Class 12 Biology 2019 Overseas MCQs Test

Which of the following are important members of crustose lichen stage in ecological succession on rock surface?

All of the following are excitatory neurotransmitters EXCEPT:

Based on changes and hormonal regulation the female reproductive cycle can be divided into three phases i.e., menstrual phase, proliferative phase and:

The blastocyst is a fluid-filled hollow sphere composed of a single layer of large, flattened cells called _____ and a small cluster of 20 to 30 rounded cells inside it.

In DNA replication process, the replacement of primers by DNA nucleotides is out by:

The process of introducing new plants from their growing place to new locality with different climate is termed as:

After an action potential, nerve fiber undergoes a period of recovery in which it regains its original ionic distribution and polarity and prepares itself for the next stimulation. This period of recovery of nerve fiber is called:

Which of the following type of joints is found between the shaft regions of the long bones in the forearm and in the leg?

Mr. John has a B+ve blood group while his wife has B-ve, they have one child, who has an O-ve blood group. What is the probability of O+ve daughter in the next pregnancy?

The animals which are hypotonic to their outer environment are:

Which of the following causes the RNA polymerase to stop the synthesis of RNA?

If a red wheat grain plant having genotype (Aabbcc) is self-fertilized, what will be the expected ratio of dark red wheat grain plants (AABBCC) to white grain wheal plants (aabbcc)?

Which of the following hormones acts as the first messenger that binds with its receptor on the plasma membrane of a target cell, starting a series of events in the ceil which generates the second messenger?

A type of learning behavior in which an animal temporarily learns to ignore a repealed, irrelevant stimulus, is called:

Which of the following is represented by “1” in the given equation (p² + 2pq + q² = 1)?

Which of the following combination of events is related to the expiration phase of breathing?

Diaphragm — External intercostal muscles — Internal intercostal muscles

In the DNA test, after hybridization, excess probes are washed from the membrane, and the pattern of hybridization is visualized on X-ray film by exposing the membrane to an X-ray source. This technique is known as: