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Problems

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235 problems
Type:
1.
Put these parts in the order in which a sperm passes through them: urethra, testis, vas deferens. New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Easy
2.
Suppose a woman's ovaries release one egg each month from the age of 13 to the age of 49, with no… New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Medium
3.
Rohit asks why the testes hang outside the body cavity, where they seem less protected. New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Easy
4.
A zygote divides into two cells, and every cell divides again at each step. New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Easy
5.
Sunita's menstrual cycle is 28 days long, and each period lasts about 5 days. New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Medium
6.
Name two substances that pass from the mother to the embryo through the placenta, and one that… New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Medium
7.
A doctor counts a pregnancy as about 280 days. New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Easy
8.
A town has 4820 girls and 5200 boys under six years of age. New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Medium
9.
Match each method of contraception to the way it works: (a) condom, (b) hormone pill, (c) copper-T… New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Medium
10.
In a district, there were 10 000 boys under six in both of two surveys. New
High School (9–10), General · Human ReproductionStemPy LabStemPy Lab
Hard
11.
A pond holds millions of bacteria of one kind. New
High School (9–10), General · Reproduction in Plants, Heredity and InheritanceStemPy LabStemPy Lab
Easy
12.
In a lab culture, about 1 in 500 new cells carries a small change in its DNA. New
High School (9–10), General · Reproduction in Plants, Heredity and InheritanceStemPy LabStemPy Lab
Medium
13.
Banana plants on a large farm are all grown from suckers of a single parent, so they are almost… New
High School (9–10), General · Reproduction in Plants, Heredity and InheritanceStemPy LabStemPy Lab
Medium
14.
An Amoeba in a drop of pond water divides by binary fission every 45 minutes, and every daughter… New
High School (9–10), General · Reproduction in PlantsStemPy LabStemPy Lab
Easy
15.
A teacher cuts one Planaria into five pieces and keeps them in clean pond water. New
High School (9–10), General · Reproduction in PlantsStemPy LabStemPy Lab
Easy
16.
On a damp slice of bread, Rhizopus forms 40 sporangia, and each releases about 3000 spores. New
High School (9–10), General · Reproduction in PlantsStemPy LabStemPy Lab
Medium
17.
A nursery plants 60 rose cuttings, and 85% of them grow roots. New
High School (9–10), General · Reproduction in PlantsStemPy LabStemPy Lab
Medium
18.
In an aquarium, a Hydra makes one bud every 4 days. New
High School (9–10), General · Reproduction in PlantsStemPy LabStemPy Lab
Hard
19.
On a pea plant, 18 flowers are pollinated. New
High School (9–10), General · Reproduction in PlantsStemPy LabStemPy Lab
Easy
20.
Ravi's papaya tree flowers every year but never bears fruit. New
High School (9–10), General · Reproduction in PlantsStemPy LabStemPy Lab
Medium
21.
Put these events in the right order, and explain the link between the second and the third: the… New
High School (9–10), General · Reproduction in PlantsStemPy LabStemPy Lab
Hard
22.
Read the four descriptions and name the pattern of each life cycle. New
High School (11–12) · Plant Life Cycles and Alternation of Generations, Gymnosperms and AngiospermsStemPy LabStemPy Lab
Medium
23.
A Chlamydomonas zygote divides by meiosis. New
High School (11–12) · Plant Life Cycles and Alternation of Generations, Gymnosperms and AngiospermsStemPy LabStemPy Lab
Medium
24.
In a moss, a fern and a pine, say which generation is the main plant, and whether the other… New
High School (11–12) · Plant Life Cycles and Alternation of Generations, Gymnosperms and AngiospermsStemPy LabStemPy Lab
Hard
25.
A botany student lists five plants: Cedrus, Mangifera (mango), Ginkgo, Oryza (rice) and Cycas. New
High School (11–12) · Gymnosperms and AngiospermsStemPy LabStemPy Lab
Easy
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