CSS - PMS - CCE - PCS - General Science
Pollination
Which animal group is especially important as pollinators for many flowering plants?
A. Earthworms only
B. Insects
C. Reptiles only
D. Fish only
Correct Answer: B
Bees and other insects pollinate a large number of flowering plants.
CSS - PMS - CCE - PCS - General Science
Pollination
What is cross-pollination?
A. Transfer of pollen between flowers on different plants of the same species
B. Pollen movement within one anther only
C. Seed dispersal by animals
D. Vegetative propagation
Correct Answer: A
Cross-pollination promotes genetic mixing between plants.
CSS - PMS - CCE - PCS - General Science
Pollination
What is self-pollination?
A. Fusion of two embryos
B. Seed movement by wind
C. Transfer of pollen to the stigma of the same flower or another flower on the same plant
D. Pollen transfer only between different species
Correct Answer: C
Self-pollination occurs within the same plant.
CSS - PMS - CCE - PCS - General Science
Pollination
What is pollination?
A. Seed dispersal only
B. Fusion of gametes
C. Transfer of pollen from anther to stigma in flowering plants
D. Root absorption of water
Correct Answer: C
Pollination precedes fertilization by moving pollen to a receptive female structure.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
Which plant hormone class was first identified partly through its effects on cell division in tissue culture?
A. Cytokinins
B. Carotenoids
C. Sterols only
D. Alkanes
Correct Answer: A
Cytokinins were characterized for their ability to promote cytokinesis in plant tissues.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
Which hormone is commonly involved in leaf and fruit abscission signaling?
A. Ethylene
B. DNA
C. Chlorophyll
D. Starch
Correct Answer: A
Ethylene participates in senescence and abscission processes.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
Which hormones often act antagonistically in seed dormancy and germination?
A. Abscisic acid and gibberellins
B. Auxin and water
C. Cytokinin and carbon dioxide
D. Ethylene and oxygen
Correct Answer: A
ABA tends to promote dormancy while gibberellins promote germination.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
Which hormone commonly promotes root initiation in plant cuttings?
A. Ethylene only
B. Gibberellin only
C. Abscisic acid
D. Auxin
Correct Answer: D
Synthetic and natural auxins are used to stimulate adventitious rooting.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
What is apical dominance largely associated with?
A. Ethylene destroying roots
B. Auxin produced near the shoot apex suppressing lateral bud growth
C. Cytokinin eliminating cell division
D. ABA increasing every side branch
Correct Answer: B
Auxin from the shoot tip contributes to suppression of axillary buds.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
Which hormone is strongly associated with seed dormancy and stomatal closure during water stress?
A. Ethylene
B. Cytokinin
C. Gibberellin
D. Abscisic acid
Correct Answer: D
ABA helps plants respond to drought and promotes dormancy.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
Which gaseous plant hormone promotes fruit ripening?
A. Auxin
B. Cytokinin
C. Ethylene
D. Gibberellin
Correct Answer: C
Ethylene is a gaseous hormone that coordinates ripening and several stress responses.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
Which plant hormone promotes stem elongation and seed germination in many plants?
A. Abscisic acid
B. Salicylic acid only
C. Gibberellin
D. Ethylene only
Correct Answer: C
Gibberellins promote growth processes including internode elongation and germination.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
Which plant hormone promotes cell division and can delay leaf senescence?
A. Ethylene
B. Cytokinin
C. Abscisic acid
D. Auxin only
Correct Answer: B
Cytokinins stimulate cytokinesis and influence shoot growth and senescence.
CSS - PMS - CCE - PCS - General Science
Plant Hormones
Which plant hormone is strongly associated with cell elongation and phototropism?
A. Cytokinin only
B. Ethylene
C. Abscisic acid
D. Auxin
Correct Answer: D
Auxin gradients help regulate differential growth such as bending toward light.
CSS - PMS - CCE - PCS - General Science
Genetics
What is a mutation?
A. A type of protein digestion
B. Any temporary change in mood
C. A change in genetic material
D. Only cell growth
Correct Answer: C
Mutations are alterations in DNA sequence or chromosome structure/number.
CSS - PMS - CCE - PCS - General Science
Genetics
What process produces gametes with half the usual chromosome number?
A. Binary fission only
B. Transcription
C. Meiosis
D. Mitosis
Correct Answer: C
Meiosis reduces chromosome number and generates genetic variation in sexually reproducing organisms.
CSS - PMS - CCE - PCS - General Science
Genetics
What is a recessive allele in simple Mendelian inheritance?
A. An allele that is always lethal
B. An allele without DNA
C. An allele whose effect is masked by a dominant allele in a heterozygote
D. An allele that cannot be inherited
Correct Answer: C
A recessive phenotype typically appears when no dominant allele is present at that locus.
CSS - PMS - CCE - PCS - General Science
Genetics
What is a dominant allele in simple Mendelian inheritance?
A. An allele found only on Y chromosome
B. An allele that never produces a trait
C. An allele expressed in a heterozygote
D. An allele that must always be rare
Correct Answer: C
In simple dominance, a dominant allele influences phenotype when one copy is present.
CSS - PMS - CCE - PCS - General Science
Genetics
Which scientist is famous for foundational pea-plant experiments on inheritance?
A. Robert Hooke
B. Charles Darwin
C. Louis Pasteur
D. Gregor Mendel
Correct Answer: D
Mendel's experiments established key principles of particulate inheritance.
CSS - PMS - CCE - PCS - General Science
Genetics
What does phenotype refer to?
A. Only chromosome number
B. Only DNA sequence
C. Observable traits resulting from genotype and environment
D. Only mutation rate
Correct Answer: C
Phenotype includes measurable or visible traits influenced by genes and environment.