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Q1. Which of the following does not show parasitic nutrition?

• Bladderwort
• Mistletoe
• Loranthus
• Cuscuta

Solution

Cuscuta, Loranthus and Mistletoe show parasitic nutrition. Bladderwort shows insectivorous nutrition.

Q2. Which of the following is not a heterotroph?

• Algae
• Yeast
• Cow
• Deer

Solution

Algae are a large group of simple, plant-like organisms which can prepare their own food and hence are classified under autotrophs.

Q3. Which of the following is considered as the food factory of a plant? 

• Leaf
• Stem
• Flower
• Root

Solution

The leaf is considered as the food factory of a plant because the synthesis of food by the process of photosynthesis takes place in the leaf.

Q4. Herbivorous animals consume

• Only plants
• Only animals
• Only microorganisms
• Both plants and animals

Solution

Herbivorous animals consume only plants as their food.

Q5. Plants are called autotrophs as they

• Can prepare their own food
• Depend on other organisms for food
• Do not have the capacity to prepare food
• Cannot obtain raw materials to prepare food

Solution

Plants are called autotrophs as they can prepare their own food from simple raw materials by the process of photosynthesis.

Q6. Autotrophic nutrition is seen in

• Fungi
• Human beings
• Plants
• Parasites

Solution

Autotrophic nutrition is seen in plants. Fungi, parasites and human beings show heterotrophic nutrition.

Q7. Which of the following plants depend on other plants or animals for their food requirements?

• Mushroom
• Rose
• Hibiscus
• Tulsi

Solution

Non-green plants like mushroom, yeast and bread mould do not have chlorophyll to prepare their own food. Therefore, they depend on other plants or animals for their food requirements and hence are called heterotrophs.

Q8. Autotrophic nutrition is seen in

• Fungi
• Human beings
• Plants
• Parasites

Solution

Autotrophic nutrition is seen in plants. Fungi, parasites and human beings show heterotrophic nutrition.

Q9. The green pigment present in leaves which absorbs energy from sunlight is

• Xanthophyll
• Chlorophyll
• Phytochrome
• Bilirubin

Solution

The green pigment present in the chloroplast of leaves is chlorophyll. It absorbs energy from sunlight during the process of photosynthesis.

Q10. Starch stored in the leaves after photosynthesis is a

• Vitamin
• Protein
• Mineral
• Carbohydrate

Solution

Starch stored in the leaves after photosynthesis is a carbohydrate. This starch gets stored as food in the various parts of a plant including leaves.

Q11. Which of the following fixes atmospheric nitrogen into the soil?

• Rhizobium
• Lactobacillus
• Cuscuta
• Mycobacterium

Solution

Rhizobium bacteria present in the root nodules of leguminous plants fix up atmospheric nitrogen into the soil. They convert nitrogen gas present in air into nitrogenous compounds like nitrates.

Q12. Which of the following is not correctly matched?

• Chlorophyll : Absorbs light energy
• Guard cells : Control opening and closing of stomata
• Xylem : Transport food from leaves to plant parts
• Spiny leaves : Reduce loss of water by transpiration

Solution

Xylem transports water from the roots of a plant to its leaves while phloem transports food from the leaves to different parts of the plant.

Q13. What kind of leaves are found in desert plants?

• Flat
• Oval
• Conical
• Spiny

Solution

Desert plants have tiny, spine-like leaves to reduce the loss of water by transpiration.

Q14. The mineral required by the plants to make proteins is

• Calcium
• Iodine
• Potassium
• Nitrogen

Solution

Plants require nitrogen for the production of amino acids that make up proteins. Proteins are needed for healthy growth and development of the plant body.

Q15. Plants without chlorophyll depend on _________ mode of nutrition.

• Heterotropic
• Autotropic
• Phototropic
• Mesotrophic

Solution

Plants which lack chlorophyll cannot carry out photosynthesis. Hence, they depend on heterotrophic mode of nutrition.

Q16. Green plants are

• Saprotrophic
• Symbiotic
• Parasitic
• Autotrophic

Solution

Green plants are autotrophic because they can prepare their own food with the help of sunlight, chlorophyll, water and carbon dioxide.

Q17. Which of the following statements is not true with respect to autotrophic nutrition?

• Food is prepared from simple substances.
• Raw materials like carbon dioxide and water are used.
• Chlorophyll is required for the synthesis of food.
• Autotrophic nutrition does not occur in green plants.

Solution

In autotrophic nutrition, green plants prepare their own food from simple substances like carbon dioxide and water in the presence of sunlight and chlorophyll by a process called photosynthesis.

Q18. Insect-eating plants are called

• Omnivorous plants
• Insectivorous plants
• Herbivorous plants
• Parasitic plants

Solution

Insectivorous plants make their own food but feed on insects to obtain the nitrogen compounds required for their growth.

Q19. Photosynthesis in cactus is carried out by

• Leaves
• Stems
• Spines
• Roots

Solution

Photosynthesis in cactus is carried out by the green stem and green branches of the plant.

Q20. Which of the following correctly represents the word equation for photosynthesis?

• Carbon dioxide + Water → Glucose + Oxygen
• Carbon dioxide + Water → Glucose + Energy
• Oxygen + Water → Starch + Carbon dioxide
• Carbon dioxide + Water → Starch + Oxygen

Solution

Photosynthesis is a process by which green plants make use of carbon dioxide and water to produce food in the form of glucose along with the release of oxygen.

