Biology Test 144

Motor neurons in the nuclei of the brainstem cranial nerves are homologous to the spinal cord anterior horn cells. The destruction of the anterior horn cells of the spinal cord would result in the loss of voluntary motor impulses because it is majorly related to the motor impulses.

Hence, the correct option is (A).

Dragonflies and damselfly undergo incomplete metamorphosis; unlike other winged insects, such as butterflies do not have a pupal stage and transition straight from a larva to an adult.
Hence, the correct option is (D).

Bacillus thuringiensis a gram-positive bacteria which are generally used as a pesticide. It works on many plants eating insects. It gives out toxins during sporulation that stops the gut of insects and kills them. Naturally, occurring Bacillus thuringiensis is contained within the bacterium. Bt has a very short half-life when they are exposed to sunlight and the elements.

Hence, the correct option is (A).

In terminal Oxidation, NADH and FADH are oxidized. The energy liberated during oxidation is used in the synthesis of ATP and ADP and inorganic phosphate. Hydrogen is ultimately oxidized by oxygen to form water. Terminal oxidation takes place over the inner membrane of mitochondria.

Oxysomes are the structures that are present on the surface of the folded Inner Membrane of the Mitochondria. They are also called f0-f1 particles or ATP synthase. They play the most important role in the formation of energy for the functioning of the cell.
Hence, the correct option is (D).

Water hyacinth has single spike of 8-15 conspicuous attractive flowers which attract bees and other insects. These insects pollinate them. This plant is an aquatic weed. The water lily is also an aquatic plant with large conspicuous and colored flowers. Most of the species are bee pollinated except few species in which wind-pollinated occurs.

Hence, the correct option is (C).

The most serious complication facing Monochorionic monoamniotic (MCMA) twins is a life-threatening vascular accident related to the entanglement of the twin umbilical cords. This complication can result in the death of one or both twins. In earlier series, fetal mortality rates of over 50% were reported.

Hence, the correct option is (D).

The premolars also called premolar teeth, are transitional teeth located between the canine and molar teeth. It is four in number and are absent in infants which is actually replaced by the molars in the later stages. In humans, there are two premolars per quadrant in the permanent set of teeth, making eight premolars total in the mouth. Premolars can be considered transitional teeth during chewing or mastication. 

Hence, the correct option is (B).

Nastic movements are non-directional responses to stimuli (e.g. temperature, humidity, light irradiance), and are usually associated with plants. The movement can be due to changes in turgor or changes in growth.

Nastic movements differ from tropisms in two ways. The direction of the response is independent of the direction of the stimulus. Changes in osmotic pressure, rather than growth, cause this kind of movement.

Hence, the correct option is (B).

Animals that give birth to offspring are called viviparous. In viviparous animals, both fertilization, as well as the development of the embryo, takes place inside the female reproductive system. Once the fetus development is complete, the mother delivers the baby. This condition is referred to as matrotrophy where the embryo obtains the nutrients directly from the mother and not the yolk.
Hence, the correct option is (A).

Brassicaceae species are characterized by four-petalled cross-shaped flowers that feature two long and two short stamens and produce podlike fruits known as siliques.

Brassicaceae is a medium-sized and economically important family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family.

Hence, the correct option is (B).