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1. The movement of a plant part in response to the force of attraction exerted by the earth is called ___________.
A. Hydrotropism
B. Geotropism
C. Chemotropism
D. Phototropism
ANSWER: B.Geotropism
SOLUTION :Geotropism is the growth of the parts of plants in response to the force of gravity. The upward growth of plant shoots is an instance of negative geotropism; the downward growth of roots is positive geotropism.
2. Which of the following statements is correct about receptors?
A. Gustatory receptors detect taste while olfactory receptors detect smell
B. Both gustatory and olfactory receptors detect smell
C. Auditory receptors detect smell and olfactory receptors detect taste
D. Olfactory receptors detect taste and gustatory receptors smell
ANSWER:A.Gustatory receptors detect taste while olfactory receptors detect smell
SOLUTION:The correct statement about receptors is that the Gustatory receptors detect taste while olfactory receptors detect smell.
3. Made up of only nucleic acid and proteins are ____________.
A. Bacteria
B. Chloroplast
C. Viruses
D. Prions
ANSWER :C.Viruses
SOLUTION:Viruses are made up of nucleic acid and proteins.
4. Which of the following is commonly known as ‘birth hormone’?
A. Prolactin
B. Oxytocin
C. ADH
D. FSH
ANSWER: B.Oxytocin
SOLUTION: Oxytocin stimulates the uterine muscles to contract and also increases production of prostaglandins, which increase the contractions further. That is why, oxytocin is called birth hormones.
5. A big tree falls in a forest, but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to____________.
A. Water and light
B. Water and minerals
C. Gravity and water
D. Light and gravity
ANSWER: D.Light and gravity
SOLUTION:light and gravity. The root shows positive geotropism while stem or other aerial parts of plant show negative geotropism. Hence, the plant stem grows towards the light in the upward direction against the force of gravity.
6. Which of the following gland is unpaired?
A. Adrenal
B. Testis
C. Pituitary
D. Ovary
ANSWER: C.Pituitary
SOLUTION:The pituitary gland is an unpaired endocrine gland located below the hypothalamus of the brain. It plays a significant role in bodily functions such as growth, metabolism, and sexual maturation. Other glands, such as the adrenal gland, testes, and ovaries, are paired.
7. The main function of the plant hormone called abscisic acid is to ________.
A. Increase the length of cells
B. Promote cell division
C. Inhibit growth
D. Promote growth of stem and roots
ANSWER:C.Inhibit growth
SOLUTION : By performing all these functions in plants, abscisic acid overall contributes in the inhibition of plant growth. Therefore, the correct answer is C, i.e. Inhibit growth.
8. The plant hormone which triggers the fall of mature leaves and fruits from the plant body is _________.
A. Auxin
B. Gibberellin
C. Abscisic acid
D. Cytokinin
ANSWER: C.Abscisic acid
SOLUTION: It is called abscisic acid because of the formation of the abscission layer which triggers fall of mature leaves and fruits from plants.
9. Name the harmone which is utilized to produce seedless fruit without fertilization _________.
A. Ethylene
B. Gibberellins
C. Auxins
D. None of there
ANSWER:C.Auxins
SOLUTION: Gibberellins (GAs) are plant hormones that regulate growth and influence various developmental processes, including stem elongation, germination, dormancy, flowering, sex expression, enzyme induction, and leaf and fruit senescence. Gibberellin hormone is used to produce seedless fruits.
10. The main function of abscisic acid in plants is to________.
A. Increase the length of cells
B. Promote cell division
C. Inhibit growth
D. Promote growth of stem
ANSWER: C.Inhibit growth
SOLUTION:
Abscisic acid (ABA) is a plant hormone that inhibits plant growth. It does this by preventing or inhibiting cell division and expansion, and by counteracting hormones that promote growth. ABA also helps plants adapt to unfavorable environmental conditions, such as drought, freezing temperatures, and reduced day length.