Q21. Fungi are mostly

• Parasitic
• Symbiotic
• Saprotrophic
• Autotrophic

Solution

Fungi are mostly saprotrophic as they derive their food from dead and decaying organic matter.

Q22. Heterotrophic nutrition is seen in (A) Lion, Cat     (B) Algae, Hen (C) Hen, Tiger   (D) Algae, Green plants 

• Only A
• Only C
• Both A and C
• Only D

Solution

Lion, cat, hen and tiger cannot prepare their own food and hence obtain food through heterotrophic mode of nutrition.

Q23. Which of the following does not show symbiotic relationship?

• Alga - Fungus
• Legume - Rhizobium
• Sponge - Alga
• Mosquito - Man

Solution

Mosquito and man share a parasitic relationship wherein the mosquito sucks blood from the human body and obtains nourishment.

Q24. Organisms which stay together for shelter and nutrient are said to be in a 

• Symbiotic relationship
• Parasitic relationship
• Biotic relationship
• Abiotic relationship

Solution

Organisms which stay together for shelter and nutrient are said to be in a symbiotic relationship. Both the organisms live together and help each other to survive.

Q25. Which one of the following is a leguminous plant?

• Pea
• Wheat
• Rice
• Maize

Solution

Pea is a leguminous plant. Leguminous plants have root nodules in them which contain Rhizobium bacteria. These bacteria can convert nitrogen gas present in air into nitrogenous compounds.

Q26. Plants take atmospheric nitrogen from the soil in the form of

• Nitrates
• Ammonia
• Urea
• Nitrogen dioxide

Solution

Plants need nitrogen in the form of water soluble compounds like nitrates.

Q27. The tiny pores present on the surface of leaves are surrounded by

• Guard cells
• Mesophyll cells
• Cork cells
• Parenchyma cells

Solution

The tiny pores called stomata present on the surface of leaves are surrounded by a pair of guard cells.

Q28. The slimy green patches in ponds or other stagnant water bodies are formed due to the growth of

• Algae
• Lichen
• Fungi
• Bacteria

Solution

The slimy green patches in ponds or other stagnant water bodies are formed due to the growth of tiny, green, plant-like organisms called algae.

Q29. Plants are called autotrophs as they

• Can prepare their own food
• Depend on other organisms for food
• Do not have the capacity to prepare food
• Cannot obtain raw materials to prepare food

Solution

Plants are called autotrophs as they can prepare their own food from simple raw materials by the process of photosynthesis.

Q30. The word 'heteros' means

• Self
• Other
• Own
• Independent

Solution

In the term 'heterotrophic', the word 'heteros' means other and 'trophos' means nourishment.

Q31. Which of the following is not a heterotroph?

• Algae
• Yeast
• Cow
• Deer

Solution

Algae are a large group of simple, plant-like organisms which can prepare their own food and hence are classified under autotrophs.

Q32. The mode of nutrition where organisms make food on their own from simple substances is called

• Autotrophic nutrition
• Parasitic nutrition
• Saprotropic nutrition
• Insectivorous nutrition

Solution

The mode of nutrition where organisms make food on their own from simple substances is called autotrophic nutrition.

Q33. Heterotrophic nutrition is seen in (A) Lion, Cat     (B) Algae, Hen (C) Hen, Tiger   (D) Algae, Green plants 

• Only A
• Only C
• Both A and C
• Only D

Solution

Lion, cat, hen and tiger cannot prepare their own food and hence obtain food through heterotrophic mode of nutrition.

Q34. Plants which lack chlorophyll climb on other plants to obtain nourishment. Such plants are called

• Hosts
• Parasites
• Insectivores
• Saprotrophs

Solution

Parasitic plants lack chlorophyll and therefore, climb on other plants to obtain nourishment.

Q35. Which of the following does not provide nutrients to the body?

• Carbohydrates
• Vitamins
• Fats
• Roughage

Solution

Roughage does not provide any nutrient to our body, but is an essential component of our food and adds to its bulk. This helps our body get rid of undigested food.

Q36. Which of the following plants depend on other plants or animals for their food requirements?

• Mushroom
• Rose
• Hibiscus
• Tulsi

Solution

Non-green plants like mushroom, yeast and bread mould do not have chlorophyll to prepare their own food. Therefore, they depend on other plants or animals for their food requirements and hence are called heterotrophs.

Q37. Which of the following statements is not true with respect to heterotrophic modes of nutrition in plants?

• Symbiotic relationship is advantageous for both the organisms.
• Insectivorous plants are also called carnivorous plants.
• Saprophytes have sucking organs which are present externally.
• Parasites may cause harm to the host in the process of obtaining nutrition.

Solution

Saprophytes do not have sucking organs. They secrete digestive juices on the dead and decaying organic matter and convert it into a solution. They absorb the nutrients from this solution.

Q38. Animals are called heterotrophs as they

• Can prepare their own food
• Depend on other organisms for food
• Have capacity to prepare food
• Cannot obtain raw materials to prepare food

Solution

Animals are called heterotrophs as they depend on other organisms for their food requirements.

Q39. The gas released during the process of photosynthesis is

• Nitrogen
• Carbon dioxide
• Carbon monoxide
• Oxygen

Solution

During photosynthesis, plants make use of carbon dioxide gas and release oxygen gas into the atmosphere. This oxygen is utilised by all living organisms for their survival.

Q40. Mushroom plant obtains its nourishment from dead and decaying organic matter. Therefore, it follows

• Mesotrophic nutrition
• Saprotrophic nutrition
• Parasitic nutrition
• Autotrophic nutrition