Question

During dissections - which protective gear should you ALWAYS wear? lab coat long pants hair net close toed shoes gloves googles QUESTION 3 What is the function of the muscular foot in mollusks? houses organs protects the body C produces the shell clocomotion and prey capture QUESTION 4 What type of diet do animals in class Polyplacophora mostly have? herbivorous; algae C carnivorous; small marine animals parasitic; large marine mammals herbivorous; vascular plants

Answer 1

Question-1

During dissections, you should wear following protective gear

a.) Lab coat: A coat is must during dissections. A long-sleeved gown type coat is always recommended.

d.) Close toed shoes: Shoes that completely cover the foot should be worn and that to spill proof which doesn't allow liquid to penetrate quickly.

e.) Gloves: This is a must have during dissections as you will be touching samples and organisms.

f.) Googles/Goggles: Proper safety goggles must be used in order to protect your eye. This is because there might be chemicals that can cause eye damage.

Excluded options:

b.) Long pants: Are acceptable, but not recommended, alternative is to wear lab coat such that your knees are covered when you are sitting down.

c.) Hair Net: It is not essential. Tying your hair properly would suffice.

Question-3

Correct Answer: The function of the muscular foot is for locomotion and prey capture.

Explanation: The basic function of it in every molluscs is locomotion or movement, but in certain mollusks like cuttlefish’s and squids they use it as tentacles and arms. This structure is used to capture prey and also help them in locomotion as well.

Wrong answers:

- houses organs: The function of foot is not to harbour organs but for some action or movement.

- protects the body: There is shell like structure in mollusk to protect themselves from predators. Famous example is snail.

- produces shell: Mollusk have two organs- a feeding organ called radula and other one is mantle. Out of many functions of mantle, the organ also secretes the shell. Hence the option is ruled out.

Question-4

Correct Answer: herbivorous; algae

Explanation: They mostly are herbivores. They eat algae, diatoms and sometimes bacteria also. Though some are omnivorous and carnivorous as well.

Wrong answers:

- carnivorous; small marine animals: There are some species which eat carnivorous food but the major consumption is algae, diatoms and bacteria as mentioned above.

- parasitic; large marine animals: They mostly don't show parasitism and they are small animals itself so it is not possible to engulf a large marine animal.

- herbivorous; vascular plants: They do eat marine plants but the question is about major consumption. Hence this option is ruled out.

Figure Question:

Answer: The indicated structure in the figure are Adductor muscles.

Explanation: The figure shows the animal Clam. Clam is type bivalve mollusks having two shells. Adductor muscles are strong and powerful lateral muscles on both sides which allow the animal to close shut and open. Their contraction and relaxation allow this opening and closing movement. These muscles also allow the clams to swim.