CBSE 11TH BIOLOGY - Online Test
Q1. Plants complete their life cycle in two phase, saprophytic and gametophytic which occurs alternately called
Answer : Option D
Explaination / Solution:
The multicellular haploid plant structure is called the gametophyte, which is formed from the spore and give rise to the haploid gametes. The fluctuation between these diploid and haploid stages that occurs in plants is called the alternation of generations.
Q2. Bulk flow can be achieved by
Answer : Option C
Explaination / Solution:
Bulk flow can be achieved either through a positive hydrostatic pressure gradient (e.g., a garden hose) or a negative hydrostatic pressure gradient (e.g., suction through a straw).
Q3. Grey spots of Oat are due to deficiency of
Answer : Option C
Explaination / Solution:
Manganese deficiency in Oat appear as grey spots on leaves of oat. Rate of photosynthesis is also influenced by the Manganese elements.
Q4. All are digestive glands except :
Answer : Option A
Explaination / Solution:
Liver, pancrease and salivary gland are digestive gland that release enzymes for digestion of food but thyroid gland release thyroxin hormone that help in metabolism of carbohydrates, proteins and fats.
Q5. The choroid layer in human eye :
i. darkens the cavity of eyeball to prevent internal reflection of light.
ii. its blood vessels nourish the retina.
iii. it regulates shape of eye lens.
i. darkens the cavity of eyeball to prevent internal reflection of light.
ii. its blood vessels nourish the retina.
iii. it regulates shape of eye lens.
Answer : Option A
Explaination / Solution:
The choroid layer in human eye darkens the cavity of eyeball to prevent internal reflection of light. The blood vessels of choroid layer nourish the retina. The shape of eye lens is changed by ciliary muscles.
Q6. The megasporangium of naked seed plants are called
Answer : Option B
Explaination / Solution:
The cones bearing megasporophylls with ovules or megasporangia are called macrosporangiate or female strobili.
Q7. The process of movement of few ions or molecules across the membrane against concentration gradient from higher to lower concentration, it is called
Answer : Option A
Explaination / Solution:
The solutes may move across the membrane by the process of simple diffusion along the concentration gradient, i.e., from higher concentration to the lower.
Q8. The first product of photosynthesis is sugar and it is converted
Answer : Option A
Explaination / Solution:
Photosynthesis is the process by which plants, some bacteria and some protistans use the energy from sunlight to produce glucose from carbon dioxide and water. The glucose is used in respiration, or converted into starch and stored.
Q9.
Name the unlabelled parts of given flow chart :
Answer : Option B
Explaination / Solution:
The flow chart of respiratory mechanism labeled as stretch, expiratory centre and inspiratory centre respiratory. It is controlled by the medulla and pons of hind brain.
Q10. Read the following statements :
i. endocrine system corrects the imbalance originally detected by the nervous system.
ii. nerve cells and endocrine cells exist side by side in adrenal gland and pituitary.
i. endocrine system corrects the imbalance originally detected by the nervous system.
ii. nerve cells and endocrine cells exist side by side in adrenal gland and pituitary.
Answer : Option A
Explaination / Solution:
Endocrine system corrects the imbalance originally detected by the nervous system. Nerve cells and endocrine cells exist side by side in adrenal gland and pituitary gland.
