A. Leaves respire and utilize O2 and release CO2.
B. Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants.
C. Rate of photosynthesis increases, so do the O2 production, with a net release of oxygen coupled with the uptake of CO2.
D. Rate of respiration becomes more than rate of photosynthesis.

Related Mcqs:

  1. In condition of high temperature, following does not occur or occurs at low level__________?

    A. Vasodilation
    B. Activation of sweat glands
    C. Thermogenesis
    D. Evaporative cooling

  2. On which of the following component of chloroplast chlorophyll is arranged?

    A. Cell membrane
    B. Matrix
    C. Thylakoids
    D. Stroma

  3. Radiolarians belong to which of the following protozoal group____________?

    A. Zooflagellates
    B. Actinopods
    C. Foraminifera
    D. Apicomplexans

  4. During the process of cell division which of the following divides first?

    A. cytodplasm
    B. vacuoles
    C. mitochondria
    D. nucleus

    Submitted by: Muhammad Nawaz

  5. Which of the following are responsible for the detection of changes in environment?

    A. Receptors
    B. Neurons
    C. Effectors
    D. All of these

  6. Which of the following is second largest part of the brain_______________?

    A. Cerebrum
    B. Cerebellum
    C. Thalamus
    D. Hypothalamus

  7. Which of the following statement about the head of a chlorophyll molecule is incorrect?

    A. It is a porphyrin ring or tetrapyrrole ring structure
    B. It is flat, square and light absorbing
    C. Composed of carbon and nitrogen atoms with Magnesium as central metal ion, which is coordinated with nitrogen.
    D. It is hydrophobic

  8. Which of the following plays the major role in providing support to young herbaceous parts of the plant?

    A. Living cells of epidermis with higher turgor pressure.
    B. Living cells of cortex and pith with higher turgor pressure.
    C. Collenchyma cells
    D. All of these

  9. Which of the following cells secrete insulin?

    A. Alpha cells
    B. Delta cells
    C. Nerve cells
    D. Beta cells

    Submitted by: Malik Asghar Hussain

  10. Plasmids are used as cloning vectors for which of the following reasons?

    A. Can be multiplied in culture
    B. Self-replication in bacterial cells
    C. Can be multiplied in laboratories with the help of enzymes
    D. Replicate freely outside bacterial cells

    Submitted by: Maria Aziz

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