If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected? [NCERT Exemplar]
1.Proteins breaking down into amino acids
2. Starch breaking down into sugars
3.Fats breaking down into fatty acids and glycerol
4. Absorption of vitamins
Lack of oxygen in muscles often leads to cramps among cricketers. This results due to [NCERT Exemplar]
1. conversion of pyruvate to ethanol
2.conversion of pyruvate to glucose
3. non conversion of glucose to pyruvate
4.conversion of pyruvate to lactic acid
Lipase acts on
1.amino acids
2.fats
3.carbohydrates
4.all of these
The excretory unit of the human excretory system is known as
1.nephridia
2.neuron
3.nephron
4.kidneys
The internal (cellular) energy reserve in autotrophs is [NCERT Exemplar]
1.glycogen
2.protein
3.starch
4.fatty acid
The opening and closing of the stomatal pore depends upon [NCERT Exemplar]
1.oxygen
2.temperature
3.water in guard cells
4. concentration of CO2 in stomata
Which among the following life cycle is exhibited by a rose plant?
1.Haplontic
2.Diplontic
3.Triplontic
4.Haplo-diplontic
A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains [NCERT Exemplar]
1.complex proteins
2. simple proteins
3.fats
4.starch
A student performs an experiment using a Balsam plant with intact stem, leaves, roots and flowers. The plant was kept in a test tube containing eosin solution (a pink colour dye). The test tube mouth was covered using cotton plug as shown. The student kept the plant undisturbed in the lab. After 2-3 hours, a transverse section of stem was obtained using sharp scissors and studied under microscope. The studies reveal the presence of pink colour in the vessels of xylem. What does this observation explain?
1.Most portion of the plant stem is occupied by xylem.
2. Water moves through xylem in the plant.
3.Eosin solution gets stored in the xylem.
4. Xylem reacts with eosin and gives colour.
A student sets up an experiment to study human respiration using lime water, test tube and a straw. Lime water is colourless in the absence of CO2 and is milky in its presence. The student fills a freshly prepared limewater in a test tube and blows air through straw into the limewater. It was observed that the solution turns cloudy as shown. What can be evaluated from this observation?
1.Oxygen is exhaled during respiration.
2.Water vapours are produced during respiration.
3.Carbon dioxide is exhaled during respiration.
4.Glucose is produced during respiration.
A student sets up an experiment to study the role of enzymes in digestion of food. In which test tube, the digestion of protein will occur?
1. Test tubes A as pepsin will breakdown protein into simple molecules.
2.Test tube B as HCl will breakdown protein into simple molecules.
3.Test tube A as pepsin will breakdown into simple molecules.
4.Test tube B as HCl will activate pepsin for breakdown of protein into simple molecules.
Among the following choose the correct option which includes the organisms that have a holozoic mode of nutrition:
1.Plasmodium and Amoeba
2. Parakeet and Amoeba
3.Paramecium and Plasmodium
4.Paramecium and Parasite
Blood consist of what fluid medium?
1.Lymph
2.Platelets
3.Plasma
4.All of these
Blood from superior vena cava flows into
1.right atrium
2. right ventricle
3.left atrium
4.left ventricle
Choose the correct path of urine in our body. [NCERT Exemplar]
1.Kidney ?ureter ?urethra ?urinary bladder
2.Kidney ?urinary bladder ?urethra ?ureter
3.Kidney ?ureter ?urinary bladder ?urethra
4.Urinary bladder ?kidney ?ureter ?urethra
During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the [NCERT Exemplar]
1.cytoplasm
2.chloroplast
3.mitochondria
4. golgi body
During respiration exchange of gases take place in
1.trachea and larynx
2.alveoli of lungs
3. alveoli and throat
4. throat and larynx
In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body? [NCERT Exemplar]
1.Pisces and amphibians
2.Amphibians and reptiles
3.Amphibians only
4.Pisces only
In which part of the alimentary canal food is finally digested? [NCERT Exemplar]
1.Stomach
2. Mouth cavity
3.Large intestine
4.Small intestine
Movement of the synthesized products from the leaves to the roots and other parts of a plant’s body takes place through the phloem. This process is known as
1.translocation
2.transpiration
3.transportation
4.excretion
Plants use the energy stored in ATP to accomplish the process of transportation of
1.water and minerals
2.oxygen
3.water, minerals and food
4.food
Raw materials required in the autotrophic mode of nutrition involves: (i) Carbon dioxide and water (ii) Chlorophyll (iii) Nitrogen (iv) Sunlight
1.(i), (ii) and (iii)
2.(i) and (ii)
3.(i), (ii) and (iv)
4.All (i), (ii), (iii) and (iv)
Rings of cartilage present in the throat ensure that
1. air is filtered
2. air is at room temperature
3. air passage does not collapse
4.air is free of microbes
Single circulation, i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by [NCERT Exemplar]
1.Labeo, Chameleon, Salamander
2. Hippocampus, Exocoetus, Anabas
3. Hyla, Rana, Draco
4.Whale, Dolphin, Turtle
Sometimes we get painful cramps in our leg muscles after running for a long time due to the accumulation of
1.hydrochloric acid
2.fat
3.carbon dioxide
4.lactic acid
The enzymes in pancreatic juice help in the digestion of
1.fats and carbohydrates
2.proteins and fats
3.proteins and carbohydrates
4.proteins, fats and carbohydrates
The enzymes pepsin and trypsin are secreted respectively by
1. stomach and pancreas
2. salivary gland and stomach
3.liver and pancreas
4.liver and salivary gland
The green colour of plants is due to the presence of
1.chlorophyll
2.carotene
3.xanthophyll
4.starch
The image shows oxygenated and de-oxygenated blood in the human heart. What is the direction of deoxygenated blood from right ventricle of the heart?
