CBSE Class 7 Science Advanced Biology Nutrition in Plants and Animals Very Short Answer Questions Set 01

Very Short Answer Questions

Question 1. Fill in the blank: Fungus is an example of ______ nutrition.
Answer:
Saprophytic
In simple words: A fungus feeds on dead and decaying matter.

Teacher's Note:
1. Saprophytes live on dead plants and animals.
2. Bread mould is a common fungus example.

Question 2. Fill in the blank: Venus flytrap is a/an ______ plant.
Answer:
Insectivorous
In simple words: It traps and digests insects.

Teacher's Note:
1. The plant gets its nitrogen from insects.
2. The pitcher plant is another example.

Question 3. Fill in the blank: Animal which eats other animal is called ______.
Answer:
Predator
In simple words: The hunter is the predator and the hunted animal is the prey.

Teacher's Note:
1. The tiger is a predator and the deer is its prey.
2. A predator is a carnivore.

Question 4. Fill in the blank: Sharp teeth is a characteristic feature of ______ animal.
Answer:
Carnivorous
In simple words: Flesh eaters need sharp teeth to tear meat.

Teacher's Note:
1. Pointed canines are used for tearing flesh.
2. Cow-like herbivores have blunt teeth for grinding.

Question 5. Fill in the blank: ______ have digestive system meant to digest both plants and animals.
Answer:
Omnivores (omnivorous animals)
In simple words: Omnivores can digest both plant food and flesh.

Teacher's Note:
1. Bear and human are omnivores.
2. Their teeth are suited for both kinds of food.

Question 6. Fill in the blank: Photosynthesis takes place in the presence of ______.
Answer:
Sunlight
In simple words: Plants need sunlight energy to make food.

Teacher's Note:
1. Chlorophyll absorbs the sunlight.
2. No light means no photosynthesis.

Question 7. Fill in the blank: Green pigment necessary for photosynthesis is ______.
Answer:
Chlorophyll
In simple words: Chlorophyll is the green colour in leaves that catches light.

Teacher's Note:
1. It also gives leaves their green colour.
2. It is present in the chloroplasts of the leaf cells.

Question 8. Fill in the blank: Flesh eaters are also called ______.
Answer:
Carnivores
In simple words: Animals that eat flesh are carnivores.

Teacher's Note:
1. Carni means flesh.
2. Tiger, lion and dog are examples.

Question 9. Fill in the blank: Bear is an example of ______ animals.
Answer:
Omnivorous
In simple words: A bear eats both plants and animals.

Teacher's Note:
1. Humans and ducks are other examples.
2. Omnivores have mixed teeth.

Question 10. Fill in the blank: During photosynthesis, ______ and water are used to make carbohydrates.
Answer:
Carbon dioxide (CO₂)
In simple words: Plants combine carbon dioxide and water to make glucose.

Teacher's Note:
1. Carbon dioxide enters through the stomata.
2. Oxygen is released as a by-product.

Question 11. Fill in the blank: Saliva is produced in mouth by ______.
Answer:
Salivary glands
In simple words: Salivary glands make the saliva that wets the food.

Teacher's Note:
1. Saliva contains the enzyme amylase.
2. Mumps is an infection of these glands.

Question 12. Fill in the blank: ______ is the site of absorption of nutrients after digestion.
Answer:
Small intestine
In simple words: Digested food is taken into the blood through the small intestine.

Teacher's Note:
1. The villi increase the absorbing area.
2. The ileum is the part where most absorption occurs.

Question 13. Fill in the blank: ______ is a small sac like structure where digestive waste is stored temporarily.
Answer:
Rectum
In simple words: Waste waits in the rectum before leaving the body.

Teacher's Note:
1. Waste leaves through the anus.
2. The rectum comes after the large intestine.

Question 14. Fill in the blank: Water is reabsorbed in ______.
Answer:
Large intestine
In simple words: The large intestine takes water back from the undigested waste.

Teacher's Note:
1. No enzyme is secreted in the large intestine.
2. The remaining waste becomes faecal matter.

Question 15. Fill in the blank: Opening at the end of digestive system is called ______.
Answer:
Anus
In simple words: Waste leaves the body through the anus.

Teacher's Note:
1. Egestion takes place through it.
2. The mouth is the opening at the start.

Question 16. Fill in the blank: ______ helps in the easy passage of food from oesophagus to stomach.
Answer:
Peristalsis
In simple words: Waves of squeezing and relaxing push the food down.

Teacher's Note:
1. It is caused by the muscles of the oesophagus.
2. It works even if you swallow upside down.

Question 17. Fill in the blank: ______ is the process of waste removal from body.
Answer:
Egestion
In simple words: Egestion means throwing out the undigested waste.

Teacher's Note:
1. It is the last of the five steps of nutrition.
2. Do not confuse it with ingestion, which is taking food in.

Question 18. Identify the word pair relationship: ______ : Autotrophs :: Carnivores : ______
Answer:
Green plants : Autotrophs :: Carnivores : Heterotrophs
In simple words: Green plants are autotrophs, and carnivores are a kind of heterotroph.

Teacher's Note:
1. Look at the relationship: example to group.
2. Carnivores depend on other organisms, so they are heterotrophs.

Question 19. What is gullet?
Answer:
The opening of the pharynx into the oesophagus is called the gullet.
In simple words: Gullet is the doorway from the pharynx to the oesophagus.

Teacher's Note:
1. Remember mouth, pharynx, gullet, oesophagus.
2. It lies inside the body, not at the outside.

Question 20. What is tongue and mention its function?
Answer:
The tongue is a muscular structure inside the mouth. It helps to mix the food with saliva and has taste buds that let us taste the food.
In simple words: The tongue mixes food with saliva and tastes it.

Teacher's Note:
1. Mention both functions for full marks.
2. Different parts of the tongue detect bitter, sour, salt and sweet.

Question 21. What is holozoic nutrition?
Answer:
Holozoic nutrition is the mode in which an organism takes in solid or liquid food, digests it, absorbs it, uses the energy and finally egests the undigested waste. Example: human beings.
In simple words: Taking in food, digesting it and throwing out the waste.

Teacher's Note:
1. Write all five stages in your answer.
2. Herbivores, carnivores and omnivores are all holozoic.

Question 22. What are insectivorous plants? Give examples.
Answer:
Insectivorous plants get some or most of their nutrients, especially nitrogen, by trapping and consuming small animals and insects. Examples: pitcher plant, Venus flytrap.
In simple words: These plants eat insects to get nitrogen.

Teacher's Note:
1. Always name the nutrient nitrogen.
2. Give at least two examples.