Correct Answer: B) commensalism

Explanation

The question is asking about the meaning of an association indicated by the sign +0. The + sign is used to indicate a relationship where an organism gains, while 0 is used when an organism is unaffected. So, the combination of + and 0 indicates an association where one organism benefits while the other is not affected. This type of association is known as commensalism, which is a type of symbiotic relationship between two organisms in which one organism benefits, while the other organism is neither helped nor harmed. In this relationship, the organism that benefits is called the commensal, while the other organism is called the host. For example, a bird building its nest in a tree is an example of commensalism. The bird benefits by having a safe place to lay eggs and raise its young, while the tree is not affected by the bird's presence. In summary, an association indicated as +0 is known as commensalism, which is a type of symbiotic relationship where one organism benefits while the other is neither helped nor harmed.

Correct Answer: D. germination

Correct Answer: C. positive thermotaxis

Correct Answer: A. two pairs of antennae

Correct Answer: C) NADPH and ATP are synthesized using electron released from water

Explanation

During photosynthesis, plants undergo two main processes: light-dependent reactions and light-independent reactions. The light-dependent reactions occur in the thylakoid membranes and require light energy to produce ATP and NADPH, which are used in the light-independent reactions. The given question focuses on the light-dependent reactions and asks what happens during this process. Option A, glucose formation, occurs during the light-independent reactions. Option B, carbon IV oxide fixation, occurs during the Calvin cycle, which is also part of the light-independent reactions. Option D, splitting of water and using the electrons for glucose synthesis, is not a correct statement. Therefore, option C is the correct answer. During the light-dependent reactions, photosystem II absorbs light energy and uses it to split water molecules into oxygen, hydrogen ions, and electrons. The electrons are then passed through a series of electron carriers, which ultimately results in the synthesis of ATP and NADPH. These energy-rich molecules are then used in the light-independent reactions to produce glucose.

Correct Answer: B. sebaceous glands

Correct Answer: A. Two

Explanation

A hydrocarbon is made up of a carbon and two hydrogen atoms attached to it.

Correct Answer: D. rhizopus, housefly and hydra

Correct Answer: C) Natural selection

Explanation

The question is asking about the term used to describe when some organisms with certain features become established in an environment. This phenomenon is called natural selection. Natural selection is a process where organisms that are better adapted to their environment have a greater chance of survival and passing on their traits to their offspring. These adaptations can be physical characteristics, behaviors, or even genetic mutations. It is important to note that natural selection is a key mechanism of evolution. Over time, as organisms continue to adapt to their environment, they may evolve into new species. This process can take millions of years and is influenced by many factors such as changes in the environment and genetic variation within a population. Artificial selection, on the other hand, is when humans intentionally breed plants or animals for specific traits, such as larger fruits or a certain coat color. Partial selection is not a term used in biology and mutation refers to a change in the genetic material of an organism. In summary, the correct answer to this question is natural selection, which is the process whereby organisms that are better adapted to their environment have a greater chance of survival and passing on their traits to their offspring.

Correct Answer: C. birds