SAT (Stage-1) Mock Test - 49

Chlorophyll is the green pigment in the plants that helps to trap the energy of the sun in order to prepare food (carbohydrates) from inorganic substances, which are CO₂ and H₂O. It is the complex salt of magnesium. Hence, magnesium has an important role in photosynthesis because it forms the central atom of chlorophyll.

Manure, compost and humus are the examples of bio-fertilisers, whereas potash is an example of chemical-fertiliser. Biofertilizers are the substance that contains microorganism's living or latent cells. Biofertilizers increase the nutrients of host plants when applied to their seeds, plant surface or soil by colonizing the rhizosphere of the plant.

Chromosomes become visible, the nucleolus disappears, the mitotic spindle forms, and the nuclear envelope disappears. Each duplicated chromosome is seen as a pair of sister chromatids joined by the duplicated centromere.

Unstriated muscles are smooth, involuntary muscles. Each muscle fibre is a long, narrow, spindle-shaped tapering cell. The cell is uninucleate. Delicate threads called myofibrils run longitudinally through the cell.

The common link for these three very different diseases (malaria, acute diarrhoea and cholera) is their relationship with water. Cholera, a bacterial illness, can be acquired when sources of drinking water have been contaminated by Vibrio cholerae bacteria. Major cause of diarrhoea is drinking unclean water. Stagnant water is the breeding ground for mosquitoes causing malaria.

Helicobacter pylori is a Gram-negative, microaerophilic, bacterium found in the stomach. It is linked to the development of peptic ulcers and stomach cancer.

Lactobacilli are called rod-shaped because they are usually straight, although they can form spiral or coccobacillary forms under certain conditions.

Hypercholesterolemia is the presence of high levels of cholesterol in the blood due to eating diet rich in butter, meat and eggs, etc.

Since both parents are brown eyed and the child is blue eyed (bb) therefore both the parents can not be pure dominant or pure recessive so the genotype of parents must be Bb × Bb.

The dwarf honey bee Apis florea is a species of small, wild honey bees of southern and south-eastern Asia.

There are very few decomposers in a desert ecosystem. Due to poor vegetation, the amount of dead organic matter is correspondingly less. There are some fungi and bacteria in a desert ecosystem most of which are thermophilic.

Centre for willpower and personality lies in the frontal lobe of cerebrum.

According to Darwin's theory, there is competition and struggle among organisms for food, space and other conditions and only those which are best suited to that environment due to their adaptations can survive.

This is the correct option. Nageri is a draught breed of cows. It is found in Haryana and Uttar Pradesh.