Download App

Plant Water Relation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Water Relation1 Mark
MCQ
Guard cells are surrounded by ……………..
  • A
    epidermal hairs
  • B
    mesophyll cells
  • ✓
    accessory cells
  • D
    lenticels
✓

Answer

Correct option: C.
accessory cells
accessory cells

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Plant Water Relation→Plant Water Relation — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

Which of the following types require pollination but result is genetically similar to autogamy?
→
Which is adverse effect of sanitary land fill noticed occasionally?
→
Which one is a hereditary disease?
→
Based on location, plants have these three types of meristems.
→
The common Nitrogen$-$fixer in paddy fields is
→
……………… is formed in angiosperms by triple fusion.
→
Read the following and answer any four questions from $(i)$ to $(v)$ given below:
Crown gall is a neoplastic disease of most dicotyledonous plants and is caused by the soil bacterium Agrobacterium tumefaciens. A large extra chromosomal plasmid in these bacteria was found to be responsible for this disease. The plasmid is known as $Ti$ plasmid. Bacteria free crown gall cells can be cultured in the absence of phytohormones. $Ti$ plasmid is widely used in genetic engineering to deliver the desirable genes. The part of Ti plasmid transferred into plant cell $\text{DNA}$ is called $T-\text{DNA}. T-\text{DNA}$ with desired $\text{DNA}$ segment is inserted into the chromosome of the host plant where it produces copies of itself.
  1. Which of the following is the full full of $T- \text{DNA}$?
  1. Transfer $\text{DNA}$.
  2. Tumour inducing $\text{DNA}$.
  3. Transgenic $\text{DNA}$.
  4. None of these.
  1. Ti plasmid cannot infect and develop crown gall in,
  1. Tomato.
  2. Maize.
  3. Soybean.
  4. sunflower.
  1. While making transgenic plant, $T- \text{DNA}$ is inserted into the host cell, it is then:
  1. Integrated into the target host genome.
  2. Lie independent of the host genome.
  3. Rupture the host cell wall.
  4. Produce oncogenic factors in the host.
  1. Agrobacterium mediated gene transfer in plants:
  1. Allows relatively large segment of $\text{DNA}$.
  2. Transfer of $\text{DNA}$ with defined ends and minimal rearrangement.
  3. High quality and fertility in transgenic plants.
  4. All of these.
  1. Assertion : In Agrobacterium mediated gene transfer in plants, transgenic plants do not develop tumors.
Reason : In $T- \text{DNA}$ tumor producing genes are deleted during the process of gene transfer.
  1. Both assertion and reason are true and reason is the correct explanation of assertion.
  2. Both assertion and reason are true but reason is not the correct explanation of assertion.
  3. Assertion is true but reason is false.
  4. Both assertion and reason are false.
→
Cyclosporin a is used for:
→
In vitro pollen germination and pollen tube elongation can be induced by ______.
→
To isolate protoplast, one needs.
→