Class 7 Science Chapter 1 Question Answers - Nutrition in Plants

Q. 1: Name some components of food.

Ans: Carbohydrates, proteins, fats, vitamins and minerals.

Q. 2: Define nutrients.

Ans:  Carbohydrates, proteins, fats, vitamins and minerals are essential components of food; these components are called nutrients.

Q. 3: Give an example of an autotroph.

Ans: All green plants.

Green plants

Q. 4: Give an example of a heterotroph.

Ans: Animals and human beings.

Q. 5: Plants prepare their food by using raw materials present in their  __________________.

Ans: Surroundings.

Q. 6: What do you mean by nutrition?

Ans: Nutrition is the mode of taking food by an organism and its utilisation by the body.

Q. 7: Name the food factories of plants.

Ans: Green leaves.

 Green leaves

Q. 8: Name the tiny pores present on the surface of leaves.

Ans: Stomata

Q. 9: Name the green pigment present in leaves.

Ans: Chlorophyll

Q. 10: ____________ helps leaves to capture the energy of sunlight

Ans: Chlorophyll

Q. 11: Why is photosynthesis named so?

Ans: Because the synthesis of food occurs in the presence of sunlight.

Q. 12: The Sun is the ultimate source of energy for all living organisms. True / False

Ans: True

Q. 13: Where does the nucleus of a cell lie?

Ans: The nucleus lies in the cytoplasm of the cell (not always exactly in the centre).

 Cell

Q. 14: State the equation for the process of photosynthesis.

Ans: Carbon dioxide + water —————> carbohydrate + Oxygen(in the presence of sunlight)

Q. 15: The nucleus in a cell is surrounded by a jelly-like substance called ___________.

Ans: Cytoplasm

Q. 16: Why are algae present in stagnant water bodies green in colour?

Ans: Because they contain green colour pigment chlorophyll.

 Chlorophyll cellsQ. 17: Name a component of food other than carbohydrate synthesised by plants.

Ans: Proteins and Fats

Q. 18: Name some insectivorous plants.

Ans: Pitcher plants and Venus flytraps are insectivorous plants.

Q. 19: In the saprotrophic mode of nutrition, organisms take in nutrients from
a. Oxygen mask
b. Water mask
c. Pollution mask
d. None of these

Ans:  d. None of these
(They take nutrients from dead and decaying matter.)

Q. 20: During photosynthesis plants take in _______________ and releases _______________.

Ans: Carbon dioxide and oxygen

Q. 21: Some organisms live together and share shelter and nutrients, this type of relationship is called

Ans: Symbiotic relationship.

Q. 22: Lichen is a symbiotic association between __________ and Fungi.

Ans: Algae and Fungi.

Q. 23: Name the edible fungi.

Ans: Mushroom.

Q. 24: Name the organism responsible for converting atmospheric nitrogen into soluble forms.

Ans: Rhizobium bacteria.

Q. 25: Where can we see Rhizobium bacteria?
​a. Dead matter
b. Decaying matter
c. Both a and b
d. None of these

Ans: d. None of these  
​Rhizobium bacteria are found in root nodules of leguminous plants, not in dead or decaying matter.

Q. 26: Give an example of parasites.

Ans: Cuscuta plants.

Cuscuta Plant

Q. 27: Give an example of saprotrophs.

Ans: Fungi

Q. 28: Amarbel is an example of
​a. Parasite
​b. Host
​c. Autotrophs
​d. Saprotrophs

Ans: Parasite

Q. 29: Carbon dioxide is released during photosynthesis. True/ False.

Ans: False

Q. 30: During photosynthesis solar energy is converted into chemical energy. True/ False.

Ans: True

Q. 31: The product of photosynthesis is
a. Carbohydrate
b. Protein
c. Fats
d. All of these

Ans: a. Carbohydrate

Q. 32: Name a plant that has both autotrophic and heterotrophic mode of nutrition.

Ans: Insectivorous plants

Q. 33: Name a parasitic plant with a yellow, slender and tubular type of stem.

Ans: Amarbel (Cuscuta).

Q. 34: Name the pores present in leaves through which exchange of gas takes place.

Ans: Stomata

Q. 35: Animals are autotrophs. True/ False.

Ans: False