user: Q: Lead shielding is used to block what type of rays?   Read this paragraph and choose the correct option from the provided answers:  Look at the classroom in Figure below . It has several sources of visible light. One source of visible light is the sun. Sunlight enters the classroom through the windows. The sun provides virtually all of the visible light that living things need. Visible light travels across space from the sun to Earth in electromagnetic waves. But how does the sun produce light? Read on to find out.   Choices:  - ultraviolet  - alpha  - toxic  - gamma   A:
gamma


(Question)
Q: What are the insects that suck up the sap from plants?   Read this paragraph and choose the correct option from the provided answers:  Insects eat in many different ways and they eat a huge range of foods. Around half are plant-eaters, feeding on leaves, roots, seeds, nectar, or wood. Aphids and leafhoppers suck up the sap from plants. Praying mantises are predators, hunting other small creatures, including insects like moths, caterpillars, flies, beetles, and spiders. Insects like mosquitoes and aphids have special mouthparts that help them pierce and suck. Others, like assassin bugs ( Figure below ) and certain species of female mosquitoes, eat other insects. Fleas and lice are parasites, eating the flesh or blood of larger animals without killing them.   Choices:  - plagues and leafhoppers  - butterflies and leafhoppers  - roaches and leafhoppers  - aphids and leafhoppers   A:
(Answer)
aphids and leafhoppers


Ques: Q: What planet is closest to our sun?   Read this paragraph and choose the correct option from the provided answers:  Mercury is very close to the Sun, so it can get very hot. Mercury also has virtually no atmosphere. As the planet rotates very slowly, the temperature varies tremendously. In direct sunlight, the surface can be as hot as 427°C (801°F). On the dark side, the surface can be as cold as –183°C (–297°F)! The coldest temperatures may be on the insides of craters. Most of Mercury is extremely dry. Scientists think that there may be a small amount of water, in the form of ice, at the planet's poles. The poles never receive direct sunlight.   Choices:  - Earth  - Venus  - Pluto  - mercury   A:
Ans: mercury


(Q).
Q: Dna replication, chromosome segregation, and the separation into two daughter cells are steps in what process?   Read this paragraph and choose the correct option from the provided answers:  Binary fission can be described as a series of steps, although it is actually a continuous process. The steps are described below and also illustrated in Figure below . They include DNA replication, chromosome segregation, and finally the separation into two daughter cells.   Choices:  - reproductive fission  - nuclear fission  - multiple fission  - binary fission   A:
(A).
binary fission


Ques:Q: What does the armor including spines in some species offer?   Read this paragraph and choose the correct option from the provided answers:     Choices:  - nutrition  - protection from cold  - energy  - protection from predators   A:

Ans:protection from predators


Ques:Q: Like mammals and birds, and unlike other reptiles, crocodiles have how many chambers in their heart?   Read this paragraph and choose the correct option from the provided answers:  Like mammals and birds, and unlike other reptiles, crocodiles have a four-chambered heart. But, unlike mammals, blood with and without oxygen can be mixed.   Choices:  - one  - six  - two  - four   A:

Ans:

assistant: four