1.towards the lungs.
2.towards the left atrium of heart.
3. towards the upper body.
4.towards the lower body.
The image shows the bread moulds on a bread. How these fungi obtain nutrition?
1. By using nutrients from the bread to prepare their own food.
2.By allowing other organisms to grow on the bread and then consuming them.
3.By breaking down the nutrients of bread and then absorbing them.
4. By eating the bread on which it is growing.
The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one.
1.Pepsin
2.Mucus
3.Salivary amylase
4.Bile
The process by which Amoeba obtains food is called
1.phagocytosis
2. assimilation
3.diffusion
4.absorption
The vein which brings clean blood from the lungs into the heart is known as
1.pulmonary vein
2. hepatic vein
3.superior vena cava
4.pulmonary artery
When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of [NCERT Exemplar]
1.oxygen
2.carbon dioxide
3.nitrogen
4.water vapour
Which among the following is incorrect about diplontic life cycle?
1. Sporophyte is the dominant phase
2.All spermatophytes exhibit diplontic life cycle
3. Gametophyte depends on the sporophyte
4.Sporophyte depends on Gametophyte for their food
Which among the following is incorrect about Haplo-diplontic life cycle?
1.In this life cycle, both sporophytic phase and gametophytic phase have equal life time
2. Both sporophytic and gametophytic phases are multi-cellular and have independent existence
3.This kind of life cycle is exhibited by Pteridophytes and Bryophyte
4.Ectocarpus exhibits haplo-diplontic life cycle
Which among the following is incorrect?
1.In bryophytes, haploid gametophyte is the dominant phase
2.In Volvox, haploid gametophyte is the dominant phase
3.In Spirogyra, diploid Sporophyte is the dominant phase
4. In Pappaya, haploid gametophyte is the dominant phase
Which among the following life cycle is exhibited by Fucus?
1.Diplontic
2.Haplontic
3.Triplolntic
4.Haplo-diplontic
Which among the following life cycle is exhibited by Polysiphonia?
1.Diplontic
2.Haplontic
3.Triplolntic
4.Haplo-diplontic
Which among the following life cycle suits Chlamydomanas?
1.Haplontic
2.Diplontic
3.Triplontic
4.Haplo-diplontic
Which among the following procedures is used for cleaning the blood of a person by separating the waste substance from it?
1. Kidney transplant
2. Blood transfusion
3.Dialysis
4.Hydrolysis
Which is the correct sequence of parts in human alimentary canal? [NCERT Exemplar]
1.Mouth ?stomach ?small intestine ?oesophagus ?large intestine
2.Mouth ?oesophagus ?stomach ?large intestine ?small intestine
3.Mouth ?stomach ?oesophagus ?small intestine ?large intestine
4.Mouth ?oesophagus ?stomach ?small intestine ?large intestine
Which is the first enzyme to mix with food in the digestive tract? [NCERT Exemplar]
1.Pepsin
2.Cellulase
3.Amylase
4.Trypsin
Which of the following help in protecting the inner lining of the stomach from the harmful effect of hydrochloric acid?
1.Mucus
2.Pepsin
3.Trypsin
4.Bile
Which of the following is incorrect about haplontic life cycle?
1.Gametophytes are the dominant phase in this life cycle
2. Sporophytes are free-living
3.Spores are haploid in nature and form gametophyte by mitotic division
4.Zygote acts as sporophyte
Which of the following organisms absorbs nutrition with haustoria?
1.A carnivore
2. A herbivore
3. A parasite
4.A saprophyte